نتایج جستجو برای: ct scan angiography
تعداد نتایج: 216009 فیلتر نتایج به سال:
Seventy-three patients with acute nonhemorrhagic stroke in the carotid territory were investigated for the cause of the stroke: middle cerebral artery (MCA) occlusion/stenosis or internal carotid artery (ICA) occlusion/stenosis; embolus from the heart and extra-cranial arteries or thrombosis. The study is prospective and consecutive comprising stroke patients below the age of 75 years, admitted...
BACKGROUND AND IMPORTANCE We analyzed the physiopathology of the association between cervical artery dissections (CADs), intracranial aneurysms (IAs), and aneurysmal subarachnoid hemorrhage. CLINICAL PRESENTATION A 43-year-old woman presented with diffuse subarachnoid hemorrhage (Fisher 3; Hunt-Hess 1). computed tomography angiography revealed a cervical internal carotid artery dissection and...
background although the aim of cardiac computed tomographic angiography (cta) is to visualize the cardiac, coronary, and great vessels, portions of noncardiac structures such as lung, mediastinum, bones and abdomen are visible on the scan. some have suggested that the scans should be evaluated in all field of view. some other believe that reporting accidental findings can lead to unnecessary fo...
در این پروژه روشی برای مدل سازی قطعات صنعتی از عکسهای ct ارائه شده است. در فصل دوم فیزیک پرتو برداری ct و تولید تصویر به اختصار توضیح داده شده است. در فصل سوم الگوریتمهای پردازش تصویر که در این پروژه به کار رفته شرح داده شده است. توسط این الگوریتم ها عمل قطعه بندی و شناسایی لبه انجام می شود که در فصل مذکور روش های لبه یابی به کمک الگوریتم sobel و canny و مزایا و معایب هر کدام تشریح شده است و در...
introduction: endoscopy is an invasive procedure and finding noninvasive alternative tools in detection of probable upper gastrointestinal (gi) tract injuries following caustic ingestion is an area of interest. the present study aimed to evaluate the screening performance characteristics of thoraco-abdominal computed tomography (ct) scan in this regard. methods: this prospective cross sectional...
FDG PET CT scan is considered to be a sensitive tool to detect skeletal metastasis in known malignancies. However, it’s high sensitivity and low specificity may account for false positive diagnosis in cases of trauma, infection, inflammation and other benign conditions. Skeletal hemangioma is one of the common benign conditions which are typically ametabolic on FDG PET CT with no uptake on bone...
The purpose of this study is to evaluate a direct measure of calcium burden by using dual-energy computed tomography (DECT) during contrast-enhanced coronary imaging, potentially eliminating the need for an extra noncontrast X-ray acquisition. The ambiguity of separation of calcium from contrast material on contrast-enhanced images was solved by using virtual noncontrast images obtained by DECT...
The diagnosis of pulmonary embolism is based on several distinct steps. Faced with the suspicion embolism, we are led to use a clinical probability score guide rest examinations. Revised Geneva and Wells two best validated scores. They identify low-, medium-, high-risk patients in simple way. third step, if not high, assay D-dimers. A negative result excludes predictive value close 100%. last t...
Abstract Background Cerebral neoplasm arises from brain, spinal cord and meningeal cells. Not only malignant cerebral neoplasm also benign tumor could lead to death due to mass effect on vital structures. Access to these tumors is difficult, and MRI and CT scan could be helpful in determining anatomical location of tumors and distinction of malignant from benign. Objective For better and ea...
Background and purpose: Squamous Cell Carcinoma (SCC) is the most common head and neck malignancy. To decrease the side effects of treatment and the rate of mortality, careful staging for proper treatment plan is necessary. The purpose of this prospective study was to compare the diagnostic value of two different imaging methods (Computed Tomography (CT) and Magnetic Resonance Imaging (MRI)...
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