نتایج جستجو برای: ct scan
تعداد نتایج: 180359 فیلتر نتایج به سال:
بررسی تحلیل ریشه دندانهای ثنایای مجاور دندان نیش نهفته فک بالا در تصاویر رادیوگرافی معمولی و CT scan
مقدمه: تحلیل ریشه دندانهای ثنایا در فک بالا از عوارض نهفتگی دندان نیش می باشد که می تواند منجر به کشیدن دندان، نیاز به درمان ارتودنسی ویا هر دو گردد. هدف از انجام این مطالعه بررسی تحلیل ریشه دندانهای ثنایای مجاور دندان نیش نهفته در فک بالا در رادیوگرافیهای معمولی و CT scan می باشد. مواد و روش ها: این مطالعه بر روی 14بیمار (با دامنه سنی 20-13 ساله) که دارای 18 دندان نیش نهفته بودند، صورت گرفت...
Background: Given the children's susceptibility to the harmful radiation of computerized tomography (CT) scans, ultrasonography can be a good alternative in staging pediatric lymphoma. The present study aimed to assess the predictive value of abdominal ultrasonography compared to CT scan in children with lymphoma. Materials and Methods: Fifty-two children with confirmed lymphoma were included ...
introduction: maxillofacial region is one of the most complex regions in the body and radiographic imag-ing of this region is difficult because of clinical situation and patient’s cooperation. aim of this study was to evaluate efficient of waters as a preliminary radiography for diagnosis of midface fractures. methods and materials: this was experimental, cross-sectional and prospective study. ...
Abstract Background: Given the different prevalence of accessory spleen in previous studies and no information about its rate of detection and also its known side effects, this study was designed to determine the prevalence and associated factors of accessory spleen among patients referred to a CT scan center in Tehran between 2008 and 2010. Methods: In this cross- sectional study, all pat...
در پژوهش حاضر نانوذرات شامل فازهای Fe3O4 و Fe(OH)3 به روش همرسوبی تولید شدند. اثر تغییر pH محیط بر اندازه، ساختار و خواص مغناطیسی نانوذرات توسط تکنیک‌های TEM، XRD و VSM مطالعه شد. نتایج این پژوهش نشان داد که نانوذرات بدست آمده در pH=11.5 برای مطالعات MRI مناسب هستند. ذرات بدست آمده توسط محلول Iohexol به عنوان سورفکتانت، در محیط آبی پراکنده و پایدار شدند. سوسپانسیون بدست آمده به صورت وریدی به مو...
OBJECTIVES We evaluate whether integrated fluorodeoxyglucose-positron emission tomography and computed tomography (FDG-PET/CT) scan can diagnose the presence of lymph node metastasis more accurately than computed tomography (CT) scan alone. METHODS Forty-two patients with lung cancer preoperatively underwent integrated PET/CT scan using FDG and CT scan and underwent pulmonary resection and ly...
Background & Aim: Measuring the length of kidneys is an important issue in diagnosis and treatment of renal diseases. In various diseases, kidneys become larger or smaller than normal. Ultrasonography is a suitable method for measuring renal length because it is accurate, noninvasive, available and with low cost. Nowadays, multislice spiral CT scanners are widely used for evaluation of rena...
Introduction: The rapid use of computed tomography (CT) scan is of great concern, due to increase in patients’ dose. Optimization of CT protocol is a vital issue in dose reduction. This study aimed to optimize radiation dose in cranial CT and assess modifications in image quality under radiation dose reduction. Material and Methods: A poly(me...
background and aims. cone-beam computed tomography (cbct) is an imaging system which has many advantages over computed tomography (ct). in ct scan, hounsfield unit (hu) is proportional to the degree of x-ray attenuation by the tissue. in cbct, the degree of x-ray attenuation is shown by gray scale (voxel value). the aim of the present study was to investigate the relationship between gray scale...
In the last 20 years, the use of computed tomography (CT) to evaluate thoracic diseases has rapidly gained popularity and CT has become firmly established as an important research and diagnostic modality. In particular, CT has played an important role in improving our knowledge about the pathophysiology of the adult respiratory distress syndrome (ARDS) and in determining the morphological and f...
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