نتایج جستجو برای: CT
تعداد نتایج: 134835 فیلتر نتایج به سال:
background and aims. the imaging techniques commonly used for foreign body detection include plain radiography, xeroradiography, computed tomography (ct) scans, magnetic resonance imaging (mri) and ultrasonography. the aim of the present study was to compare cone-beam computed tomography (cbct) with conventional ct scan in determination of the exact location of a foreign body in the maxillofaci...
the c7-ras 6/061-004 training course by the international atomic energy agency/regional cooperative agreement (iaea/rca) was held in chiba in 2014. the syllabus, pre- and post-course evaluations, and survey questionnaire results were assembled in this course. the post-course evaluation, including 32 questions similar to the pre-course evaluation, was performed right after the end of the final e...
introduction: mandibular fracture is the most common facial bone fracture due to facial trauma. a variety of imagings have been used for diagnosis of mandibular fractures. however, the choice of imaging for diagnosis of mandibular fractures is controversial.present study compares the accuracy of the three most common imaging methods in mandibular fracture diagnosis panoramic radiography, corona...
introduction: pulmonary embolism (pe) is a common lethal disease that its clinical symptoms may be seen in many other diseases. computed tomography pulmonary angiography (ctpa) is a valuable diagnostic modality for detection of pe. in addition, it can accurately detect the other diseases with clinical symptoms similar to pe. the aim of this study is to evaluate the frequency of pe and nonemboli...
in present pet/ct scanners, pet attenuation correction is performed by relying on the information given by ct scan. in the ct-based attenuation correction methods, dual-energy technique (dect) is the most accurate approach, which has been limited due to the increasing patient dose. in this feasibility study, we have introduced a new method that can implement dual-energy technique with only a si...
the study reflected in this thesis aims at finding out relationships between critical thinking (ct), and the reading sections of tofel and ielts tests. the study tries to find any relationships between the ct ability of students and their performance on reading tests of tofel and academic ielts. however, no research has ever been conducted to investigate the relationship between ct and the read...
موضوع این تحقیق سنتز نانو ذرات کربوکسیلات آلوموکسان از بوهمیت(bo) و بررسی قابلیت آن برای جذب رنگ (ry) 84reactive yellow می باشد. همچنین اثرات افزودن نانو ذره مالئات آلوموکسان(mal-a) به غشاء چیتوسان (ct) با مطالعه خواص فیزیکی و قدرت جذب رنگ ry توسط غشاء مورد بررسی قرار گرفت. روش solution-casting برای ساخت غشای جاذب ct/mal-a بکار گرفته شد. ساختار مواد سنتز شده با استفاده از ft-ir, sem, xrd و آنال...
براکی تراپی سرطان پروستات به عنوان رایج ترین نوع درمان شناخته شده است. که در این روش درمانی دز بالایی از اشعه به طور مستقیم به غده پروستات داده می شود. در این تحقیق الگوریتمی جهت شناسایی موقعیت و تعداد دانه های کاشته شده درون پروستات بعد از کاشت با استفاده از پردازش و ثبت تصاویر رادیوگرافی دیجیتالی و ct جهت ارزیابی تعداد دقیق دانه ها حین عمل و 30 روز پس از کاشت استفاده گردید و همچنین جهت ارزیاب...
introduction computed tomography scans are a very important tool for diagnosis and assessment of response to treatment in the practice of medicine. ionizing radiation in medical imaging is undoubtedly one of the most powerful diagnostic tools in medicine. yet, as with all medical interventions, there are potential risks in addition to the clear potential benefits. materials and methods two refe...
introduction: the advent of dual-modality pet/ct scanners has revolutionized clinical oncology by improving lesion localization and facilitating treatment planning for radiotherapy. in addition, the use of ct images for ct-based attenuation correction (ctac) decreases the overall scanning time and creates a noise-free attenuation map (6map). ctac methods include scaling, s...
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