RESULTS. There were 27 patients (14 male, 13 female) with a mean age of 62 (range, 44-77) years. There were 10 patients with renal transplants; their native renal arteries were not evaluated. Each of the two experienced interventional and body magnetic resonance radiologists, who were blinded to the results, reviewed the digital subtraction angiography and magnetic resonance angiography images respectively. Digital subtraction angiography was used as the standard of reference. A total of 39 renal arteries from these 27 patients were evaluated. One of the arteries was previously stented and could not be assessed with magnetic resonance angiography due to severe artefacts. Of the remaining 38 renal arteries, two were graded as normal, seven as having mild stenosis (=50% but =75%). Magnetic resonance angiography and digital subtraction angiography were concordant in 89% of the arteries; magnetic resonance angiography overestimated the degree of stenosis in 8% and underestimated it in 3% of them. In ...

A dynamic MR angiography technique, MR digital subtraction angiography (MR DSA), is proposed using fast acquisition, contrast enhancement, and complex subtraction. When a bolus of contrast is injected into a patient, data acquisition begins, dynamically acquiring a thick slab using a fast gradient e …

BACKGROUND AND PURPOSE: Contrast-enhanced MR angiography and extracranial color-coded duplex sonography are noninvasive, preoperative imaging modalities for evaluation of carotid artery stenosis. Innovative techniques and improvements in image quality require frequent reassessment of accuracy, reliability, and diagnostic value compared with those of digital subtraction angiography (DSA). We evaluated contrast-enhanced MR angiography and duplex sonography compared with DSA for detection of high-grade carotid artery stenoses. METHODS: Four readers, blinded to clinical symptoms and the outcome of other studies, independently evaluated stenoses on contrast-enhanced MR angiograms in 71 vessels of 39 symptomatic patients. Duplex sonography was also performed in all vessels. The severity of stenosis was defined according to North American Symptomatic Carotid Endarterectomy Trial criteria (0-29%, 30-69%, 70-99%, 100%). Results of both modalities were compared with the corresponding DSA finding

TY - JOUR. T1 - Peripheral vascular disease. T2 - Blinded study of dedicated calf MR angiography versus standard bolus-chase MR angiography and film hard-copy angiography. AU - Binkert, Christoph A.. AU - Baker, Phillip D.. AU - Petersen, Bryan D.. AU - Szumowski, Jerzy. AU - Kaufman, John A.. PY - 2004/9/1. Y1 - 2004/9/1. N2 - PURPOSE: To compare the accuracy of contrast material-enhanced three-dimensional (3D) dedicated calf magnetic resonance (MR) angiography with that of bolus-chase MR angiography, with conventional angiography as the reference standard, in patients with symptomatic peripheral vascular disease (PVD). MATERIALS AND METHODS: Thirty men with symptomatic PVD were examined. MR angiography was performed at 1.5 T before conventional angiography. MR angiographic examination included 3D contrast-enhanced dedicated calf MR angiography and three-station bolus-chase MR angiography. Two radiologists blinded to conventional angiographic results evaluated the MR angiograms independently. ...

TY - JOUR. T1 - Noninvasive determination of infarct artery patency by cine magnetic resonance angiography. AU - Hundley, W. G.. AU - Clarke, G. D.. AU - Landau, C.. AU - Lange, R. A.. AU - Willard, J. E.. AU - Hillis, L. D.. AU - Peshock, R. M.. PY - 1995. Y1 - 1995. N2 - Background: In survivors of myocardial infarction, restoration of antegrade flow in the infarct artery reduces morbidity and mortality. At present, coronary artery patency must be assessed invasively with contrast angiography. A noninvasive method of evaluating infarct artery patency would be useful in managing survivors of infarction. This study was performed to determine whether magnetic resonance (MR) imaging could reliably assess infarct artery patency in this patient population. Methods and Results: Eighteen survivors of myocardial infarction (11 men and 7 women, aged 35 to 74 years) who were consecutively referred for cardiac catheterization underwent contrast coronary angiography and cine MR coronary angiography. ...

TY - JOUR. T1 - Quantitative analysis of 1.5-T whole-heart coronary MR angiograms obtained with 32-Channel cardiac coils. T2 - A comparison with conventional quantitative coronary angiography. AU - Yonezawa, Masato. AU - Nagata, Motonori. AU - Kitagawa, Kakuya. AU - Kato, Shingo. AU - Yoon, Yeonyee. AU - Nakajima, Hiroshi. AU - Nakamori, Shiro. AU - Sakuma, Hajime. AU - Hatakenaka, Masamitsu. AU - Honda, Hiroshi. N1 - Copyright: Copyright 2014 Elsevier B.V., All rights reserved.. PY - 2014/5. Y1 - 2014/5. N2 - Purpose: To develop a method to determine significant stenosis at wholeheart coronary magnetic resonance (MR) angiography and to evaluate the accuracy and reproducibility of this approach. Materials and Methods: The institutional review board approved the study, and all participants provided written informed consent. Sixty-two patients who were suspected of having coronary artery disease (CAD) and were scheduled for conventional coronary angiography were included. Coronary MR angiography ...

TY - JOUR. T1 - Noninvasive coronary artery imaging. T2 - Magnetic resonance angiography and multidetector computed tomography angiography: A scientific statement from the American Heart Association committee on cardiovascular imaging and intervention of the council on cardiovascular radiology and intervention, and the councils on clinical cardiology and cardiovascular disease in the young. AU - Bluemke, David A.. AU - Achenbach, Stephan. AU - Budoff, Matthew. AU - Gerber, Thomas C.. AU - Gersh, Bernard. AU - Hillis, L. David. AU - Hundley, W. Gregory. AU - Manning, Warren J.. AU - Printz, Beth Feller. AU - Stuber, Matthias. AU - Woodard, Pamela K.. PY - 2008/7/29. Y1 - 2008/7/29. KW - AHA scientific statements. KW - Angiography. KW - Imaging. UR - http://www.scopus.com/inward/record.url?scp=49649104098&partnerID=8YFLogxK. UR - http://www.scopus.com/inward/citedby.url?scp=49649104098&partnerID=8YFLogxK. U2 - 10.1161/CIRCULATIONAHA.108.189695. DO - 10.1161/CIRCULATIONAHA.108.189695. M3 - Review ...

TY - JOUR. T1 - Contrast-enhanced MR angiography for evaluation of vascular complications of the pancreatic transplant. AU - Dobos, Nora. AU - Roberts, David A.. AU - Insko, Erik K.. AU - Siegelman, Evan S.. AU - Naji, Ali. AU - Markmann, James F.. PY - 2005/5. Y1 - 2005/5. N2 - Vascular complications are a common cause of postoperative dysfunction in a pancreatic transplant. Coronal three-dimensional (3D) contrast material-enhanced magnetic resonance (MR) angiography performed with high spatial and temporal resolution is a safe and effective method of assessing these vascular complications. A study was performed of selected patients who had undergone MR imaging and MR angiography during the past 6 years for evaluation of graft dysfunction following pancreatic transplantation. Thrombosis within peripheral stump vessels involving either the arterial or venous segments was a commonly observed vascular complication. Isolated distal arterial stump thrombi are incidental findings that may not require ...

TY - JOUR. T1 - Magnetic resonance angiography in vertebrobasilar ischemia. AU - Verro, Piero. AU - Levine, R. L.. AU - Turski, P. A.. AU - Partington, C.. PY - 1993. Y1 - 1993. UR - http://www.scopus.com/inward/record.url?scp=0027516360&partnerID=8YFLogxK. UR - http://www.scopus.com/inward/citedby.url?scp=0027516360&partnerID=8YFLogxK. M3 - Article. C2 - 10148530. AN - SCOPUS:0027516360. VL - 3. SP - 132. EP - 138. JO - Journal of Neuroimaging. JF - Journal of Neuroimaging. SN - 1051-2284. IS - 2. ER - ...

Introduction: Contrast-enhanced MR angiography (CE-MRA) provides highly accurate measurement of carotid stenosis. But non-contrast techniques are desired as contrast agents may lead to anaphylaxis or nephrogenic system fibrosis. Recently, an inversion-recovery gradient echo sequence with phase-sensitive reconstruction was developed for assessment of lumen and intraplaque hemorrhage in one sequence - Simultaneous Noncontrast Angiography and intraPlaque hemorrhage (SNAP).. Hypothesis: We tested the hypothesis that SNAP provides an accurate and reproducible assessment of carotid stenosis compared to CE-MRA.. Methods: Fifty-eight subjects with 16-79% stenosis on ultrasound were scanned using a large-coverage (16 cm), isotropic-resolution (0.8 mm) SNAP sequence. Minimum intensity projections were generated at ten degrees increments to get 3D views of carotid arteries. Carotid stenosis was measured bilaterally according to the NASCET criteria by independent readers to estimate inter-reader ...

Conventional coronary angiography frequently underestimates the true burden of atherosclerosis. As reported by Glagov et al,1 the initial response to endothelial injury and development of atherosclerosis is vessel enlargement, with relative preservation of lumen diameter. Subsequent plaque progression, with lumen-encroachment stenoses, is a later event. Invasive x-ray coronary angiography and bright-blood2 3 coronary magnetic resonance angiography (MRA) only allow for assessment of luminal vessel diameter and do not provide direct information regarding coronary vessel wall thickness or atherosclerotic plaque. Recent intravascular ultrasound (IVUS) studies4 5 have shown that lesion-site cross-sectional area, minimum lesion diameter, cross-sectional narrowing, and area stenosis are good predictors for subsequent acute cardiac events. However, this invasive technique is not appropriate for screening or serial examinations. Apart from plaque burden and luminal encroachment, plaque composition is a ...

In many preliminary and feasibility studies, various contrast-enhanced MR angiorgaphic techniques have been implemented in the assessment of extracranial disease of the carotid artery. Different strategies are used to optimize image quality, including time-resolved and high-resolution techniques. Most of these reports, although based on small numbers of patients, suggest that contrast-enhanced MR angiography could become a diagnostic alternative as a fast, first screening method in patients suspected of having carotid artery disease, independently from the technique employed in the study.. DSA is still considered to be the criterion standard for imaging of arteriosclerotic supraaortic vessel disease. Harboring the risks of thromboembolic events, this technique can reduce the overall benefit of endarterectomy. Noninvasive techniques for imaging supraaortic vessels prevent this risk related to the diagnostic procedure and can be regarded as a safe alternative to DSA whenever possible.. We chose to ...

BACKGROUND: Magnetic resonance (MR)-guided vascular interventions are of increasing interest, and, with the use of contrast-enhanced techniques, intraarterial contrast-enhanced MR angiography (ia-ce-MRA) competes with intraarterial digital subtraction angiography (ia-DSA) for the diagnostic evaluation of the infrainguinal vessel tree. PURPOSE: To assess the diagnostic value of ia-ce-MRA and high-resolution T1-weighted (hr-T1w) imaging compared to the gold-standard ia-DSA for residual stenosis and local dissections after femoropopliteal recanalization in patients with peripheral arterial occlusive disease (PAOD). MATERIAL AND METHODS: Eight patients with PAOD and short vessel occlusion of their femoropopliteal arteries underwent recanalization and balloon positioning under DSA. Patients were transferred to a short-bore MR scanner. Percutaneous transluminal angioplasty (PTA) was accomplished under MR fluoroscopy. Pre- and postinterventional ia-ce three-dimensional (3D) gradient-echo MRA with ...

TY - JOUR. T1 - The role of infrapopliteal MR angiography in patients undergoing optimal contrast angiography for chronic limb-threatening ischemia. AU - Leyendecker, John R.. AU - Elsass, Kelcey D.. AU - Johnson, Stephen P.. AU - Diffin, Daniel C.. AU - Cull, David L.. AU - Light, Jerry T.. AU - Dawson, David L.. N1 - Copyright: Copyright 2017 Elsevier B.V., All rights reserved.. PY - 1998. Y1 - 1998. N2 - PURPOSE: To determine the benefit of infrapopliteal magnetic resonance angiography (MRA) in patients with chronic limb-threatening ischemia who have undergone optimal contrast angiography (CA). PATIENTS AND METHODS: Thirty- four patients (37 limbs) with limb-threatening chronic lower extremity ischemia underwent MRA and CA of the symptomatic extremity. Selective, vasodilator-enhanced digital subtraction angiography of the infrapopliteal vessels was possible for 34 limbs. Two vascular surgeons retrospectively formulated treatment plans based on CA. They then formulated treatment plans based on ...

TY - JOUR. T1 - Thoracic aorta. T2 - Comparison of single-dose breath-hold and double-dose non-breath-hold gadolinium-enhanced three-dimensional MR angiography. AU - Krinsky, Glenn A.. AU - Reuss, Peter M.. AU - Lee, Vivian S.. AU - Carbognin, Giovanni. AU - Rofsky, Neil M.. PY - 1999/7. Y1 - 1999/7. N2 - OBJECTIVE. The purpose of this study was to compare single-dose (0.1 mmol/kg) breath-hold gadolinium-enhanced three-dimensional (3D) MR angiography and double-dose (0.2 mmol/kg) non-breath-hold 3D MR angiography for evaluation of thoracic aortic disease. MATERIALS AND METHODS. Twenty- five patients referred for MR evaluation of the thoracic aorta underwent non- breath-hold gadolinium-enhanced 3D MR angiography on a 1.5-T scanner with standard gradients (TR/TE, 21/6; flip angle, 30°) during slow infusion of a double dose of gadopentetate dimeglumine using a body coil. Subsequently, the same patients underwent breath-hold MR imaging with high-performance gradients (TR/TE, 5/2; flip angle, ...

The authors compared the three-dimensional Fourier transform (3DFT) time-of-flight magnetic resonance (MR) angiograms in 38 patients initially studied with selective intraarterial digital subtraction angiography (DSA) for suspected arteriosclerotic disease of the carotid bifurcation. MR angiograms w …

Transcatheter arterial chemo-embolization (TACE) is a therapeutic procedure to treat primary and metastatic liver cancer. It requires prior delineation of the hepatic arteries on magnetic resonance angiography (MRA) data and identification of the vessels supplying the tumor. Manual segmentation is extremely challenging and time consuming, thereby increasing the risk of wrongfully identifying the feeding vessels. We present a vascular path planning tool for TACE procedures by automatically segmenting the hepatic arteries on MRA. The proposed method first detects the celiac trunk from the aorta, then localizes and tags bifurcations throughout the arterial network for path planning. The algorithm is based on a multiple hypothesis tracking approach used to propagate deformable mesh surfaces. We validated the proposed framework on 20 liver-cancer-patients using abdominal MRA with 20 seconds delay after contrast injection. We show that the algorithm improves the selectivity of the arterial segments ...

Focal damage to the fornices is uncommon and may be due to surgical removal of ventricular cysts and tumours.1 We report a case of bilateral fornix infarction with reduced fractional anisotropy values at 3 T after anterior communicating artery aneurysm clipping.. A healthy 33-year-old woman was admitted to our hospital with the incidental finding of an anterior communicating artery (ACoA) aneurysm on magnetic resonance angiography. Neurological examination was normal. Digital subtraction angiography visualised a broad based, tapered and 4 mm sized aneurysm of the ACoA and a median callosal artery (fig 1C). The ACoA aneurysm was treated with surgical clipping because of its irregular configuration. After surgery, the patient was drowsy with fluctuating impaired vigilance. She was disoriented in time, space and person, and revealed anterograde amnesia and amnesic aphasia. Her relatives noticed personality changes, psychomotor slowing and decreased spontaneity of speech and behaviour. Apart from ...

TY - GEN. T1 - VIDEO REQUIREMENTS FOR DIGITAL SUBTRACTION ANGIOGRAPHY.. AU - Hines, Horace H.. AU - Seibert, J Anthony. AU - Borger, David J.. PY - 1984. Y1 - 1984. N2 - The television camera comprises an important link in the imaging chain of digital subtraction angiography equipment. Various factors including spatial resolution, signal to noise ratio (SNR), progressive and interlaced read out, exposure utilization and camera lag are investigated. Requirements for the video camera for optimized DSA studies include sufficient bandpass to satisfy digitization matrix sizes, an 800:1 camera SNR, progressive read out of the camera target, and bias light to minimize build-up lag response.. AB - The television camera comprises an important link in the imaging chain of digital subtraction angiography equipment. Various factors including spatial resolution, signal to noise ratio (SNR), progressive and interlaced read out, exposure utilization and camera lag are investigated. Requirements for the video ...

Get Digital Subtraction Angiography cost from certified hospitals in Bangalore. Get assistance from medical experts to select best hospital for Digital Subtraction Angiography in Bangalore

I had a stroke back in early 2005. With that, and with my moms death, my neurologist recommended that I have an MRA done of my head. I had that done at the clinic today. The neurologist also wants me to get my homocystine levels checked to make sure my medications are still working. In addition, I saw my cardiologist earlier this week and she wants me to have my choloestrol checked. So, Im going to get blood work done at LabCorp on Friday ...

View details of top cerebral digital subtraction angiography dsa hospitals in Mumbai. Get guidance from medical experts to select best cerebral digital subtraction angiography dsa hospital in Mumbai

Grey-scale and Doppler ultrasound (US) are alternative modalities to diagnose soft-tissue vascular anomalies [16]. However, US has only a limited ability to display the full extent of large lesions and to demonstrate an intra-osseous component [17,18]. Some MRI techniques have been used for classification of peripheral vascular lesions [18,19,20]. Time-of-flight MR angiography can show feeding arteries with high-flow; however, this modality has a limitation regarding smaller vessels [19]. A previous study by van Rijswijk et al. [20] has demonstrated that with the use of the dynamic contrast-enhancement gradient-echo technique, venous malformations were distinguished from non-venous malformations with high specificity. Another study has demonstrated that time-resolved MR projection angiography was useful for the separation of high- and low-flow vascular malformations [18]. Although direct puncture venography is useful for the diagnosis of VMs and also for confirming lymphatic fluid leaks to ...

Coronary artery disease (CAD) is the leading cause of death in the United States. CAD is implicated in 900,000 deaths per year 1.5 million heart attacks occur each year estimated yearly cost of care for patients with CAD is $60 billion dollars More than 1 million cardiac catheterizations are performed each year cardiac catherization is used to define coronary artery anatomy, and also to guide therapy for cardiac patients X-ray coronary angiography is associated with significant radiation exposure and a small risk (1.7%) of serious complications estimated per-patient cost of cardiac catherization is $3000-$5000 Cardiac catheterization has diagnostic limitations X-ray angiography provides little information regarding coronary artery blood flow, and does not address the functional significance of coronary lesions

Purpose: To evaluate the suitability of an improved version of an automatic segmentation method based on geodesic active regions (GAR) for segmenting cerebral vasculature with aneurysms from 3D X-ray reconstruc-tion angiography (3DRA) and time of °ight magnetic resonance angiography (TOF-MRA) images available in the clinical routine.Methods: Three aspects of the GAR method have been improved: execution time, robustness to variability in imaging protocols and robustness to variability in image spatial resolutions. The improved GAR was retrospectively evaluated on images from patients containing intracranial aneurysms in the area of the Circle of Willis and imaged with two modalities: 3DRA and TOF-MRA. Images were obtained from two clinical centers, each using di®erent imaging equipment. Evaluation included qualitative and quantitative analyses ofthe segmentation results on 20 images from 10 patients. The gold standard was built from 660 cross-sections (33 per image) of vessels and aneurysms, ...

MR Angiography (MRA) is an MRI scan that provides pictures of blood vessels inside the body. These tests are used to diagnose blockages, aneurysms, and narrowing of blood vessels. Unlike traditional angiograms, which require an arterial catheter to be placed, MR angiography is completely non-invasive. If you are receiving an IV Contrast MRA, you will be injected with a contrast solution to make images appear brighter on the screen.. MRI doesnt use harmful radiation to create images. Instead, strong magnetic fields and radiofrequency waves (the same kind used in radio transmissions) are used to create images of the body. No harmful side effects have ever been reported from MRI. ...

We tested the hypothesis that differences in proximal and distal contrast bolus arrival times may result in insufficient vascular signal in the distal part of the aortoiliofemoral territory with routinely used timing techniques. The difference in arrival time of the contrast medium bolus between the aorta and the common femoral arteries was measured in 14 patients undergoing magnetic resonance angiography of the aortoiliac arteries. A dual-station test bolus technique adjusting for this difference was evaluated. The variation coefficient of the signal intensity in six defined locations and signal intensities (SI) normalised to fat were calculated. Comparisons were made with findings in 13 patients examined with a fluoroscopically triggered timing technique (BolusTrak, Philips Medical Systems, Best, The Netherlands). The difference in bolus arrival time between proximal and distal vessels was 0-7 s. In 3 of 14 patients it was 5.6-7 s. There was a tendency towards a lower mean variation ...

Currently, the majority of patients with known or suspected BVMs undergo noninvasive evaluation with conventional MRI or MR angiography, which can reliably differentiate between a typical nontreated arteriovenous malformation (AVM) and a typical developmental venous anomaly with its pathognomonic medusa-head appearance from radially oriented small veins converging to a central draining vein. However, the performance of conventional MRI and MR angiographic examinations in the follow-up of patients with treated AVMs and dural arteriovenous fistulas is often suboptimal.4-7 Indeed, conventional MR angiographic studies may continue to show dilated draining veins or enlarged arteries in previously treated AVMs even in the absence of AVS, because the vessel caliber changes often take time to reverse after elimination of AVS.8 Likewise, there is often contrast enhancement in the region of the treated AVM nidus secondary to reactive gliosis.7. Additionally, it is often difficult to differentiate ...

With Philips Digital Subtraction Angiography (DSA) automatic examination pre-sets support a smooth and efficient workflow in angiography examinations.

Animal models offer a flexible experimental environment for studying atherosclerosis. The mouse is the most commonly used animal, however, the underlying hemodynamics in larger animals such as the rabbit are far closer to that of humans. The aortic arch is a vessel with complex helical flow and highly heterogeneous shear stress patterns which may influence where atherosclerotic lesions form. A better understanding of intraspecies flow variation and the impact of geometry on flow may improve our understanding of where disease forms. In this work, we use magnetic resonance angiography (MRA) and 4D phase contrast magnetic resonance imaging (PC-MRI) to image and measure blood velocity in the rabbit aortic arch. Measured flow rates from the PC-MRI were used as boundary conditions in computational fluid dynamics (CFD) models of the arches. Helical flow, cross flow index (CFI), and time-averaged wall shear stress (TAWSS) were determined from the simulated flow field. Both traditional geometric metrics ...

Millimeter measurements are needed for management decisions and treatment planning of some vascular diseases. Surveying 2 recent issues of the American Journal of Neuroradiology gleaned reports requiring millimeter measurements from digital subtraction angiography (DSA).1-4 These included aneurysm sizes, necks, and devices matched to artery size.. Despite the multiple advantages of DSA, the technology did not, and still does not, include a method of measurement that provides the same ability to measure in millimeters as earlier analog techniques did. C-arm DSA with adjustable intensifiers reduces tube distance and thus increases magnification. Intensifier positional variability and tabletop movements add to millimeter inaccuracy with variable magnification in different projections.5 FOV settings further complicate calibrations. There are challenges to calibrating real millimeters with different positions when scanning the same patient. Manufacturers did not develop millimeter adjustments for ...

Ratering, D; Baltes, C; Lohmann, C; Matter, C M; Rudin, M (2011). Accurate assessment of carotid artery stenosis in atherosclerotic mice using accelerated high-resolution 3D magnetic resonance angiography. Magma, 24(1):9-18.. Baltes, C; Bosshard, S; Mueggler, T; Ratering, D; Rudin, M (2011). Increased blood oxygen level-dependent (BOLD) sensitivity in the mouse somatosensory cortex during electrical forepaw stimulation using a cryogenic radiofrequency probe. NMR in Biomedicine, 24(4):439-446.. Ratering, D. Improving sensitivity per unit time in small animal MRI: Low temperature detection and parallel acquisition. 2010, ETHZ Diss.No 18954, Faculty of Medicine.. Yankam Njiwa, J; Ratering, D; Baltes, C; Rudin, M (2010). Increasing temporal resolution of DSC perfusion MRI using the analytic image concept. Magma, 23(4):251-261.. Ratering, D; Baltes, C; Nordmeyer-Massner, J A; Marek, D; Rudin, M (2008). Performance of a 200-MHz cryogenic RF probe designed for MRI and MRS of the murine brain. Magnetic ...

The digital subtraction angiography method useful for three dimensional (3D) imaging of a selected volume of a body comprises the following steps. Acquiring first and second 3D data sets representative of an image of substantially the same selected volume in the body, the first and second data sets being acquired at different times corresponding to a pre- and a post injection of a contrast medium, respectively. Determining common reference points for spatially corresponding subvolumes in the data sets. Comparing in a 3D spatial manner data in subvolumes of the second data set with data in corresponding subvolumes in the first data set in order to determine a new reference point in each of the subvolumes of the first data set which results in a best match of the spatial similarity of the data in the corresponding subvolumes of the second data set. Spatially interpolating new data for the subvolumes of said first data set using the new reference points determined above and the originally acquired

MRIs are used to scan and examine one part of your body at a time. The scan can focus on many parts of the anatomy. There is even a form of MRI that can look at blood vessels and the flow of the blood as it goes through them. This is called Magnetic Resonance Angiography (MRA). These kinds of scans can help to find arterial and vein problems, such as a blocked vessel, torn vessel lining or aneurysm. The different kinds of MRI scans include, but are not limited to: Abdomen, Adrenal Glands, Ankle (Achilles), Bladder, Brain, Breast, Cervical Spine (C-Spine), Chest, Coccyx (Tailbone), Elbow, Face (Maxillofacial, Parotid Glands), Femur (Thigh, Upper Leg), Fingers, Foot, Forearm (Lower Arm), Hand, Hip, Humerus (Upper Arm), IACs (Inner Ear), Kidneys (Renal, Knee, Liver, Lower Leg (Calf, Tibia, Fibula), Lumbar Spine (L-Spine), Mandible (Jaw), MRA Abdomen (Abdominal Aorta), MRA Brain, MRA Chest, MRA Kidneys, MRA Knee, MRA Neck, Nasopharynx (Tongue), Neck, Orbits (Ears), Pancreas, Pelvis, Pituitary ...

Magnetic resonance perfusion imaging in glioblastoma Indications Magnetic resonance perfusion imaging, may: Provide a noninvasive diagnostic tool for properly grading lesions. Identifying the most malignant region of a tumor for guiding biopsy Monitoring response to therapy that may precede conventionally assessed changes in tumor morphology and enhancement characteristics.

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A 39-year-old man with no known cardiovascular risk factors was hospitalized for chest pain radiating to the side. Type A aortic dissection was diagnosed by transthoracic echocardiography and computed tomography (CT). Urgent surgery was performed, in which the ascending aorta was replaced with a valved tube graft (Bentall-Bono procedure). The patient had a phenotype typical of Marfan disease: height of 190 cm, long limbs, scoliosis and dural ectasia.. Postoperative follow-up included yearly imaging studies with transthoracic echocardiography and magnetic resonance angiography of the aorta. Two years later, after the aorta had reached a diameter of 59 mm in the curve distal to the origin of the supra-aortic trunks (Figure 1), a second operation, consisting of an elephant trunk technique (Figure 2) with on-pump circulation and retrograde cerebral perfusion was performed to repair the arch. The patient was thus prepared for the third and last operation, performed three months later and involving ...

SINAPSE is developing a world class future in medical imaging for Scotland by drawing on the combined expertise of seven Scottish universities.

SINAPSE is developing a world class future in medical imaging for Scotland by drawing on the combined expertise of seven Scottish universities.

Abnormalities in the vascular pattern of the retina are associated with retinal diseases and are also risk factors for systemic diseases, especially cardiovascular diseases. The three-dimensional retinal vascular pattern is mostly formed congenitally, but is then modified over life, in response to aging, vessel wall dystrophies and long term changes in blood flow and pressure. A characteristic of the vascular pattern that is appreciated by clinicians is vascular tortuosity, i.e. how curved or kinked a blood vessel, either vein or artery, appears along its course. We developed a new quantitative metric for vascular tortuosity, based on the vessels angle of curvature, length of the curved vessel over its chord length (arc to chord ratio), number of curvature sign changes, and combined these into a unidimensional metric, Tortuosity Index (TI). In comparison to other published methods this method can estimate appropriate TI for vessels with constant curvature sign and vessels with equal arc to ...

The first part of the book describes the normal anatomy of the cerebral arteries and veins, with attention to morphological aspect, embryological development, function, and vascular territories. Cerebral Angiography: Normal Anatomy and Vascular Pathology di Bradac, Gianni Boris su AbeBooks.it - ISBN 10: 3642156770 - ISBN 13: 9783642156779 - Springer Verlag - 2011 - Rilegato This anatomy module of e-Anatomy was designed and created by MD Micheau Antoine and MD Hoa Denis, radiologists in Montpellier (France). arteriovenous malformation; arteriovenous fistula MR angiography, and especially Gd-enhanced 3D MRA, has recently emerged and offers excellent visualization of venous morphology from multiple orientations. An overview of the current non-invasive MRA methods and their applications has been provided during depiction of normal venous anatomy. CT angiography of the cerebral arteries (also known as a CTA carotids or an arch to vertex angiogram) is a noninvasive technique allows visualization of ...

A noninvasive method to evaluate the native coronary arteries would be a major clinical advance. In this objective study comparing free-breathing 3D coronary MRA with and without T2prep, we demonstrated that T2prep improved CNR and definition of the LAD and LCx but made no significant difference in visible LAD length. The latter was primarily influenced by imaging volume. In contrast, visualization of the LCx appeared to be related to its anatomic location. The improved visualization of the LCx with T2prep is likely due to improved suppression of myocardium and veins. As previously discussed by Brittain et al,7 T2prep should suppress deoxygenated venous blood (Figure 7B⇑) owing to its shorter T2. We observed a trend toward an improved CNR between arterial and venous blood. This may be particularly important, because the paths of the great cardiac vein and LCx are quite close. This suppression might also be helpful for individuals in whom the vein crosses the LAD (Figure 7A⇑ and 7B⇑). ...

In addition to expanding our knowledge of the process of HCMV maturation, information from these studies will also be utilized to develop new antiviral therapies. We established founder colonies from West Africa, controlled for diversity, linkage disequilibrium and population stratification. Differential effects of tranylcypromine and imidazole on mammary carcinogenesis in rats fed low and high fat diets. This study reports on a combination of multi-echo acquisition with time-resolved undersampled PR imaging and its application to peripheral magnetic resonance angiography.. Moving a clinic system into a vertically integrated delivery system resulted in limited increases in quality of care indicators. Comparison of cervical os versus vaginal evidentiary findings during sexual assault exam. Resveratrol production in bioreactor: Assessment of cell physiological states and plasmid segregational stability. Germination of Aspergillus fumigatus inside avian respiratory macrophages is associated with ...

BACKGROUND: No golden diagnostic standard is available to diagnose chronic gastrointestinal ischemia (CGI). GOALS: We aimed to establish an accurate prediction model for CGI, based on clinical symptoms and radiologic evaluation of the amount of stenosis in the celiac artery (CA) and superior mesenteric artery (SMA) by means of computed tomography-angiography or magnetic resonance (MR)-angiography. STUDY: We prospectively included 436 consecutive patients with clinical suspicion of CGI in a tertiary referral center. Predictors for CGI were obtained by comparing clinical parameters to the diagnosis of CGI. Multivariable logistic regression was used to combine the strongest predictors in a model. A score chart based on the prediction model was provided to calculate the risk of CGI. RESULTS: CGI was present in 171/436 (39%) patients (67 y; range, 54 to 74 y; 27% male). Strongest predictors for CGI were female gender [odds ratio (OR)=1.44; 95% confidence interval (CI), 0.85-2.43], weight loss ...

Conventional angiography is the diagnostic standard for determining the presence, location and severity of heart disease. An EB, CT, EBT Angiography are different forms of angiographies that offers similar results if a convetional angiography is not necessary. Find an angiography clinic facility in your area.

View more ,We sought to investigate the T1 kinetics of blood and myocardium after three infusion schemes of gadobenate dimeglumine (Gd‐BOPTA) and subsequently compared contrast‐enhanced whole‐heart coronary MRI after a bolus Gd‐BOPTA infusion with nonenhanced coronary MRI at 1.5 T. Blood and myocardium T1 was measured in seven healthy adults, after each underwent three Gd‐BOPTA infusion schemes (bolus: 0.2 mmol/kg at 2 mL/sec, hybrid: 0.1 mmol/kg at 2 mL/sec followed by 0.1 mmol/kg at 0.1 mL/sec, and slow: 0.2 mmol/kg at 0.3 mL/sec). Fourteen additional subjects underwent contrast‐enhanced coronary MRI with an inversion‐recovery steady‐state free precession sequence after bolus Gd‐BOPTA infusion. Images were compared with nonenhanced T2‐prepared steady‐state free precision whole‐heart coronary MRI in signal‐to‐noise ratio, contrast‐to‐noise ratio, depicted vessel length, vessel sharpness, and subjective image quality. Bolus and slow infusion schemes resulted in ...

Design: Blinded comparison of CTA and MRA with confirmatory DSA (Renal Artery Diagnostic Imaging Study in Hypertension [RADISH] study). Setting: 6 hospitals in the Netherlands. Patients: 356 hypertensive patients 18 to 75 years of age (mean age 52 y, 52% men) with diastolic blood pressure , 95 mm Hg were routinely screened for RAS, and had ≥ 1 predefined clinical clue indicating RAS. Exclusion criteria were known allergy to iodinated contrast agents; pregnancy; and contraindications to MRA, CTA, or DSA. Description of tests: CTA, MRA, and DSA were done within a 3-month period for each patient; no intervention was done before testing was complete. The degree of stenosis was determined by the diameter of the most severely affected part of a renal artery measured and related to the reference diameter (diameter of a representative nonaffected portion of the artery beyond the site of poststenotic dilatation [if present]). Fibromuscular dysplasia (FMD) was diagnosed when multiple aneurysms separated ...

TY - JOUR. T1 - MR angiography and 2-D phase-contrast imaging for evaluation of meso-rex bypass function. AU - Stefek, Heather A.. AU - Rigsby, Cynthia K. AU - Berhane, Haben. AU - Popescu, Andrada Roxana. AU - Rajeswaran, Shankar. AU - Superina, Riccardo A. PY - 2019/2/7. Y1 - 2019/2/7. N2 - Background: The meso-Rex bypass restores blood flow to the liver in patients with extrahepatic portal vein thrombosis. Stenosis occurs in some cases, causing the reappearance of portal hypertension. Complications such as thrombocytopenia present on a spectrum and there are currently no guidelines regarding a threshold for endovascular intervention. While Doppler ultrasound (US) is common for routine evaluation, magnetic resonance (MR) angiography with two-dimensional phase-contrast MRI (2-D PC-MRI) may improve the assessment of meso-Rex bypass function. Objectives: To determine the feasibility and utility of MR angiography with 2-D PC-MRI in evaluating children with meso-Rex bypass and to correlate meso-Rex ...

Contrast-enhanced magnetic resonance angiography (MRA) employs the use of blood pool contrast agents (CA) such as gadolinium (Gd3+) complexes that allow for delayed phase arterial

|i|Purpose|/i|. Retrospective comparison between gadofosveset trisodium and gadobenate dimeglumine steady state magnetic resonance angiography (SS-MRA) of the thoracic vasculature at 1.5T using signal-to-noise ratio (SNR) and vessel edge sharpness (ES) as markers of image quality. |i|Materials and Methods|/i|. IRB approval was obtained. Twenty separate patients each underwent SS-MRA using high-resolution 3D ECG-triggered coronal IR-TFE at 1.5T approximately 3-4 minutes following 10 or 15 mL gadofosveset or 20 mL gadobenate. ROIs were placed in the right atrium, left ventricle, left atrium, ascending aorta, descending aorta, and right pulmonary artery to estimate SNR. Vessel ES was estimated as 20-80% rise distances from line intensity profiles in the left pulmonary vein, ascending aorta, and descending aorta. Data were analyzed using nonpaired Students |svg xmlns:xlink=http://www.w3.org/1999/xlink xmlns=http://www.w3.org/2000/svg style=vertical-align:-0.11285pt;width:5.9250002px; id=M1 height=

Vascular malformations (VM) are complex lesions present in various anatomical locations with a variety of clinical manifestations. Time-resolved MRA combined with parallel imaging and echo sharing schemes offer a reasonable alternative to more invasive diagnostic methods such as digital subtraction angiography (DSA) in evaluation of VMs. MRI is becoming the imaging modality of choice in assessing morphological issues regarding VMs. Time-resolved MRA can play an important role in characterizing these lesions and can influence therapeutic decision-making. [...] ...

The arterial and venous blood vessels will fill with contrast, but this will not actually tell the reader the determination of the flow direction. On rare occasions, a patient may have a condition called sub-clavian steal syndrome (SSS, for short.) This condition can be discovered through a procedure called MRA carotid flow quantification of the carotid vessels. This is not a procedure that is always done with a carotid MRA study, so it needs to be specifically requested by the referring physician, the radiologist or vascular specialist. Additionally, not all MRI locations are familiar with performing flow quantification on the blood vessels, but this is something easily taught.. Additionally, one should have flow quantification MRI software available to load the images, calculate blood flow and determine the flow directions, flow speeds and more.. Some of the patients present with vertigo (dizziness), positional vertigo (turning of the head), tinnitus (ringing in the ears), numbness of the ...

Next, the authors focus on recent literature data related to the role of endothelial nitric oxide and inducible nitric oxide in physiological and pathophysiological conditions. Nitric oxide is a free radical which, in reactions with various molecules, causes multiple biological effects. It is exceptionally regulated and extends to almost every cell type and function within circulation.. Extracranial carotid artery stenosis is a major cause of stroke and is treated with either carotid endarterectomy (CEA) or percutaneous transluminal angioplasty (PTA) and carotid artery stenting (CAS). In this collection, several types of imaging study have been used to identify complications related to in-stent restenosis, including Doppler ultrasound, computed tomography angiography, digital subtraction angiography, magnetic resonance angiography, intravascular ultrasound, and optical coherence tomography.. The authors go on to discuss some recent randomized studies that compared different d rug-eluting balloon ...

TY - BOOK. T1 - Fast Reduction of Undersampling Artifacts in Radial MR Angiography with 3D Total Variation on Graphics Hardware. AU - Knoll, Florian. AU - Unger, Markus. AU - Clason, Christian. AU - Diwoky, Clemens. AU - Pock, Thomas. AU - Stollberger, Rudolf. PY - 2009. Y1 - 2009. UR - http://math.uni-graz.at/mobis/publications/SFB-Report-2009-022.pdf. M3 - Other report. T3 - SFB Report. BT - Fast Reduction of Undersampling Artifacts in Radial MR Angiography with 3D Total Variation on Graphics Hardware. PB - .. ER - ...

BACKGROUND:. Cerebral infarction is a major contributor to childhood morbidity and mortality in sickle cell anemia (SCA). DESIGN NARRATIVE:. The investigators tested the hypotheses that young children with SCA experienced a variable period of asymptomatic progressive central nervous system (CNS) vasculopathy prior to cerebral infarction; that pre-infarct CNS vasculopathy could be identified by non-invasive imaging techniques:MRI, magnetic resonance angiography (MRA), and transcranial Doppler (TCD); and that therapeutic intervention at this stage of the disease could significantly reduce the subsequent occurrence of cerebral infarction. MRI, MRA, TCD, and standardized neurologic and psychometric examinations were performed yearly in a cohort of homozygous Hb SS children enrolled at 2-4 years of age. Subjects without MRI evidence of cerebral infarction who had significant cerebral vasculopathy (cerebral arterial stenosis on MRA and/or elevated blood flow velocity on TCD) were randomized to receive ...

There were 729 respondents (729/2767, 26.3%) currently employed in a facility accredited in extracranial carotid testing (78.4% TD, 18.0% MD, 3.6% other role). Respondents used the following modalities for quality assurance (QA) correlation of DUS results: arteriography 69.7%, computed tomographic angiography (CTA) 86.1%, magnetic resonance angiography 76.1%, and surgical findings 63.1%. 89.4% of respondents reported use of , 1 modality. According to MD respondents, angiographic correlation studies were analyzed by NASCET methodology in 85.5% of facilities; ECST in 4.0% of facilities; 10.5% of MD respondents were uncertain of the method used. In response to whether there should be one set of standardized diagnostic criteria for carotid DUS, 68.1% (494/725) of answered yes. In response to whether laboratories should be required to incorporate standardized carotid criteria, 68.4% (494/722) answered yes. Answers to these two questions had a high degree of correlation (R=0.756, P=,0.001). There was ...

Dissection of the carotid and vertebral arteries is a rare entity with less than 5 new cases per 100.000 of the general population every year. However, it represents an important cause of cerebral ischaemia in young and middle-aged patients. Carotid dissection may either be associated with aortic dissection or may exclusively affect the carotid artery, either caused by trauma or occurring spontaneously.[1] US may be more than 90% sensitive in the diagnosis of carotid dissection, thus being a reliable technique to exclude the presence of this entity. Nevertheless, definite diagnosis and the extent of disease should always be evaluated with a cross-sectional imaging technique such as computed tomography angiography or magnetic resonance angiography.[2, 3] One characteristic but indirect finding of carotid dissection is the detection of a high resistance flow pattern at the initial part of the internal carotid artery, suggestive of distal occlusion or high-grade stenosis. This is explained by the ...

Objective: To present three cases of young adults with lateral medullary ischaemic events associated with a hypoplastic vertebral artery (VA). All three patients had two additional atherosclerotic or non-atherosclerotic risk factors for stroke. Patients and methods: One female, aged 40 years, and two males, aged 38 and 37 years, each with two risk factors for stroke, presented to the emergency department with acute onset of symptoms and findings consistent with lateral medullary syndrome. All three patients underwent emergency CT scan of the brain followed by MRI and magnetic resonance angiography (MRA). Results: The CT scans were negative in all patients. MRI revealed a lateral medullary lesion in only one patient. All three patients had a hypoplastic VA ipsilateral to the clinical ischaemic event on MRA. Conclusions: Hypoplasia of VA is not considered a risk factor for stroke as it is a common variant in up to 75% of the general population. However, in our patients, hypoplastic VA coexisted ...

Purpose: To evaluate the feasibility of assessing coronary vasodilation following exogenous nitrates, using magnetic resonance angiography (MRA). The assessment of coronary response to exogenous nitrovasodilators may have a diagnostic and prognostic impact in patients with coronary artery disease. To date, stress imaging of coronary artery vasomotion has been con?ned to the catheterization laboratory. MRA is emerging as a noninvasive tool for coronary artery imaging. Materials and Methods: Coronary MRA was performed in 20 healthy volunteers (12 males, age = 33 8). We used spiral spoiled gradient echo (SSGE) sequences for imaging of coronary artery lumen. After the baseline short-axis view of the coronary artery was obtained, sublingual nitroglycerin (NTG) (0.3 mg) was administered. In all subjects, shortaxis views of the coronary artery were acquired repetitively (8-10 times) from 1 up to 10 minutes after NTG administration. Measurements were obtained by two independent investigators. Results: ...

The purpose of the study was to evaluate the diagnostic performance of non- invasive imaging methods of detecting carotid artery stenosis in comparison to digital subtraction angiography (DSA) by undertaking a systematic review of the literature. The non-invasive methods reviewed include multislice computed tomography (MSCT) angiography, duplex ultrasound (US) and magnetic resonance (MR) angiography.A search of medical databases (PubMed, Medline, ScienceDirect, Proquest) of the English literature was performed and 22 studies with 68 comparisons were found to meet the selection criteria and included in our study. 5 studies were performed with MSCT angiography, 11 with duplex US and 13 with MR angiography. Both duplex US and MR angiography were studied in 7 out of 24 US and MR studies. The diagnostic value of each imaging modality was reviewed in terms of the sensitivity and specificity compared to DSA, which is regarded as the standard method.The mean sensitivity and specificity for MSCT ...

Arteries, MRA scan sequence. Magnetic resonance angiography (MRA) scans showing the undamaged side of a male 23-year-old motorcycle crash patient who has sustained damage to his right internal carotid artery. For the damaged side see clip number K003 4408. For both sides see clip number K003 4410. Master same as original. - Stock Video Clip K003/4409

Importance: Disruption of extracellular matrix integrity is critically involved in both intracranial aneurysm and bone fragility. Furthermore, both intracranial aneurysm and osteoporosis have a female predominance, and sex hormones are considered to affect this discrepancy. Objective: To evaluate the association between bone mineral density and intracranial aneurysm. Design, Setting, and Participants: A cross-sectional study conducted with 14 328 patients who underwent brain magnetic resonance angiography and bone mineral densitometry as a part of a health examination at a specialized center for comprehensive health examination in Seoul, the largest metropolitan area in the Republic of Korea, between December 2004 and November 2015 ...

Computed Tomography (CT or CAT scan) is an imaging method that uses x-rays to create pictures of cross-sections of the body.. Electron-beam computed tomography (EBCT) is a test that looks for specks of calcium (called calcifications) in the walls of the coronary arteries.. Magnetic resonance imaging (MRI) uses a large magnet and radio waves to look at organs and structures inside the body.. Magnetic Resonance Angiography (MRA) is a non-invasive technique MRI technique used to diagnose blood vessel patency or blood flow abnormalities.. Multidetector CT (MDCT) scans take images of the beating heart, and show calcium and blockages in the heart arteries.. PET (Positron Emission Tomography) produces high energy, 3-D computer-reconstructed images measuring and determining the function or physiology in a specific organ, tumor, or other metabolically active site.. Virtual colonoscopy (VC) (or Computerized Tomographic Colonography (CTC) uses x rays and computers to produce two- and three-dimensional ...

A large range of ictal and early postictal changes have been described on MRI. These changes can be confined to the area of epileptic activity or remote from this region (Table 1). Knowledge of these anomalies may be important to not be confused with other focal pathology such as brain tumor, stroke or encephalitis. Local MRI findings include restricted diffusion in diffusion weighted images (DWIs), hyperintensity T2 better seen in fluid-attenuated inversion recovery (FLAIR) images, swelling of the focal structure, cerebral hyperperfusion in magnetic resonance perfusion, and increased vascularity in MR angiography.[2] These techniques make it possible to highlight focal lesions and remote lesions responsible for these epileptic seizures. These MRI images are often reversible but can also become permanent and irreversible in severe and prolonged epilepsy (Figure 1).[2] The physiopathologic basis of remote periictal findings is not well understood and several hypotheses remain. Ipsilateral ...

3. Systolic abdominal bruits (without a diastolic bruit) suggest renal vascular hypertension. Bilateral renal artery stenosis (RAS) can lead to severe exacerbation of hypertension and decline in renal function with initiation of ACE inhibitors or ARBs. Imaging to diagnose RAS include duplex ultrasonography, CTA (in individuals with normal renal function), and magnetic resonance angiography (MRA ...

Contrast-enhanced peripheral MR angiography from the abdominal aorta to the pedal arteries: Combined dynamic two-dimensional and bolus-chase three-dimensional acquisitions Academic Article ...

OBJECTIVES: To demonstrate the advantages of radial k-space trajectories over conventional Cartesian approaches for accelerating the acquisition of vessel-selective arterial spin labeling (ASL) dynamic angiograms, which are conventionally time consuming to acquire. MATERIALS AND METHODS: Vessel-encoded pseudocontinuous ASL was combined with time-resolved balanced steady-state free precession (bSSFP) and spoiled gradient echo (SPGR) readouts to obtain dynamic vessel-selective angiograms arising from the four main brain-feeding arteries. Dynamic 2D protocols with acquisition times of one minute or less were achieved through radial undersampling or a Cartesian parallel imaging approach. For whole-brain dynamic 3D imaging, magnetic field inhomogeneity and the high acceleration factors required rule out the use of bSSFP and Cartesian trajectories, so the feasibility of acquiring 3D radial SPGR angiograms was tested. RESULTS: The improved SNR efficiency of bSSFP over SPGR was confirmed for 2D dynamic imaging.

A primary care physician may recommend an appointment with a neurologist when a patients symptoms are indicative of a brain or nervous system disorder. In addition, neurologists consult on injuries or trauma to these sensitive organs and nerves. Our expert specialists can provide an effective diagnosis and recommend the most effective treatment for each condition to help patients maintain the best possible quality of life.. Neurological exams can include testing vision, strength, coordination, reflexes, sensation, memory, speech, language, and other cognitive abilities. A neurologist may also order diagnostic tests be performed such as computer axial tomograpy (CAT) scan, magnetic resonance imaging/magnetic resonance angiography (MRI/MRA), spinal tap, electroencephalography (EEG), electromyography/nerve conduction velocity (EMG/NCV).. Our neurologists focus on accurately diagnosing and treating these disorders with the most advanced equipment available. With our convenient locations and ...

Venous aneurysm, especially of the IVC, is very rare, and its etiology, risk factors and prognosis are poorly understood. Inflammatory disease, thrombosis, trauma and long-standing right heart failure are possible risk factors. It may also be the result of embryonic malformation. Clinical presentation is variable and it may be a chance finding in asymptomatic patients.. CT, magnetic resonance angiography and venography provide detailed images of the aneurysmal structure. Surgery is indicated for all such patients if symptomatic, but an incidental diagnosis in an asymptomatic patient is a challenging situation.. Ethical disclosuresProtection of human and animal subjects. The authors declare that no experiments were performed on humans or animals for this study.. Confidentiality of data. The authors declare that no patient data appear in this article.. Right to privacy and informed consent. The authors declare that no patient data appear in this article.. Conflicts of interest. The authors have no ...

We introduce a probabilistic approach to vessel network extraction that enforces physiological constraints on the vessel structure. The method accounts for both image evidence and geometric relationships between vessels by solving an integer program, which is shown to yield the maximum a posteriori (MAP) estimate to the probabilistic model. Starting from an over-connected network, it is pruning vessel stumps and spurious connections by evaluating the local geometry and the global connectivity of the graph. We utilize a high-resolution micro computed tomography (µCT) dataset of a cerebrovascular corrosion cast to obtain a reference network and learn the prior distributions of our probabilistic model. As a result, we perform experiments on micro magnetic resonance angiography (µMRA) images of mouse brains and discuss properties of the networks obtained under different tracking and pruning approaches. ...

class=kwd-title>Keywords: magnetic resonance angiography magnetic resonance imaging bicuspid aortic valve aneurysm aortic surgery Copyright notice and Disclaimer The publishers final edited version of this article is available free at Blood circulation We present pre- and post-operative imaging findings inside a 29-year-old man having a bicuspid aortic valve (BAV) with fusion of the right and remaining […]. ...

TY - GEN. T1 - Automatic assessment of cardiac perfusion MRI. AU - Ólafsdóttir, Hildur. AU - Stegmann, Mikkel Bille. AU - Larsson, Henrik B.W.. PY - 2004. Y1 - 2004. N2 - In this paper, a method based on Active Appearance Models (AAM) is applied for automatic registration of myocardial perfusion MRI. A semi-quantitative perfusion assessment of the registered image sequences is presented. This includes the formation of perfusion maps for three parameters; maximum up-slope, peak and time-to-peak.. AB - In this paper, a method based on Active Appearance Models (AAM) is applied for automatic registration of myocardial perfusion MRI. A semi-quantitative perfusion assessment of the registered image sequences is presented. This includes the formation of perfusion maps for three parameters; maximum up-slope, peak and time-to-peak.. M3 - Article in proceedings. BT - Medical image computing and computer assisted intervention, MICCAI. PB - Springer. T2 - Medical image computing and computer assisted ...

3 What investigations might you consider to confirm your diagnosis?. Short answer. Diagnosis is essentially clinical, being based on history and examination. However, scintigraphy using pertechnetate labelled with technetium-99 and magnetic resonance angiography can help assess tissue viability.. 4 How is this condition treated?. Short answer. Prioritise any other life threatening conditions. Discuss all cases with a specialist unit that routinely performs peripheral thrombolysis. Immediate treatment includes rapid rewarming, analgesia, ibuprofen (used for its selective antiprostaglandin activity), oral antibiotics, and tetanus prophylaxis. Debride blisters containing clear fluid and apply topical aloe vera to the wound. Prohibit smoking and raise the limb. Consider adjuvant therapy.. 5 What is the role of surgery in this condition?. Short answer. Surgery is not usually indicated in the acute phase and should be delayed until the frostbitten area is thoroughly demarcated. However fasciotomy may ...

Arterial Spin Labeling (ASL) is a non-invasive, non-contrast, perfusion imaging technique which is inherently SNR limited. It is, therefore, important to carefully design scan protocols to ensure accurate measurements. Many pseudo-continuous ASL (PCASL) protocol designs have been proposed for measuring cerebral blood flow (CBF), but it has not yet been demonstrated which design offers the most accurate and repeatable CBF measurements. In this study, a wide range of literature PCASL protocols were first optimized for CBF accuracy and then compared using Monte Carlo simulations and in vivo experiments. The protocols included single-delay, sequential and time-encoded multi-timepoint protocols, and several novel protocol designs, which are hybrids of time-encoded and sequential multi-timepoint protocols. It was found that several multi-timepoint protocols produced more confident, accurate, and repeatable CBF estimates than the single-delay protocol, while also generating maps of arterial transit time. Of

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Non-invasive, high resolution contrast arteriography without arterial catheterization or nephrotoxicity has become possible using paramagnetic contrast agents and high performance MR imaging systems. The success of this technique is reflected by its rapid integration into clinical practice throughout the world. Three-dimensional (3D)contrast MRA has quickly expanded to encompass virtually all vascular territories using a variety of magnets and imaging strategies. The rapid evolution of this technique is also reflected in the expanded volume of this second edition. Beyond familiarizing the reader with the basic principles underlying 3D Contrast MRA, all relevant technical aspects are addressed, potential pitfalls are identified, and tailored imaging strategies for different vascular regions are described. To widen the scope, the 2nd ed. of 3D Contrast MRA includes invited case studies performed by renowned investigators. The description of imaging techniques have been standardized to facilitate

Non-invasive, high resolution contrast arteriography without arterial catheterization or nephrotoxicity has become possible using paramagnetic contrast agents and high performance MR imaging systems. The success of this technique is reflected by its rapid integration into clinical practice throughout the world. Three-dimensional (3D)contrast MRA has quickly expanded to encompass virtually all vascular territories using a variety of magnets and imaging strategies. The rapid evolution of this technique is also reflected in the expanded volume of this second edition. Beyond familiarizing the reader with the basic principles underlying 3D Contrast MRA, all relevant technical aspects are addressed, potential pitfalls are identified, and tailored imaging strategies for different vascular regions are described. To widen the scope, the 2nd ed. of 3D Contrast MRA includes invited case studies performed by renowned investigators. The description of imaging techniques have been standardized to facilitate

TY - JOUR. T1 - Accelerated dual-contrast first-pass perfusion MRI of the mouse heart. T2 - Development and application to diet-induced obese mice. AU - Naresh, Nivedita K.. AU - Chen, Xiao. AU - Roy, Rene J.. AU - Antkowiak, Patrick F.. AU - Annex, Brian H.. AU - Epstein, Frederick H.. PY - 2015/3/1. Y1 - 2015/3/1. N2 - Purpose: Gene-modified mice may be used to elucidate molecular mechanisms underlying abnormal myocardial blood flow (MBF). We sought to develop a quantitative myocardial perfusion imaging technique for mice and to test the hypothesis that myocardial perfusion reserve (MPR) is reduced in a mouse model of diet-induced obesity (DIO). Methods: A dual-contrast saturation-recovery sequence with ky-t undersampling and a motion-compensated compressed sensing reconstruction algorithm was developed for first-pass MRI on a small-bore 7 Tesla system. Control mice were imaged at rest and with the vasodilators ATL313 and Regadenoson (n = 6 each). In addition, we imaged mice fed a high-fat ...

Maximum Intensity Projection (MIP) consists of projecting the voxel with the highest attenuation value on every view throughout the volume onto a 2D image 1. Such an algorithm is rather simple: for each XY coordinate, only the pixel with the hig...

The disappointingly slow progress in developing effective therapies for ischemic stroke has led to a re-evaluation of the strategies for stroke drug development and the methods used in clinical trials. Magnetic resonance imaging (MRI) techniques have been proposed and have begun to be used in stroke trials as a means of optimizing patient selection and as a direct measure of the effect of treatments on the brain.. One objective in all clinical trials is the selection of a sample that is sufficiently homogeneous to reduce the statistical variance of the data and thereby optimize the sensitivity of the design to detecting a therapeutic response, while remaining representative of the population of interest. Ischemic stroke trials have traditionally sought to limit the range of disease studied according to one or more of several dimensions, such as clinical severity at the time of enrollment, exclusion of non-ischemic causes for the clinical syndrome, lesion location and vascular territory, stroke ...

PURPOSE: In vessel-encoded pseudo-continuous arterial spin labeling (ve-pCASL), vessel-selective labeling is achieved by modulation of the inversion efficiency across space. However, the spatial transition between the labeling and control conditions is rather gradual, which can cause partial labeling of vessels, reducing SNR-efficiency and necessitating complex postprocessing to decode the vessel-selective signals. The purpose of this study is to optimize the pCASL labeling parameters to obtain a sharper spatial inversion profile of the labeling and thereby minimizing the risk of partial labeling of untargeted arteries. METHODS: Bloch simulations were performed to investigate how the inversion profile was influenced by the pCASL labeling parameters: the maximum (Gmax ) and mean (Gmean ) labeling gradient were varied for ve-pCASL with unipolar and bipolar gradients. The findings in the simulation study were subsequently confirmed in an in vivo volunteer study. Moreover, conventional and optimized

inproceedings{DHM-2007-LeeKC, author = Na-Young Lee and Gye-Young Kim and Hyung-Il Choi, booktitle = {Proceedings of the First International Conference on Digital Human Modeling}, doi = 10.1007/978-3-540-73321-8_74, isbn = 978-3-540-73318-8, pages = 646--654, publisher = {Springer International Publishing}, series = {Lecture Notes in Computer Science}, title = {3D Modeling of the Vessels from X-Ray Angiography}, volume = 4561, year = 2007 ...

Learn more about AneurysmFlow Cerebral aneurysm flow quantification. View specifications, download support documents and discover related products.

The report focuses in decision making abilities and supports to make effective counter strategies in order to achieve competitive advantage. Current market scenario of the segment and forecasts of the market situation have also been bounded in this market report.. Angiography Injectors market report top manufacturers covered in this report are GE Healthcare, Bayer AG (Medrad Inc.), Bracco Imaging, Guerbet Group, Ulrich, Nemoto Kyorindo, Sino Medical-Device Technology, Apollo RT, Vivid Imaging, Angiodynamics (Navilyst Medical.. To Grab the SAMPLE or PURCHASE the Full Report please click on the Link @ https://www.qyresearchgroups.com/request-sample/1066002. The Global Angiography Injectors Analysis to 2025 is a specialized and in-depth study of the Angiography Injectors industry with a focus on the global market trend. The report aims to provide an overview of global Angiography Injectors with detailed market segmentation by component, type, application and geography. The global Angiography ...

DI-fusion, le Dépôt institutionnel numérique de lULB, est loutil de référencementde la production scientifique de lULB.Linterface de recherche DI-fusion permet de consulter les publications des chercheurs de lULB et les thèses qui y ont été défendues.

Winterer, J.; Laubenberger , J.; Scheffler, K.; Neumann, K.; Bayraktarli , Y.; Allmann, K.-H.; Uhrmeister, P.; Langer, M.: Contrast-Enhanced Subtraction MR Angiography in Occlusive Disease of the Pelvic and Lower Limb Arteries: Results of a Prospective Intraindividual Comparative Study with Digital Subtraction Angiography in 76 Patients. Journal of Computer Assisted Tomography 23 (4), pp. 583 - 589 (1999 ...

Occlusion balloon catheters of 5.2- or 6-French have been used for a few decades in various endovascular treatments of body trunk vascular lesions. However, these catheters may be difficult to place in cases of excessive vessel tortuosity, small vessels, and anatomic complexity. Recently, the introduction of the double lumen microballoon catheters for body trunk vascular lesions has allowed operators to advance them into more distal, smaller, and more tortuous vessels. Since the launch of the first generation microballoon catheters onto the market in Japan in 2011, the microballoon catheters have evolved and are now generally available for clinical use ...