We retrospectively compared the acute ASPECTSs on noncontrast CT, CTA source images, and CT perfusion CBV maps from a cohort of confirmed nonlacunar MCA strokes imaged within 3 hours of symptom onset that had angiographic proof of recanalization. There is no prior study, to our knowledge, that has evaluated the accuracy of ASPECTS on all 3 techniques during this early period of hyperacute stroke. Our results confirm the generally accepted notion that in acute cerebral ischemia, regions of hypoattenuation on noncontrast CT and CTA source images and hypoperfusion on CT perfusion CBV maps represent unsalvageable tissue despite reperfusion.19,20 However, in the 3-hour window, CBV appears to be a significantly more sensitive and accurate marker for irreversible ischemic damage. We compared the mean ASPECTS of each CT-based technique and found no difference between the scores on noncontrast CT and CTA source images, but both were different from scores on CT perfusion CBV maps. Compared with the mean ...
PURPOSE: To achieve pathologic correlation in areas of ground-glass attenuation (GGA) in usual interstitialpneumonia(UIP) and, using serial thin-section CT, to observe changes in those lesions. MATERIALS AND METHODS:CT-pathologic correlation was performed at 20 sites of GGA in 18 patients with UIP. Two chest radiologistsassessed serial CT scans, focusing particularly on areas of GGA where open lung biopsy had been performed.Pathologic score of inflammation vs. fibrosis was recorded by two independent lung pathologists. RESULTS: Oninitial CT, GGA appeared as an isolated manifestation at one site, mixed with irregular lines at six, and mixedwith both irregular lines and bronchiectasis/bronchiolectasis at thirteen. Pathologically, those areascorresponded respectively to areas of active inflammation, dominant inflammation, and dominant fibrosis. Theextent of GGA seen on follow-up CT decreased when it was an isolated finding (n=1), and at four of six sites (67%)where it was associated with irregular ...
High resolution CT (HRCT) scanning of the lungs is sensitive for detecting bronchiectasis. Helical CT scanning may also be used but this delivers a higher radiation dose to the patient.
Afterward, high resolution CT of the chest (Figure 2) was done and showed bilateral diffuse ground glass density of the lungs, with centrilobular nodular densit
To evaluate the spectrum, prevalence, and significance of incidental non-cardiac findings (INCF) in patients referred for a non-invasive coronary angiography using a 128-slice multi-detector CT (MDCT). The study subjects included 1,044 patients
TY - JOUR. T1 - Diagnostic value of CT density in patients with diffusely increased FDG uptake in the thyroid gland on PET/CT images. AU - Han, You Mie. AU - Kim, Young Chul. AU - Park, Eun Kyung. AU - Choe, Jae Gol. PY - 2010/7. Y1 - 2010/7. N2 - OBJECTIVE. The purpose of this article is to determine the diagnostic significance of thyroid density as determined by CT in patients with a diffuse hypermetabolic thyroid on PET/CT images. SUBJECTS AND METHODS. One hundred twelve patients were enrolled in this study, and all underwent PET/CT and a thyroid function test between August 2007 and December 2008. The 56 study patients enrolled had visible 18F-FDG uptake in the thyroid, whereas the 56 control subjects had no visible FDG uptake. Maximum standardized uptake values (SUV max), Hounsfield units, thyroid-stimulating hormone levels, free thyroxine levels, and visual assessments of thyroid CT densities (grades 0-2) were evaluated. Analyses were performed to identify variables that differed between ...
We demonstrated significant variability of RAPID CTP-derived ischemic core volumes within different ASPECTS strata, as well as similar strengths of association between ASPECTS≥6 and CTP core ≤50 cc with good clinical outcome in a LVOS cohort that underwent thrombectomy.. NCCT ASPECTS is highly predictive of outcome.12 Importantly, studies have demonstrated that ASPECTS is more accurately determined by CTP as opposed to NCCT or CT angiography.13,14 However, the addition of more radiation, contrast media exposure, and potential treatment delays render the benefits indeterminate. The advantage of RAPID CTP software is the automatization and fast postprocessing, providing consistent and timely quantification of infarcted tissue and an estimation of at-risk tissue volumes. Both methods have been used and validated in recent clinical trials.1-5 The trials with advanced imaging selection techniques demonstrated higher rates of good clinical outcomes but with a potential cost of overselecting ...
TY - JOUR. T1 - Three-dimensional CT angiography with multidetector CT data. T2 - Study optimization, protocol design, and clinical applications in the abdomen. AU - Lawler, Leo P.. AU - Fishman, Elliot K.. PY - 2002/1/1. Y1 - 2002/1/1. N2 - The quality and flexibility of abdominal CT angiograms have been well served by advances in multidetector technology and volume rendering techniques, which allow real-time, interactive modification of high-quality data sets. We have applied this approach to many of the established and developing roles of CT and we discuss and illustrate protocol design and application.. AB - The quality and flexibility of abdominal CT angiograms have been well served by advances in multidetector technology and volume rendering techniques, which allow real-time, interactive modification of high-quality data sets. We have applied this approach to many of the established and developing roles of CT and we discuss and illustrate protocol design and application.. UR - ...
CT Angiogram - MedHelps CT Angiogram Center for Information, Symptoms, Resources, Treatments and Tools for CT Angiogram. Find CT Angiogram information, treatments for CT Angiogram and CT Angiogram symptoms.
TY - JOUR. T1 - Computed tomographic evaluation of canine and feline mediastinal masses in 14 patients. AU - Yoon, Junghee. AU - Feeney, Daniel A. AU - Cronk, Daniel E.. AU - Anderson, Kari L. AU - Ziegler, Laura E.. PY - 2004/11/1. Y1 - 2004/11/1. N2 - A 15-year retrospective analysis of histologically proven canine and feline mediastinal malignancies at the University of Minnesota was conducted to identify patients imaged by computed tomography (CT). The goal of the study was to characterize the CT appearance, to determine if there were any tumor type-specific appearances, and to clarify the role of CT in patients with mediastinal masses. Fourteen patients meeting these criteria were available for evaluation. The masses were characterized based on the presence or absence of contrast enhancement, internal architecture, size, extent of local invasion, the presence of pleural fluid, and the presence of regional vascular invasion. Within the limits of this study and the histopathologic information ...
Definition of Contrast resolution in the Financial Dictionary - by Free online English dictionary and encyclopedia. What is Contrast resolution? Meaning of Contrast resolution as a finance term. What does Contrast resolution mean in finance?
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Todays Tuesday Tip is a video on MRI of the Spine and Facet Cysts and in particular the MRI and CT appearance of Spine Facet Cysts.. This approx 5 minute video below looks at What do spine facet cysts look like on MRI and CT.. If you find the video helpful, please subscribe to the channel.. ...
CAT SCAN; CT SCAN CAT or CT Scan are abbreviations for the same diagnostic test. Computed Tomography (CT) scan or Computerized Axial Tomography (CAT) is a specialized xray that looks at structures of the body from several different angles. A computer is used to produce a 3-dimensional picture called a tomogram. CT provides a look at the structures from several different positions. Each view produces a separate image called a slice. CT is very good at picking up blood and fluid collections, and plays a major role in helping to diagnose problems. A CT can be done to look at almost any structure of the body. CT of the head, chest or abdomen are the most common types of CAT scans done in the critical care unit. They provide quick information that helps to identify multiple injuries following major trauma. A special xray dye (called contrast) can be injected during CT if the doctors want to look specifically at the blood vessels. This can help to identify bleeding from a blood vessel. When contrast ...
What does a brain ct scan show - Would a CT scan show cysts in the brain? If so, would a dr mention them if seen during a brain CT scan after a head injury from a car accident? It would. Ct scans of the brain can provide detailed information about brain pathology, thus providing more information related to injuries and/or diseases of the brain. Findings could bleeding, brain injury and skull fractures in patients with head injuries. However, MRI will be more precise for details of soft tissue.
A CT angiogram is a less invasive test than a standard angiogram. A standard angiogram involves threading a thin tube called a catheter through an artery in your arm or leg up to the area being studied. But with a CT angiogram, no tubes are put in your body. To learn more, see the topic Angiogram.. If your doctor sees that one or more of your blood vessels are narrowed or blocked, you may need a standard angiogram anyway to double-check the abnormal results from the CT angiogram. This is more likely to happen if your doctor is considering surgery to treat the narrowing or blockage.. If your doctor finds a major blockage in one of your blood vessels during a CT angiogram, you wont be able to get an immediate angioplasty to clear the blockage. You will need a separate procedure. But if you have a standard angiogram and the doctor finds a major blockage, he or she can perform an angioplasty during the angiogram.. ...
A CT angiogram is a less invasive test than a standard angiogram. A standard angiogram involves threading a thin tube called a catheter through an artery in your arm or leg up to the area being studied. But with a CT angiogram, no tubes are put in your body. To learn more, see the topic Angiogram.. If your doctor sees that one or more of your blood vessels are narrowed or blocked, you may need a standard angiogram anyway to double-check the abnormal results from the CT angiogram. This is more likely to happen if your doctor is considering surgery to treat the narrowing or blockage.. If your doctor finds a major blockage in one of your blood vessels during a CT angiogram, you wont be able to get an immediate angioplasty to clear the blockage. You will need a separate procedure. But if you have a standard angiogram and the doctor finds a major blockage, he or she can perform an angioplasty during the angiogram.. ...
World Literature is an exciting way to prepare for the multicultural classrooms of the 21st century. The BC College of Teachers recognizes World Literature as a teachable subject for high school. World Literature also fulfills the English requirement for elementary teachers.. You are strongly encouraged to attend an orientation for teachers, offered through the Faculty of Education. For date information, please visit the website for the Faculty of Education. Any questions that pertain to teaching can be directed to the Faculty of Education advisor, Jacquie Breadon.. ...
TY - JOUR. T1 - Image quality and radiation dose of renal perfusion CT with low-dose contrast agent. T2 - a comparison with conventional CT using a 320-row system. AU - Asayama, Yoshiki. AU - Nishie, Akihiro. AU - Ishigami, K.. AU - ushijima, yasuhiro. AU - Kakihara, Daisuke. AU - Fujita, N.. AU - Morita, K.. AU - Ishimatsu, K.. AU - Takao, S.. AU - Honda, Hiroshi. PY - 2019/8/1. Y1 - 2019/8/1. N2 - AIM: To compare perfusion computed tomography (CT) with reconstructed image from source data using low-dose contrast agent and conventional 320-row CT for the evaluation of renal tumours. MATERIALS AND METHODS: Twenty-eight patients underwent conventional CT (C-CT) and 26 patients underwent perfusion CT with low-dose (40 ml) contrast agent. Image noise, arterial visualisation, the sharpness of the corticomedullary junction (CMJ), and overall image quality were each assessed using a four-point scale. The tumour detection rate for lesions ,4 cm (n=66) was also evaluated. Quantitative image parameters ...
Purpose: To assess knowledge about the degree of radiation dose related to routine CT examinations among local medical staff and patients. Materials and Methods: A retrospective study was conducted in a major public hospital by administering a questionnaire survey to both, the medical staff and the patients with regard to their knowledge about the radiation dosage associated with routine CT examinations. Two types of surveys were designed for the two groups of participants. The first group of participants included the medical staff, which consisted of Physicians, Radiologists, and Medical Imaging Technologists (MITs). A number of well-structured questions were developed to detect their knowledge about radiation dosage associated with CT scans. The second group included patients who were referred for CT examinations of different body regions. They were administered a questionnaire survey with questions designed to discover whether they had been provided the relevant information about CT ...
(KudoZ) French to English translation of scanner dévaluation: follow-up CT scan [Cancer Treatment - Medical (general) (Medical)].
Ct Brain Images Anatomy - anatomy of the brain ct images, ct anatomy of brain images, ct brain images anatomy, ct images of normal brain anatomy, ct images of the brain with anatomy, ct scan brain images anatomy
The CT (Computed Tomography) scan or the CAT (Computer-Aided Tomography) scan is a diagnostic procedure that takes a detailed cross-sectional x-ray picture of a slice of the body.. To get a CT scan, the patient lies very still on a table, which is slowly moved horizontally while the x-ray machine rotates around the patient and takes pictures from many angles. A computer then combines the pictures into a very detailed cross-sectional image. The length of the procedure depends on the areas to be x-rayed. For the chest area, the procedure takes about 20 seconds.. CT scans can show the shape, size and the exact location of organs and tissues in any slice of the body more clearly than other diagnostic tools. This technique can help find enlarged lymph nodes, which might contain cancer that has spread from the lung. CT scans are more sensitive than routine chest x-rays in finding early lung cancers. CT scans are also used in detecting masses in the liver, adrenal glands, brain and other internal ...
Computed Tomography (CT or CAT) Scan of the Spine What is a CT scan of the spine? Computed tomography is an imaging test that uses X-rays and a computer to make detailed images of the body. A CT scan shows details of the bones, muscles, fat, and organs. CT scans are more detailed than standard X-rays. In standard X-rays, a beam of energy is aimed at the body part being studied. A plate behind the body part captures the variations of the energy beam after it passes through skin, bone, muscle, and other t...
Clinico-demographic profile and comparative assessment of ultrasonography and computed tomography examination in the diagnosis of urinary tract infections
Viral hepatitis Acute viral hepatitis may be caused by one of several viruses: A, B, C, D or E. The viruses which cause hepatitis B, C an ...
Question - Suffering with paralysis, right leg affected, difficulty in standing, normal CT scan, undergoing physiotherapy. Advice?, Ask a Neurologist
A CAT scan or computerized axial tomography is a technique of examining a mass of the body. It allows an individual to see the 3D images of the mass. A CAT scan helps in diagnosing various parts of the body and allows us to see if there are any cranial bleeds or tumor. CAT scan gives more information than regular X-rays which are 2D.The CAT scan procedure tends to be completely painless, however a person needs to lie still for a certain period of time. The patient may have to fast for up to four to six hours depending on the area to be scanned ...
Three axial non-contrast CT images of the abdomen demonstrating a large hyperdense, heterogeneous mass at the left lateral abdominal wall consistent with hemorr
Give students literature selections that will also help them learn about the basic components of literature. This grade 10 textbook features interesting stories and poems from world literature. Categories are arranged by literary devices before moving on to excerpts in historical sequence, helping students to think through the history of ideas from a Christian perspective; units include aspiration, Greece, the Modern Age, paradox, and suspense & mystery. Descartes, Robert Frost, Rossetti, Emily Dickinson, and others are among the prominent authors represented. Lessons included bolded & defined vocabulary words, as well as end-chapter questions. Approximately 453 pages. 10th grade. Abeka World Literature
High resolution CT (HRCT) is normally done with thin section with skipped areas between the thin sections and is mainly useful to detect abnormalities of lung. Pulmonary angiogram - (CTPA) is a medical diagnostic test used to diagnose pulmonary embolism (PE). It employs computed tomography to obtain an image of the pulmonary arteries. Abdominal and pelvic -CT is a sensitive method for diagnosis of abdominal diseases. It is used frequently to determine stage of cancer and to follow progress. It is also a useful test to investigate acute abdominal pain (especially of the lower quadrants, whereas ultrasound is the preferred first line investigation for right upper quadrant pain). Renal stones, appendicitis, pancreatitis, diverticulitis, abdominal aortic aneurysm, and bowel obstruction are conditions that are readily diagnosed and assessed with CT. It is also the first line for detecting solid organ injury after trauma. Extremities - CT is often used to image complex fractures, especially ones ...
The purpose of this study was to analyse the diagnostic value of cerebral CT angiography (CTA) and CT perfusion (CTP) examinations in the detection of acute stroke based on a systematic review of the current literature. The review was conducted based on searching of seven databases for articles published between 1993 and 2013. Diagnostic value in terms of sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV) and accuracy was analysed from 21 articles which were found to meet selection criteria. The mean sensitivity, specificity, PPV, NPV and accuracy for CTA were significantly higher than those for CTP with 83.2% (95% CI: 57.9-100.0%), 95.0% (95% CI: 74.4-100%), 84.1% (95% CI: 50.0-100%), 97.1 (95% CI: 94.0-100%) and 94.0% (95% CI: 83.0-99.0) versus 69.9% (95% CI: 20.0-97.0%), 87.4 (95% CI: 61.0-100.0%), 76.4% (95% CI: 48.0-95.4%), 78.2% (95% CI: 55.8-93.9%) and 89.8% (95% CI: 75.7-97.1%), respectively. This analysis shows that CTA has high diagnostic value ...
[amazon_link asins=1628418257,0781777968,0071843868,0323312888,0781777518,0323065902′ template=ProductCarousel store=finmeacur-20′ marketplace=US link_id=8b3945b0-c6a1-11e7-8188-91bae2df94b9′] Definition: Computed tomography (CT) scan, also called computerized axial tomography (CAT) scan, is used to create cross-sectional images of structures in the body. In this procedure, x-rays are taken from many different angles and processed through a computer to produce a three-dimensional (3-D) image called a tomogram. ……………CLICK & […]
Computerized tomography (CT scan) is a procedure that assists in diagnosing tumors, fractures, bony structures, and infections in the organs and tissues of the body. The procedure is also known as computed axial tomography (CAT scan).
OBJECTIVE: The hypodense sign (HyS) on CT imaging is highly suggestive of pulmonary invasive mould disease (IMD) in patients with haematological malignancies, but its diagnostic utility has not been systematically evaluated on contrast-enhanced CT. The objective of this study was to compare the diagnostic performance of the HyS to other common CT findings in a cohort of haematology patients with proven, probable or possible IMD based on EORTC/MSG criteria. METHODS: We analyzed the diagnostic performance of the HyS to other common CT signs among 127 neutropenic patients with haematological malignancies submitted to both noncontrast-enhanced and contrast-enhanced CT scans of the lungs, including CT pulmonary angiography (CTPA ...
Computed tomography (CT or CAT scan) is a noninvasive diagnostic imaging procedure that uses a combination of x-rays and computer technology to produce cross-sectional images (often called slices), both horizontally and vertically, of the body. A CT scan shows detailed images of any part of the body, including the bones, muscles, fat, and organs. CT scans are more detailed than standard x-rays.. In standard x-rays, a beam of energy is aimed at the body part being studied. A plate behind the body part captures the variations of the energy beam after it passes through skin, bone, muscle, and other tissue. While much information can be obtained from a standard x-ray, a lot of detail about internal organs and other structures is not available.. In computed tomography, the x-ray beam moves in a circle around the body. This allows many different views of the same organ or structure. The x-ray information is sent to a computer that interprets the x-ray data and displays it in a two-dimensional (2D) ...
A 72 year old man attended for follow up computed tomography (CT) of a chronic type A aortic dissection, three years on from his original presentation. The contrast enhanced multislice CT was acquired using retrospective ECG gating. Subsequent reconstruction of the CT images was from a diastolic reconstruction window centred at 75% of the RR interval. This mode of acquisition provided images of the thoracic aorta free of motion artefact. The chronic dissection flap could clearly be seen arising in the proximal, aneurysmal ascending aorta (panel A, axial CT section), extending to the head and neck vessels (panel B, sagittal CT section), and progressing distally to the descending aorta (panel C, three dimensional reconstruction in sagittal section). Advanced post-processing using volume rendering techniques demonstrated the dissection (panel C) and the aneurysm (panel D) in three dimension.. Aortic motion artefact is the most common cause of false positive detection of dissection of the ...
New York-presbyterian Hospital/weill Cornell Medical procedure pricing information for a Brain CT Scan can be found listed below. Find a cost comparison to other providers in New York, NY and see your potential savings.
Impact of contrast CT angiography and whole brain contrast CT perfusion study on the accuracy of cerebrovascular diagnosis in patients presenting with a major stroke-like syndrome. Stroke. 2001; 32(1):325 ...
Our study shows that Hounsfield unit quantification of thrombus in CTA-proved MCA proximal occlusion can predict the success of intravenous rtPA recanalization. Although significant differences were noted when absolute thrombus and contralateral Hounsfield unit values were analyzed, rHU was the strongest predictor of recanalization. Specifically, a cutoff of rHU , 1.382 derived by ROC analysis was associated with nonrecanalization after intravenous rtPA treatment in acute ischemic stroke. This method might be useful for rapid triage of patients for thrombolytic therapy to decide which patients should undergo endovascular rescue therapy.. Our findings are in good agreement with those of Kim et al,13 who found that CT-based measurement of Hounsfield units may be helpful in predicting the effectiveness of thrombolytic therapy. Hemoglobin determines the attenuation of a clot, and lysability appears to increase with increasing hematocrit levels, suggesting that the composition of the thrombus ...
Computed tomography (CT) systems use a series of X-ray images to create an image volume dataset with slices that can be manipulated on any plane using advanced visualization software. The section includes computed tomography scanners, CT contrast agents, CT angiography (CTA and CCTA), CT perfusion, spectral CT (dual-source CT), and iterative reconstruction dose reduction
Computed tomography coronary angiography (CTA) is a newly developed technique for non-invasive evaluation of coronary artery disease. A CT scan is an X-ray procedure that, combined with iodine-based contrast agents, generates cross sectional views of the heart and coronary arteries.. At the Emory Cardiac Imaging Center, we use a state-of-the-art multi-detector CT system to acquire high-resolution images of the heart and great vessels. This advanced technology is being used more and more to identify calcified and non-calcified plaques in the coronary arteries and to exclude the possibility of stenosis due to atherosclerosis. Early stages of coronary atherosclerosis can be detected before the development of coronary arterial narrowing.. ...
Meziane, M.A.; Fishman, E.K.; Siegelman, S.S., 1984: CT diagnosis of hemopericardium in acute dissecting aneurysm of the thoracic aorta
In this paper, we propose a robust 3D rigid registration technique for detecting cerebral aneurysms, arterial stenosis, and other vascular anomalies in a brain CT angiography. Our method is composed o
Question - Having horrible pain and swelling in lung area. Suffer pain. Suggested small nodules in lungs. What should I do?. Ask a Doctor about diagnosis, treatment and medication for Pleural effusion, Ask a General & Family Physician
By Michael H. Crawford, MD Professor of Medicine, Chief of Clinical Cardiology, University of California, San Francisco Dr. Crawford reports no financial relationships relevant to this field of study. SYNOPSIS: Coronary calcium scan on standard CT scans performed for other indications is of equivalent prognostic value to that seen on ECG-gated coronary studies and should be included in radiology test reports. SOURCES: Hughes-Austin JM, Dominguez A 3rd, Allison MA, et al. Relationship of coronary calcium on standard chest CT scans with mortality. JACC Cardiovasc Imaging . . .
Contrast-enhanced multidetector-row computed tomography (MDCT) is now capable of providing high-quality noninvasive views of cardiac anatomy and instant noninvasive coronary angiography. With current generation 64-slice scanners, MDCT can be performed in most patients with minimal patient discomfort and high diagnostic accuracy. MDCT may obviate the need for invasive diagnostic angiography in patients with borderline symptoms or equivocal noninvasive testing. It is useful in assessing the symptomatic patient postrevascularization and in emergency room triage in selected patients with chest pain. Calcified vessels are still difficult to assess, as is the accurate evaluation of implanted coronary stents. The volume of contrast material required for proper opacification limits the use of MDCT in patients with renal dysfunction, but newer emerging technologies will greatly improve these disadvantages in the near future. MDCT is expected to become an integral part of our diagnostic armamentarium in the
{ consumer: A computed tomography (CT) scan uses X-rays to make detailed pictures of structures inside of the body. During the test, you will lie on a table that is attached to the CT scanner, which is a large doughnut-shaped machine. The CT scanner sends X-rays through the body area being studied. Each rotation of the scanner..., clinical: A computed tomography (CT) scan uses X-rays to make detailed pictures of structures inside of the body. During the test, you will lie on a table that is attached to the CT scanner, which is a large doughnut-shaped machine. The CT scanner sends X-rays through the body area being studied. Each rotation of the scanner... } Butte County, California
Objective:To analyze CT appearances of malignant liver tumors after local electromagnetic wave thermal ablation microwave thermal ablation (MTA) or radiofrequency ablation (RFA).Methods:CT scans were performed for twenty-six patients with malignant liver tumors 2 weeks after local electromagnetic wave thermal ablation.The examination was repeated within 3 months.CT features of liver morphological changes and of local complications after the thermal ablation were analyzed,combined with clinical symptoms and lab dada.Results:In 18 cases without abnormal changes,the first postoperative CT scan 2 weeks after the thermal ablation showed well-outlined low density area which appeared bigger than the original size of the tumors,and there was no enhancement in the area.The margin of the low density area showed a faint rim-like enhancement.After a few months,the low density area became smaller and its size was similar to that of the original tumor,the rim-like enhancement of the margin faded gradually and
TY - JOUR. T1 - Computed tomography evaluation of right heart dysfunction in patients with acute pulmonary embolism. AU - He, Hongying. AU - Stein, Marjorie W.. AU - Zalta, Benjamin. AU - Haramati, Linda B.. PY - 2006/3/1. Y1 - 2006/3/1. N2 - Purpose: To evaluate the role of qualitative assessment of right heart dysfunction on multidetector computed tomography (CT) in patients with acute pulmonary embolism. Methods: Seventy-four consecutive adults with pulmonary embolism diagnosed on multidetector nongated CT were identified between July 2002 and March 2004. There were 47 women and 27 men, with a mean age of 62 years. Each CT scan was jointly reviewed by 2 of 3 reviewers in consensus. The CT scans were qualitatively assessed for dilatation of the right ventricle and the position of the interventricular septum. Scans were considered positive for right heart dysfunction if, on visual integration of multiple axial images, the right ventricle was dilated or the interventricular septum was ...
Synonyms for computed axial tomography at Thesaurus.com with free online thesaurus, antonyms, and definitions. Dictionary and Word of the Day.
TY - GEN. T1 - A fixed-point model for pancreas segmentation in abdominal CT scans. AU - Zhou, Yuyin. AU - Xie, Lingxi. AU - Shen, Wei. AU - Wang, Yan. AU - Fishman, Elliot K. AU - Yuille, Alan L.. PY - 2017. Y1 - 2017. N2 - Deep neural networks have been widely adopted for automatic organ segmentation from abdominal CT scans. However, the segmentation accuracy of some small organs (e.g., the pancreas) is sometimes below satisfaction, arguably because deep networks are easily disrupted by the complex and variable background regions which occupies a large fraction of the input volume. In this paper, we formulate this problem into a fixed-point model which uses a predicted segmentation mask to shrink the input region. This is motivated by the fact that a smaller input region often leads to more accurate segmentation. In the training process, we use the ground-truth annotation to generate accurate input regions and optimize network weights. On the testing stage, we fix the network parameters and ...
Global Spectral Computed Tomography (CT) Market By Product Type (Spiral CT, Electron Beam Tomography) And By End-Users/Application (Pharmaceutical Industries, Research and Development) Global Market Share, Forecast Data, In-Depth Analysis, And Detailed Overview, and Forecast, 2013 - 2026
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July 20, 2010 - New dual source CT technology allows a radiation dose of as low as one millisievert (mSv) for computed tomography angiography (CTA) scans, Siemens announced last week at the 2010 Annual Scientific Meeting of the Society of Cardiovascular Computed Tomography (SCCT) in Las Vegas. At SCCT, Somatom Definition Flash CT scanner users also showed how they use the system to display the coronary vessels, as well as the aorta, within one scan. Recently, cardiologists have been using the Somatom Definition Flash to plan the procedure for one of the newest therapy methods for valvular heart disease: transcatheter aortic valve implantation (TAVI). Prior to this minimally invasive intervention, physicians had to examine the hearts anatomy closely. This demand is also supported by the cardiovascular CT applications of the imaging software syngo.via. With automated processes, these applications can spare the cardiologists many manual steps that before were necessary - for instance, to measure ...
A prospective abnormal shadow detecting system detects a prospective abnormal shadow in an image on the basis of image data representing the image and outputs information on the prospective abnormal shadow detected by the prospective abnormal shadow detecting means. Whether the detected prospective abnormal shadow is malignant or benignant is judged, and the information on the prospective abnormal shadow is output in such a manner that whether the prospective abnormal shadow is malignant or benignant can be distinguished.
TY - JOUR. T1 - Measuring noncalcified coronary atherosclerotic plaque using voxel analysis with MDCT angiography. T2 - A pilot clinical study. AU - Clouse, Melvin E.. AU - Sabir, Adeel. AU - Yam, Chun Shan. AU - Yoshimura, Norihiko. AU - Lin, Shezhang. AU - Welty, Francine. AU - Martinez-Clark, Pedro. AU - Raptopoulos, Vassilios. PY - 2008/6/1. Y1 - 2008/6/1. N2 - OBJECTIVE. The purpose of our study was to evaluate a new method using voxel analysis for quantifying noncalcified plaque in coronary arteries using MDCT angiography (MDCTA) compared with luminal stenosis by catheter coronary arteriography. MATERIALS AND METHODS. Forty-one normal and eight abnormal arterial cross sections with noncalcified plaque selected from 40 patients undergoing MDCTA were analyzed for percentage of stenosis and plaque volume using a voxel analysis technique. RESULTS. Using voxel analysis, the normal arterial wall thickness was determined to be 0.8 ± 0.4 mm. Attenuation values (in Hounsfield units) for normal ...
The demonstration of cerebral oedema by computerised axial tomography (CAT) in patients with migraine was drawn to our attention by Drs J Ambrose and J Gawler of London. The subsequent unexpected finding of a significant degree of cerebral atrophy in a migraine sufferer further prompted our interest in the CAT changes in these patients. The findings in 46 patients with migrainous headaches were therefore reviewed.. ...
Our direct, intraindividual head-to-head comparison in the same patient population shows that compared with a routine radiation dose FBP protocol, a 50% reduced radiation dose image acquisition using IR preserves image quality and, more importantly, diagnostic accuracy at coronary CTA. These findings illustrate the potential of substantial radiation dose reduction across the population for coronary CTA studies, enabled by a reduced tube current-time product when iteratively reconstructed, without jeopardizing the diagnostic yield of the examination.. Since its inception, radiation doses associated with noninvasive coronary CTA had risen with each new generation of multidetector-row CT systems and had reached its zenith with the launch of the first-generation 64-slice scanners in the year 2004. With these platforms, radiation doses from coronary CTA were reported to be as high as approximately 30 mSv, with an estimated median of approximately 12 mSv (15). Since then, vigorous efforts have been ...
Objective : To investigate the cases of intracranial abnormal brain MRI findings even in the negative brain CT scan after mild head injury. Methods : During a 2-year period (January 2009-December 2010), we prospectively evaluated both brain CT and brain MRI of 180 patients with mild head injury. Patients were classified into two groups according to presence or absence of abnormal brain MRI finding even in the negative brain CT scan after mild head injury. Two neurosurgeons and one neuroradiologist validated the images from both brain CT scan and brain MRI double blindly. Results : Intracranial injury with negative brain CT scan after mild head injury occurred in 18 patients (10.0%). Headache (51.7%) without neurologic signs was the most common symptom. Locations of intracranial lesions showing abnormal brain MRI were as follows; temporal base (n=8), frontal pole (n=5), falx cerebri (n=2), basal ganglia (n=1), tentorium (n=1), and sylvian fissure (n=1). Intracranial injury was common in patients ...
Abdominal CT scans that include the lumbar spine but that are performed for other purposes may help identify patients with osteoporosis.
Define Computed Tomography, Pituitary. Computed Tomography, Pituitary synonyms, Computed Tomography, Pituitary pronunciation, Computed Tomography, Pituitary translation, English dictionary definition of Computed Tomography, Pituitary. n. Computerized axial tomography. Noun 1. computed axial tomography - a method of examining body organs by scanning them with X rays and using a computer to...
According to an article in the German Medical Journal Deutsches Ärzteblatt Jg.117 Heft 14 3. April 2020 the Munich Hospital Rechts der Isar started a new and simple scheme for COVID-19 detection: Patients with a history of fever or temperature >37.3°C / 99.1°F and a lymphocyte count ,1,1 G/L get an immediate low-dose chest CT scan. This procedure is referenced to the Therapeutic and triage strategies for 2019 novel coronavirus disease in fever clinics published recently in Lancet online at https://www.thelancet.com/pdfs/journals/lanres/PIIS2213-2600(20)30114-4.pdf.. The sensitivity of laboratory PCR tests is low according to the study and laboratory results may last for up to 3 days. A chest CT scan takes a few minutes, and the result is available shortly later. Any detected viral pneumonia in a chest CT scan indicates a COVID-19 infection after exclusion of influenza or RSV. Chest CT scans shall be typically acquired in low dose technique without contrast agent with a slice thickness of ...
Fingerprint Dive into the research topics of Re: Unenhanced computerized axial tomography to detect retained calculi after percutaneous ultrasonic lithotripsy. Together they form a unique fingerprint. ...
Mucocele of the petrous apex is very rare, only three cases having been reported. Since this area is inaccessible to direct examination, imaging, preferably high resolution computed tomography (HR...
Using mobile phones to acquire images in clinical practice enables rapid, collaborative decision making1 and is increasingly common. However, the practice is not completely foolproof, as a recent near miss at our institution demonstrates.. A 45-year-old woman presented with spontaneous subarachnoid haemorrhage secondary to a ruptured anterior communicating artery aneurysm. The anterior communicating artery aneurysm and an unruptured left middle cerebral artery aneurysm were clipped via craniotomy and a ventricular drain was inserted. Serial post-operative computed tomography (CT) brain scans showed an evolving infarction in the left middle cerebral artery territory, presumed to be secondary to temporary clipping at surgery, which became fully established after 28 hours. All cerebral vessels were patent, visualised on a post-operative CT angiogram. Elevated intracranial pressure (, 40 mmHg) and neurological fluctuation prompted a repeat CT scan, a photograph of which was taken from a computer ...
Care guide for Cardiac Computerized Axial Tomography (Inpatient Care). Includes: possible causes, signs and symptoms, standard treatment options and means of care and support.
Learn about abdominal CT scans and how they're used by doctors for intestinal transplant patients at UPMC Children's Hospital of Pittsburgh.
Abdominal CT Scan clinics in Bucharova at the best price. Find doctors, specialized in Diagnostic Imaging and compare prices, costs and reviews.
Maximum intensity projections reconstructions from 2.5 mm unenhanced multidetector computed tomography axial slices were obtained from 49 patients within the first 6 h of anterior-circulation cerebral strokes to identify different patterns of the dense artery sign and their prognostic implications for location and extent of the infarcted areas. The dense artery sign was found in 67.3% of cases. Increased density of the whole M1 segment with extension to M2 of the middle cerebral artery was associated with a wider extension of cerebral infarcts in comparison to M1 segment alone or distal M1 and M2. A dense sylvian branch of the middle cerebral artery pattern was associated with a more restricted extension of infarct territory. We found 62.5% of patients without a demonstrable dense artery to have a limited peripheral cortical or capsulonuclear lesion. In patients with a 7-10 points on the Alberta Stroke Early Programme Computed Tomography Score and a dense proximal MCA in the first hours of ictus ...
Quantitative computed tomography features and clinical manifestations associated with the extent of bronchiectasis in patients with moderate-to-severe COPD So Hyeon Bak,1 Soohyun Kim,2 Yoonki Hong,3 Jeongwon Heo,4 Myoung-Nam Lim,5 Woo Jin Kim3 1Department of Radiology, School of Medicine, Kangwon National University, Chuncheon, Repubilc of Korea; 2Department of Radiology, Kangwon National University Hospital, Chuncheon, Republic of Korea; 3Department of Internal Medicine, School of Medicine, Kangwon National University, Chuncheon, Republic of Korea; 4Department of Internal Medicine and Environmental Health Center, Kangwon National University Hospital, Chuncheon, Republic of Korea; 5Data Analysis Center, Kangwon National University, Chuncheon, Republic of Korea Background: Few studies have investigated the quantitative computed tomography (CT) features associated with the severity of bronchiectasis in COPD patients. The purpose of this study was to identify the quantitative CT features and clinical
All patients were scanned with a 64-slice CT scanner (Sensation 64, Siemens) equipped with a new feature in multislice CT technology, so-called z-axis flying-focus technology.13 The central 32 detector rows acquire 0.6-mm slices, and the flying-focus spot switches back and forth between 2 z positions between each reading. Two slices per detector row are acquired, which results in a higher oversampling rate in the z axis, thereby reducing artifacts related to the spiral acquisition and improving spatial resolution down to 0.4 mm3.13 Angiographic scan parameters included the following: number of slices per rotation, 32×2; individual detector width, 0.6 mm; rotation time, 330 ms; table feed, 3.8 mm per rotation; tube voltage, 120 kV; tube current, 900 mA; and prospective x-ray tube modulation, none. Calcium scoring parameters (similar unless indicated) were a tube current of 150 mA and prospective x-ray tube modulation. The radiation exposure for CT coronary angiography with this scan protocol was ...
TY - JOUR. T1 - DualTrack technology improves optical coherence tomography angiography image quality. AU - De Vitis, Luigi Antonio. AU - Sacconi, R. AU - Carnevali, Adriano. AU - Centoducati, Teresa. AU - Cavalleri, M.. AU - Querques, L. AU - Bandello, F. AU - Querques, G. PY - 2017. Y1 - 2017. N2 - BACKGROUND AND OBJECTIVE: To evaluate the effects of DualTrack Motion Correction Technology on the performance of AngioVue optical coherence tomography angiography (Optovue, Freemont, CA). PATIENTS AND METHODS: Fifty subjects underwent two consecutive examinations with AngioVue. The operator inactivated the eye-tracking (ET) technology before the second examination. Two operators measured execution time, excluded low-quality images, and counted the number of motion artifacts per image. RESULTS: The mean execution time was lower without ET in all the groups (P , .05), regardless of retinal diseases. Percentages of available images and low-quality images were 75.0% and 25.0%, respectively, with ET and ...
TY - JOUR. T1 - Thin-section computed tomography findings of lung adenocarcinoma with inherent metastatic potential. AU - Suzuki, Shigeki. AU - Aokage, Keiju. AU - Yoshida, Junji. AU - Ishii, Genichiro. AU - Matsumura, Yuki. AU - Haruki, Tomohiro. AU - Hishida, Tomoyuki. AU - Nagai, Kanji. PY - 2016/9/22. Y1 - 2016/9/22. N2 - Purpose: The solid component of lung ground-glass nodules on thin-section computed tomography (TSCT) reflects cancer cell progression and invasiveness. The purpose of this study was to clarify the cut-off value of preoperative TSCT findings in treating a lesion suspected of being adenocarcinoma and to recognize the timing of surgical resection for lung nodules. Methods: We reevaluated the TSCT findings in 392 patients with clinical stage IA lung adenocarcinoma who underwent surgical resection between 2003 and 2007. We identified the clinical parameters that were most useful for predicting recurrence and identified a cut-off level for each parameter. Results: Recurrence was ...
Abstract: Ischemic stroke lesion segmentation from Computed Tomography Perfusion (CTP) images is important for accurate diagnosis of stroke in acute care units. However, it is challenged by low image contrast and resolution of the perfusion parameter maps, in addition to the complex appearance of the lesion. To deal with this problem, we propose a novel framework based on synthesized pseudo Diffusion-Weighted Imaging (DWI) from perfusion parameter maps to obtain better image quality for more accurate segmentation. Our framework consists of three components based on Convolutional Neural Networks (CNNs) and is trained end-to-end. First, a feature extractor is used to obtain both a low-level and high-level compact representation of the raw spatiotemporal Computed Tomography Angiography (CTA) images. Second, a pseudo DWI generator takes as input the concatenation of CTP perfusion parameter maps and our extracted features to obtain the synthesized pseudo DWI. To achieve better synthesis quality, we ...
Aims To estimate the life attributable risk (LAR) of cancer incidence over a wide range of dose radiation exposure and a large spectrum of possible diagnostic computed tomographic coronary angiography (CTCA) scenarios.. Methods This study included 561 consecutive patients who underwent a successful prospective ECG-gating CTCA protocol (low-dose group) 64-slice CTCA and 188 patients who underwent retrospective ECG-gating CTCA with ECG-triggered dose modulation CTCA (high-dose group). LAR was computed, given the organ equivalent dose, for all cancers in both sexes. LAR was tabulated for each decile of dose-length product by 10-year age classes, separately for each sex.. Results Estimates of LAR of any cancer for an exposure at age ≤40 year were lower in males than in females for any given quantile. At age ≥50years, LAR was similar between sexes only at the lowest exposure doses, whereas at higher dosage, it was, in general, higher for women. At the median age of this case series (62 years) and ...
This was a retrospective cohort study of 59 patients with a diagnosis of renal stones that had both a non-contrast and contrast-enhanced CT scan in the portal venous phase between 2009 to 2014 in a single center in the United States. Exclusion criteria included patients with medullary nephrocalcinosis, polycystic kidney disease, or with significant CT motion artifact. CT scans were reconstructed at a thickness of 1.25mm with maximum projection intensity images. Image analysis on the contrast-enhanced CT scans was performed by two independent subspecialty radiologists blinded to the clinical information and radiology reports. The reference standard was the number and size of stones seen on the non-contrast enhanced CT scan. At the conclusion of the trial, the sensitivity of thin axial images was 89.9% (95%CI 83.5 to 94.0%), 99.0% (95%CI 94.0 to 99.9%), and 100.0% (95%CI 92.2 to 100.0%) for reviewer 1 and 83.1% (95%CI 75.9 to 88.6%), 98.0% (95%CI 92.6 to 99.7%) and 100.0% (95%CI 92.2 to 100.0%) ...
p,X-ray computed tomography (CT) has been used for diagnosis of pulmonary emphysema because it can reveal the morphology of low attenuation areas. Recently, 99mTc-Technegas imaging, one of several types of scintigraphic techniques, has been used for ventilation scintigraphy. Technegas scintigraphy was performed on 15 patients with pulmonary emphysema, and we compared the extent and degree of abnormal findings on Technegas scintigraphy with the extent of low attenuation areas shown by CT. We classified the findings of Technegas imaging into three grades, from mild to severe, according to the extent of peripheral irregularity and central hot spot formation. We also classified the findings of CT as centrilobular emphysema into three grades from mild to severe according to the extent of low attention areas in the peripheral lung fields. In 5 cases, CT and Technegas assessment resulted in equivalent diagnoses. In eight cases, Technegas images showed more detailed findings than CT images. In the two ...
Reston, Va. (April 15, 2014) - Image Wisely recently launched its third Image Wisely Radiation Safety Case - CT Brain Perfusion Dose Optimization. This is the latest in a series of free, online and mobile-compatible educational offerings, developed with the assistance of the American College of Radiology, that allow radiologists, imaging technologists and medical physicists to assess their understanding of important radiation safety concepts - including dose monitoring and optimization.. Several years ago, the U.S. Food and Drug Administration investigated a series of unexpected high exposures associated with CT brain perfusion procedures that resulted in skin injuries and hair loss, said Lifeng Yu, PhD, primary author of the new radiation safety case. In an appropriate clinical setting where CT perfusion exams are justified and scanning techniques are correctly used, it is unlikely that the radiation dose would reach the threshold level for skin burns to occur. This case presents strategies ...
RADIOLOGY: HEPATOBILIARY: Case# 32822: RCC METASTASIS, HEMANGIOMA. This is a 62 year old male who is three years status post right radical nephrectomy for a renal cell carcinoma. The patient had a previous abdominal CT done two months ago that showed a suspicious liver mass. Pre-contrast images through the liver demonstrate a 2 x 1.5cm low attenuation mass inferiorly and posteriorly which was identified on the previous CT and a 4 x 4cm low attenuation mass within the posterior segment of the right lobe not previously identified. The 4cm mass shows intense but fairly homogenous peripheral enhancement with central low attenuation. Delayed images through the liver show central filling of the large mass. The smaller mass is not visible on post contrast images. The appearance of the small lesion is grossly unchanged from the prior study when it was thought to be a hemangioma. The liver is a common site for the metastatic spread of malignant tumors. Metatstatic lesions are the most common malignant ...
Definition : Computed tomography (CT) scanning systems in which the table moves the patient into the gantry and the x-ray tube rotates around the patient in such a way that each revolution produces one slice. Axial CT scanners are classified according to the geometry of the x-ray tube detector system in generations (e.g., first, second). Typical scanning time for each slice is on the order of a few seconds. These systems are mostly used for diagnostic and examination purposes, including the diagnosis of injuries, lesions, and malignancies.. Entry Terms : Axial CT Scanners , Computed Axial Tomography Scanners , Scanners, Computed Axial Tomography , CAT Scanners. UMDC code : 18446 ...
TY - JOUR. T1 - Computed Tomographic Angiography of Endovascular Abdominal Aortic Stent-Grafts. AU - Yee, Judy. AU - Galdino, Greg. AU - Urban, Joseph. AU - Sawhney, Rajiv. PY - 2004/4/16. Y1 - 2004/4/16. N2 - The treatment of aortic abdominal aneurysms with endovascular repair provides a treatment alternative for high-risk surgical candidates. Computed Tomographic Angiography (CTA) has become the preferred imaging modality for preoperative evaluation of abdominal aortic aneurysms, postoperative assessment of endovascular repair and complications, and long term surveillance. Accurate evaluation of these devices and identification of endoleaks and other complications by the radiologist is critical to assuring successful outcomes.. AB - The treatment of aortic abdominal aneurysms with endovascular repair provides a treatment alternative for high-risk surgical candidates. Computed Tomographic Angiography (CTA) has become the preferred imaging modality for preoperative evaluation of abdominal aortic ...
TY - JOUR. T1 - Gastric cancer staging at isotropic MDCT including coronal and sagittal MPR images. T2 - Endoscopically diagnosed early vs. advanced gastric cancer. AU - Kim, Yoo Na. AU - Choi, Dongil. AU - Kim, Seong Hyun. AU - Kim, Min Ju. AU - Lee, Soon Jin. AU - Lee, Won Jae. AU - Kim, Sung. AU - Kim, Jae J.. PY - 2009/1. Y1 - 2009/1. N2 - Background: The aims of this study are to evaluate and compare the accuracies of isotropic multi-detector row CT (MDCT) including multiplanar reconstruction (MPR) images for preoperative staging of endoscopically diagnosed early gastric cancer (eEGC) and advanced gastric cancer (eAGC). Methods: One hundred and five patients with endoscopically proven gastric cancer underwent isotropic MDCT. Three independent radiologists evaluated T and N staging both on transverse images only and on three orthogonal MPR images. The staging of each tumor was surgico-pathologically confirmed. The receiver operating characteristic (ROC) analysis and the Wilcoxon signed ...
Lobe-based computed tomography assessment of airway diameter, airway or vessel number, and emphysema extent in relation to the clinical outcomes of COPD Kazuyoshi Kurashima,1 Yotaro Takaku,1 Toshiko Hoshi,2 Tetsu Kanauchi,2 Keitaro Nakamoto,1 Noboru Takayanagi,1 Tsutomu Yanagisawa,1 Yutaka Sugita,1 Yoshinori Kawabata3 1Respiratory Medicine, 2Radiology, 3Pathology, Saitama Cardiovascular and Respiratory Center, Saitama, Japan Objective: The aim of this study was to evaluate the relationship between computed tomography assessed lobe-based lung parameters and the clinical outcomes of patients with chronic obstructive pulmonary disease (COPD), including the frequency of exacerbation and annual change in forced expiratory volume in 1 second (FEV1). Patients and methods: We studied 65 patients with COPD. We reconstructed computed tomography images to trace the bronchial tree from right B1 to B10 and created 3 cm circle images around the airways exactly perpendicular to the airway axis in the central, middle
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A study of more than 12,000 children from emergency departments throughout the country in the Pediatric Emergency Care Applied Research Network (PECARN) has identified seven factors that can help physicians determine the need for a computed tomography (CT) scan following blunt trauma to the abdomen. Because CT scans pose radiation hazards for youngsters, the findings may enable doctors to determine which children do not need to be exposed to such tests after a traumatic injury.
Once inside the scanner, the machines x-ray beam rotates around you. Small detectors inside the scanner measure the amount of x-rays that make it through the abdomen. A computer takes this information and creates several individual images, called slices ...
Although a CT brain scan within 12 h of the onset of headache confirms the diagnosis in about 98% of subarachnoid haemorrhage (SAH) patients (Van der Wee et al. 1995), blood is visible in only about 50% a week later (Van Gijn & Van Dougen 1982). Clearly therefore some patients with a sudden onset headache and a normal CT brain scan may still have had an SAH, particularly if the scan is delayed. Detecting the final few cases is important because a missed aneurysmal SAH can be fatal if a recurrent bleed occurs, and clipping or coiling will prevent this.. The standard follow-on test after a negative CT is evidence of blood in the cerebrospinal fluid (CSF). Any test must be sensitive enough to pick up cases of aneurysmal SAH and so allow timely intervention, but specific enough not to expose too many patients to the risk of unnecessary tests,. ...
Routine PET/CT scans are taken while patients are breathing normally. The motions made by breathing can reduce the image quality of the scan. Minimizing the effects of this motion by taking the images and processing the scans differently may improve the image quality.. The PET/CT Scan:. If you agree to take part in this study, an elastic belt will be placed around your lower chest/upper abdomen before your routine PET/CT scan. This belt is used to track your breathing motion. This information will be used to help process the scan.. Your PET/CT scan will be performed as usual. During the scan, researchers will focus on your lower chest/upper abdomen (areas that experience breathing motion). Having to focus on this area might extend the scan by up to 10 minutes.. The additional scan time will not increase your radiation exposure since only PET scanning will be performed.. Length of Study:. Your participation on this study will be complete when your scheduled PET/CT scan is complete.. This is an ...
Introduced in 1970s, Computed tomography (CT) was developed initially as a brain scanner, which is later been used for multiple application. The CT is based on a basic concept: A thin cross-section of the head, a tomographic slice, was examined from multiple angles with a pencil-like x-ray beam. The CT has not only been used for human but also for animals. In many cases, CT imaging can provide valuable information that cannot be obtained with ultrasound and radiography. CT uses x-rays and computer processing to create cross sectional (transverse) slices of internal structures. CT images are not only clear but can isolate a specific internal region. Each CT slice is formatted from multiple x-ray exposures captured as the scan completes a 360 degree rotation. It is important for doctors to know the indications for CT imaging so this modality can be incorporated into a case when financially feasible.. Veterinary Computed Tomography Scanner Market: Drivers and Restraints. The veterinary computed ...
This observer performance study assessed lesion detection in the computed tomography attenuation correction image, as would be produced for myocardial perfusion imaging over a tube current (mA) range. A static anthropomorphic chest phantom containing simulated pulmonary lesions was scanned using the four available mA values (1, 1.5, 2 and 2.5) on a GE Infinia Hawkeye 4. All other computed tomography acquisition parameters remained constant throughout. Twenty-seven cases showing zero to four lesions were produced for a free-response receiver-operating characteristic method. Image observations were completed using our novel web-based ROCView software under controlled conditions. The Jackknife alternative free-response receiver-operating characteristic (JAFROC) figure of merit was used for significance testing, wherein a difference in lesion detection performance was considered significant at P values less than 0.05. Twenty readers with varying computed tomography experience (0-24 years) evaluated ...
TY - JOUR. T1 - Cervical diplomyelia revealed by computed tomography (CT). AU - Giordano, G. B.. AU - Davidovits, P.. AU - Cerisoli, M.. AU - Giulioni, M.. PY - 1982. Y1 - 1982. N2 - An unusual case of cervical diplomyelia diagnosed by computed tomography (ct) is reported. the usefulness of ct examination in the evaluation of spinal dysraphic defects is emphasized, though performed without csf enhancement. visualization of spinal cord splitting in the absence of bony spicula allows the authors to differentiate between diplomyelia and diastematomyelia which have been often described by using both terms interchangeably.. AB - An unusual case of cervical diplomyelia diagnosed by computed tomography (ct) is reported. the usefulness of ct examination in the evaluation of spinal dysraphic defects is emphasized, though performed without csf enhancement. visualization of spinal cord splitting in the absence of bony spicula allows the authors to differentiate between diplomyelia and diastematomyelia ...