Arterial Spin LabelingPerfusionPseudo-continuous arterial spinMagneticArteriesImagingSequencesBolusStrokeUtilizeCerebral blooVisualizationFast Spin EchoAnatomyContrastDiagnosisDetectionCapillaryDigitalDataFlowPhaseSignalPerfusion and diffusionContrast-enhancedNoninvasiveUltrasoundDiffusionGadoliniumVascularQuantitativeAcquisitionSequenceCerebralClinicalVesselTissueGenerallyElectronDiagnosticTimeDynamicIncludeSimilarPatientsTechnique
Arterial Spin Labeling22
- The signal to noise ratio (SNR) and acquisition time were compared with various numbers of signal average (NSA) of rapid pseudo-continuous arterial spin labeling (pCASL) using the 10-mm thick slice width and narrow scan range focusing the level of basal ganglia by healthy volunteers. (minervamedica.it)
- Combined angiography and perfusion using radial imaging and arterial spin labeling. (ox.ac.uk)
- Visualizing artery-specific blood flow patterns above the circle of Willis with vessel-encoded arterial spin labeling. (ox.ac.uk)
- Endogenous contrast methods (e.g., arterial spin labeling, ASL) and contrast agent bolus tracking methods (dynamic susceptibility contrast and dynamic contrast enhanced MRI) are some of the methods available to researchers using the Center. (barrowneuro.org)
- Modeling dispersion in arterial spin labeling: validation using dynamic angiographic measurements. (ox.ac.uk)
- A major assumption in arterial spin labeling (ASL) MRI perfusion quantification is the time course of the signal on arrival in the capillary network. (ox.ac.uk)
- Time-SLIP is an Arterial Spin Labeling (ASL) variant that is typically used to depict blood vessels within a targeted region in any imaging orientation. (medical.canon)
- Comparison of cerebral blood flow acquired by simultaneous [15O]water positron emission tomography and arterial spin labeling magnetic resonance imaging. (ox.ac.uk)
- Until recently, no direct comparison between [(15)O]water positron emission tomography (PET) and arterial spin labeling (ASL) for measuring cerebral blood flow (CBF) was possible. (ox.ac.uk)
- Dynamic quantitative nonenhanced magnetic resonance angiography of the abdominal aorta and lower extremities using cine fast interrupted steady-state in combination with arterial spin labeling: a feasibility study. (uchicago.edu)
- This method is exemplified using non-contrast magnetic resonance imaging data from a flow phantom and the cerebral arteries of healthy volunteers and a patient with Moya-Moya disease acquired using a 2D vessel-encoded pseudo-continuous arterial spin labeling pulse sequence. (ox.ac.uk)
- arterial spin labeling and sodium magnetic resonance imaging were applied to quantify cerebral blood flow (CBF) (milliliters per 100 grams of tissue/minute) and brain tissue sodium content (millimoles per liter), respectively. (saltmri.com)
- Xu F, Zhu D, Fan H, Lu H, Liu D, Li W, Qin Q. Magnetic resonance angiography and perfusion mapping by arterial spin labeling using Fourier transform-based velocity-selective pulse trains: Examination on a commercial perfusion phantom. (goldstandardphantoms.com)
- Objective The purpose of this study is to evaluate feasibility, image quality (IQ), and accuracy of noncontrast hybrid arterial spin labeling (NoHASL) magnetic resonance angiography (MRA) compared with time of flight (TOF) MRA and contrast-enhanced (CE) MRA in patients with known/suspected. (deepdyve.com)
- His specific areas of expertise include physiological modeling, arterial spin labeling, Bayesian inference, PET/MRI, and artificial intelligence. (stanford.edu)
- Measuring the labeling efficiency of pseudocontinuous arterial spin labeling. (tsinghua.edu.cn)
- Abstract: Arterial spin labeling (ASL) is a non-invasive MRI technique for measuring cerebral blood flow. (umich.edu)
- Free-breathing Arterial Spin Labeling MRI for the Detection of Pulmonary Embolism. (amedeo.com)
- Our aim was to measure the CBF, oxygen extraction fraction, and cerebral metabolic rate of oxygen use in patients with different severities of middle cerebral artery stenosis or acute stroke by using the arterial spin-labeling and susceptibility-weighted imaging techniques. (ajnr.org)
- Arterial spin-labeling and SWI sequences were used to acquire CBF, oxygen extraction fraction, and cerebral metabolic rate of oxygen. (ajnr.org)
- Both OEF and CBF can be determined using MR susceptometry and arterial spin-labeling (ASL). (ajnr.org)
- With 3T-MRI and 7T-MRI his group visualized and quantified cerebral perfusion and cerebrovascular reserve with arterial spin labeling (ASL) MRI and the burden of intracranial atherosclerosis and plaques with intracranial vessel wall MRI. (svds-at-target.eu)
Perfusion4
- To overcome the problem with excessive examination time for diagnosis of cerebral perfusion and/or the use of contrast agent to determine penumbra, we adopted a new magnetic resonance imaging technique named Acute Stroke Assessment using rapid Pseudo-continuous arterial spin labeling (ASAP-ASL) method. (minervamedica.it)
- Changes in CBF through the major cerebropetal arteries were assessed via phase contrast MR-angiography, and regional cortical tissue perfusion via pseudo-continuous arterial spin labelling. (aging-us.com)
- QASPER ( Q uantitative A rterial S pin Labelling Pe rfusion R eference) is a calibration and quality assurance standard for MRI perfusion measurements using Arterial Spin Labelling (ASL). (goldstandardphantoms.com)
- Except for ASL perfusion imaging, additional physiological information can be derived using ASL during the passage of labeled blood through the cerebral arterial trees into capillaries and tissue, such as dynamic MR angiography, vascular territorial mapping, and other hemodynamic parameter quantification, all of which could also provide useful information in neurovascular applications. (umich.edu)
Pseudo-continuous arterial spin1
- Pseudo-continuous arterial spin labelling was performed on 493 subjects (age 55-90) from a tri-ethnic community-based cohort recruited in London. (liverpool.ac.uk)
Magnetic6
- Pulses of radio waves excite the nuclear spin energy transition, and magnetic field gradients localize the polarization in space. (wikipedia.org)
- Computed tomographic angiography (CTA) and magnetic resonance angiography (MRA) are routinely utilized nowadays in clinical practice. (hindawi.com)
- Magnetic resonance angiography reveals increased arterial blood supply and tumorigenesis following high fat feeding in a mouse model of triple-negative breast cancer. (uchicago.edu)
- Magnetic resonance angiography (MRA) is clinically used for both arterial and venous assessment. (edu.au)
- This dissertation explores the clinical applicability of non-contrast magnetic resonance angiography (MRA) techniques. (edu.au)
- CMS received a request to delete the national noncoverage of blood flow measurement from the Magnetic Resonance Imaging NCD at 220.2 of the NCD Manual and thus permit local Medicare contractor discretion to cover this use under 220.2(D). The requestor points to an apparent contradiction between this noncoverage provision and the national coverage of magnetic resonance imaging under the Magnetic Resonance Angiography NCD at 220.3 of the NCD Manual. (cms.gov)
Arteries2
- In this study ASL data acquired whilst the label was still within larger arteries was used to compare models of label dispersion. (ox.ac.uk)
- The third study reports the accuracy of three electrocardiographically (ECG)-gated subtractive non-contrast MRA techniques, flow-sensitising dephasing gradient prepared MRA (FSD-MRA), variable flip angle fast spin echo MRA (VFA-MRA) and constant flip angle fast spin echo MRA (CFA-MRA), in the below knee arteries in 21 patients, compared to CE-MRA. (edu.au)
Imaging9
- Digital subtraction angiography is considered the imaging method of choice. (hindawi.com)
- Digital subtraction angiography (DSA) is still considered the gold standard among the currently used imaging methods for the diagnosis of an intracranial aneurysm. (hindawi.com)
- Digital subtraction angiography (DSA) is the method of reference for imaging of dural arteriovenous fistula (DAVF). (ajnr.org)
- The goal of this study was to analyze the value of different MR images including 3D contrast-enhanced MR angiography (MRA) with a high temporal resolution in diagnostic and follow-up imaging of DAVFs. (ajnr.org)
- In particular, Fresh Blood Imaging (FBI), Flow Spoiled FBI (FS-FBI) and Time-Spatial Labeling Inversion Pulse (Time-SLIP), are discussed. (medical.canon)
- T2-Weighted intracranial vessel wall imaging at 7 Tesla using a DANTE-prepared variable flip angle turbo spin echo readout (DANTE-SPACE). (ox.ac.uk)
- Characterization of Craniocervical Artery Dissection by Simultaneous MR Noncontrast Angiography and Intraplaque Hemorrhage Imaging at 3T. (tsinghua.edu.cn)
- The second study evaluates the performance of a Non-contrast Hybrid Arterial Spin Labelling NC-MRA technique (NoHASL) for imaging the circle of Willis in 30 patients presenting with known or suspected cerebrovascular ischaemia. (edu.au)
- Exploiting the rich sources of endogenous MRI contrast, he developed imaging techniques for angiography, venography, brain anatomy, and microscopic brain lesions resulting from small vessel disease, including microbleeds and microinfarcts. (svds-at-target.eu)
Sequences1
- PIQE can be used on 2D Fast Spin Echo (FSE) sequences, at both 1.5 and 3T, especially when SNR is low but more sharpness is needed. (medical.canon)
Bolus1
- A deliberately long, labyrinthine flow path ensures that none of the labelled bolus is recirculated before the label decays and ensures fully developed equilibrium magnetisation. (goldstandardphantoms.com)
Stroke1
- Methods Consecutive stroke computed tomography angiography head/neck examinations. (deepdyve.com)
Utilize1
- A family of MR angiography techniques that utilize fresh spins to depict the contrast in blood vessels as an alternative to an injection of an exogenous contrast agent. (medical.canon)
Cerebral bloo1
- Cerebral blood flow (CBF) estimates from arterial spin labelling (ASL) show unexplained variability in older populations. (liverpool.ac.uk)
Visualization1
- XA 3D-Angio provides visualization and analysis tools for rotational images acquired in angiography labs. (medical.canon)
Fast Spin Echo1
- Coronal fast spin-echo T2-weighted image demonstrates herniation of meninges and brain tissue (arrows) with adjacent cerebrospinal fluid into the postmastoidectomy tegmen tympani defect. (medscape.com)
Anatomy1
- 3D angiography provides enhanced 3D views of complex anatomy. (medical.canon)
Contrast1
- Non-contrast angiography (NC-MRA) provides the safest option for MR Angiography. (medical.canon)
Diagnosis2
- Digital subtraction angiography (DSA) is the standard of reference for the diagnosis of dural arteriovenous fistula (DAVF) and for tailoring the appropriate treatment either by endovascular and/or surgical means. (ajnr.org)
- CT Pulmonary Angiography for the Diagnosis of Pulmonary Embolism in Patients with COVID-19: When, Why, and for Who? (amedeo.com)
Detection1
- Computer-aided Pulmonary Embolism Detection on Virtual Monochromatic Images Compared to Conventional CT Angiography. (amedeo.com)
Capillary1
- Differences in macular capillary parameters between healthy black and white subjects with Optical Coherence Tomography Angiography (OCTA). (uchicago.edu)
Digital1
- In the clinical study, the occlusion site estimated by ASAP-ASL showed high correlation with that of digital subtraction angiography (κ=0.63-0.79). (minervamedica.it)
Data1
- CT Angiography Clot Burden Score from Data Mining of Structured Reports for Pulmonary Embolism. (amedeo.com)
Flow1
- Evaluation of flow of chorioretinal capillaries in healthy black and white subjects using optical coherence tomography angiography. (uchicago.edu)
Phase1
- Enoxaparin for outpatients with COVID-19: 90-day results from the randomised, open-label, parallel-group, multinational, phase III OVID trial. (uzh.ch)
Signal1
- the resultant evolving spin polarization can induce a RF signal in a radio frequency coil and thereby be detected. (wikipedia.org)
Perfusion and diffusion1
- Capabilities of MR extend far beyond those basics, into fast acquisition sequences, perfusion and diffusion imaging, MR angiography (MRA), tractography, spectroscopy, and a host of other useful or potentially useful clinical applications. (radiologykey.com)
Contrast-enhanced7
- Non-contrast-enhanced MR angiography is a type of MR angiography that does not use gadolinium contrast to image the blood vessels, unlike the contrast enhanced MR angiography . (radiopaedia.org)
- The addition of gadolinium into the blood (as in contrast-enhanced MR angiography) will reduce the T1 relaxation time, thus increasing the signal of the slow-flowing blood 5 . (radiopaedia.org)
- Generally, these techniques are time-consuming as compared with contrast-enhanced MR angiography . (radiopaedia.org)
- 4. Navot B, Hecht E, Lim R, Edelman R, Koktzoglou I. MR Angiography Series: Fundamentals of Non-Contrast-Enhanced MR Angiography. (radiopaedia.org)
- 5. Wheaton A & Miyazaki M. Non-Contrast Enhanced MR Angiography: Physical Principles. (radiopaedia.org)
- Radial self-navigated native magnetic resonance angiography in comparison to navigator-gated contrast-enhanced MRA of the entire thoracic aorta in an aortic patient collective. (unil.ch)
- The three commonly used MRA techniques are Time-of-Flight MRA (TOF-MRA), phase contrast angiography (PCA), and contrast enhanced MRA (CE-MRA). (justia.com)
Noninvasive2
- Background Information Noninvasive assessment of retinal function in patents with diabetes has traditionally been done using fluorescein angiography, which is especially valuable in assessing advanced stages of retinal neovascularization. (nih.gov)
- Either invasive or noninvasive angiography can be used to establish the diagnosis, based on defined radiologic criteria. (ingentaconnect.com)
Ultrasound1
- These include functional magnetic resonance imaging (fMRI), laser Doppler ultrasound, electron spin resonance spectroscopy (ESR), and fluorescence spectrometry. (nih.gov)
Diffusion1
- In this second of two MR chapters, advanced pulse sequences and fast image acquisition methods, methods for perfusion, diffusion, and angiography imaging, spectroscopy, image quality metrics, common artifacts, MR siting, as well as MR safety issues are described and discussed with respect to the underlying physics. (radiologykey.com)
Gadolinium1
- Unlike ionic (i.e., iodine-based) contrast agents used in conventional contrast angiography (CA), allergic reactions to gadolinium are extremely rare. (cms.gov)
Vascular2
- Dynamic MR angiography of upper extremity vascular disease: pictorial review. (radiopaedia.org)
- Several modalities have been used for non-invasive vascular imaging e.g., computed tomography angiography (CTA) and magnetic resonance angiography (MRA). (justia.com)
Quantitative2
- Reduced-iodine-dose dual-energy coronary CT angiography: qualitative and quantitative comparison between virtual monochromatic and polychromatic CT images. (unil.ch)
- TOF-MRA relying on amplitude differences in longitudinal magnetization between flowing static spins is less quantitative, however it is fast and provides high contrast images. (justia.com)
Acquisition2
- Blatter, D. D., Parker, D. L. & Robison, R. O. Cerebral MR angiography with multiple overlapping thin slab acquisition. (crossref.org)
- The average acquisition time per reconstructed image slice in a single-slice spin echo sequence is clinically unacceptable. (radiologykey.com)
Sequence2
- However, for intracranial vessel-selective angiography, the proposed bSSFP VEPCASL sequence is highly SNR efficient and could provide useful information in a range of cerebrovascular diseases. (uu.nl)
- Field strength/Sequence A 1.5-T/PCASL (spin-echo) and first-pass imaging (gradient-echo). (unav.edu)
Cerebral3
- Bilgel, M., Roy, S., Carass, A., Nyquist, P. A. & Prince, J. L. Automated anatomical labeling of the cerebral arteries using belief propagation. (crossref.org)
- Automatic labeling of cerebral arteries in magnetic resonance angiography. (crossref.org)
- The major characteristic of MMD is a steno-occlusive change at the end of the internal carotid artery (ICA), middle cerebral artery (MCA), and/or proximal anterior cerebral artery (ACA) that is accompanied by the formation of smoke-like abnormal blood vessels at the base of the skull, as shown by digital subtraction angiography (DSA) [ 1 , 2 ]. (hindawi.com)
Clinical2
- This review focuses on the technical basics and clinical applications of MR angiography (MRA) with the goal of enabling readers to acquire high-resolution, high quality renal artery MRA. (biomedcentral.com)
- Its benefits compared to the clinical gold-standard method, digital subtraction angiography (DSA), are well-known and widely discussed: a lack of ionizing radiation, non-invasiveness, and no reliance on iodinated contrast agents, the latter being particularly important in patients with impaired renal function. (biomedcentral.com)
Vessel3
- For vessel-selective applications, SNR efficiency can be further improved over single-artery labeling methods by using a vessel-encoded pseudo-continuous ASL (VEPCASL) approach. (uu.nl)
- Using the proposed reconstruction scheme, differences between vessel-selective and non-selective angiography were negligible compared to the dominant factor of total scan time in both simulations and in vivo experiments at acceleration factors up to R = 34. (ox.ac.uk)
- Vemuri, P., Kholmovski, E. G. & Parker, D. L. Choosing the right resolution for vessel visualization in MR angiography. (crossref.org)
Tissue1
- PC measures the difference between the phases of proton spins in tissue and blood and measures both the venous and arterial blood flow at any point in the cardiac cycle. (cms.gov)
Generally1
- This current is one of the factors used to control X-ray exposure and its value is generally displayed on an ammeter (labelled mA in Figure 2.1). (wikibooks.org)
Electron2
- Secondly, the filament supply current is quite large (e.g. 5 A), but the current generated in the electron beam (the so-called X-ray tube current ) is much lower (e.g. 1 mA in fluoroscopy to over 1,000 mA in angiography), depending on the efficiency of the thermionic emission. (wikibooks.org)
- This spins a disc of tungsten during the exposure so that the electron beam strikes an annular region of its surface rather than being concentrated into a small area, as in the stationary anode design we've considered up to now. (wikibooks.org)
Diagnostic2
- Coronary computed tomography angiography (CCTA) to assist diagnostic evaluation of patients with suspected coronary artery disease (320 mg Iodine/mL). (nih.gov)
- Magnetic Resonance Angiography (MRA) is a non-invasive diagnostic test that is an application of MRI. (cms.gov)
Time1
- Furthermore, labeling with 11 C reduces positron range blurring relative to 15 O, 82 Rb, and 13 N ( 10 ) and, with its longer half-life, gives a wider time window to accommodate delays in administration. (snmjournals.org)
Dynamic1
- In this study bSSFP and SPGR are theoretically and experimentally compared for dynamic ASL angiography. (uu.nl)
Include1
- Additional criteria for angiography include displacement of bone fragments and multiple thoracic injuries. (medscape.com)
Similar1
- angiography From the similar( 2005) D: Amy Grappell. (flash-controller.de)
Patients1
- CT angiography (CTA) should be considered in stable patients with first rib fractures if there are absent or decreased upper extremity pulses, regional hemorrhage, and/or brachial plexus injury. (medscape.com)
Technique1
- For this purpose, we used a highly sensitive, single-shot perfusion labeling (SSPL) technique at 7 T and compared sensitivity to detect visual activation at low (2 mm, n = 10) and high (1 mm, n = 8) nominal isotropic spatial, and 3 s temporal, resolution with BOLD in 5½-minute-long experiments. (nih.gov)