نتایج جستجو برای: computed tomography iterativeimage reconstruction

تعداد نتایج: 377600  

Journal: :geopersia 2011
kazem saadat hossain rahimpour-bonab mohammad reza esfahani jafar vali

for obtaining reservoir petrophysical properties, for example porosity, non-destructive methods such as x-ray computed tomography, ct, seems to be precise and accurate. porosity is deducted from the ct image with a single scan via different techniques, such as pore space detection by image segmentation techniques then correlation with porosity. more than one hundred samples with carbonate li...

Journal: :journal of dentomaxillofacil radiology, pathology and surgery 0
zahra dalili department of maxillofacial radiology, guilan university of medical sciences, dental school, rasht, iran jalil khademi department of orthodontics, guilan university of medical sciences, dental school, rasht, iran. faegheh gholinia , department of orthodontics, guilan university of medical sciences, dental school, rasht, iran. nafiseh khanjani department of maxillofacial radiology, guilan university of medical sciences, dental school, rasht, iran

introduction: due to the complexity of facial asy-mmetry, the diagnosis of different aspects of asymmetry via conventional radiographs is not precise. in this study, we investigated findings of facial asymmetry by using cone- beam computed tomography (cbct) images. materials and methods: in this descriptive study, we evaluated cbct findings of 18 patients i.e. a group of 14 females and 4 males ...

ژورنال: :مجله علمی دانشگاه علوم پزشکی گرگان 0
فریدا عابسی abesi f احسان موعودی moudi e بابل، میدان ولایت، خیابان فلسطین، صندوق پستی 853 ، تلفن 32291408-011 ، نمابر 22391093 سینا حقانی فر haghanifar s مصطفی نجفی najafi m

زمینه و هدف : ناحیه قدامی فک پایین محل انجام بسیاری از اعمال جراحی فک و دندان است. از طرفی این ناحیه محل شاخه ثنایایی عصب آلوئولار تحتانی است. این مطالعه به منظور تعیین میزان رویت و پیشروی شاخه ثنایایی عصب آلوئولار تحتانی در تصاویر cone beam computed tomography انجام شد. روش بررسی : در این مطالعه توصیفی تحلیلی 105 تصویر cbct از نظر وجود یا عدم وجود شاخه ثنایایی و میزان پیشروی عصب آلوئولار تحتان...

Journal: :iranian journal of radiology 0
fariba rezaeetalab department of pulmonary medicine, m}oo vm{ea{ospi~el bmsw{mavc}nkwovw{ yiogmmwe{calossiuoomsmashhad university of medical sciences,, iran +98-5118598818, [email protected]; department of pulmonary medicine, m}oo vm{ea{ospi~el bmsw{mavc}nkwovw{ yiogmmwe{calossiuoomsmashhad university of medical sciences,, iran +98-5118598818, [email protected] donya farrokh department of radiology, imam reza hospital, mashhad university of medical sciences, iran

Journal: :iranian red crescent medical journal 0
vahid noorian department of general surgery, medical school, shahid beheshti university of medical sciences, iran +98-9122158199, [email protected]; department of general surgery, medical school, shahid beheshti university of medical sciences, iran +98-9122158199, [email protected] arya motaghi department of radiology, medical school, shahid beheshti university of medical sciences, iran

background paranasal sinus ct has high sensitivity and specificity for sinusitis. however, this modality is costly and involves greater radiation exposure than plain radiographs. objectives we tried to compare 10-cut limited ct scan and standard ct scan in the diagnosis of sinusitis. materials and methods we conducted a cross sectional case series from august to december 2010 on 150 patients wi...

2011
Tanuja Srivastava Raghuvir Singh

Algebraic Reconstruction Technique (ART) is an iterative algorithm to obtain reconstruction from projections in a finite number of iterations. The present paper discuses the convergence achieved in small number of iteration even when projection data is available in only four directions. Keywords-ART, Image Reconstruction, Convergence, Projections, Computed Tomography

2016
Daniil Kazantsev Enyu Guo Anders Kaestner William R. B. Lionheart Julian Bent Philip J. Withers Peter D. Lee

X-ray imaging applications in medical and material sciences are frequently limited by the number of tomographic projections collected. The inversion of the limited projection data is an ill-posed problem and needs regularization. Traditional spatial regularization is not well adapted to the dynamic nature of time-lapse tomography since it discards the redundancy of the temporal information. In ...

2015
Radin A. Nasirudin Kai Mei Petar Penchev Andreas Fehringer Franz Pfeiffer Ernst J. Rummeny Martin Fiebich Peter B. Noël

access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

2001
Irene Buvat

We describe a non-parametric bootstrap method to estimate the statistical properties of Single Photon Emission Computed Tomography (SPECT) and Positron Emission Tomography (PET) images, whatever the type of noise in the projections and the reconstruction algorithm. Using analytical simulations and real PET data, this method is shown to accurately predict the statistical distribution, hence the ...

Journal: :iranian journal of radiology 0
hilal sahin department of radiology, faculty of medicine, ege university, 35100, turkey +90-2323902202, [email protected]; department of radiology, faculty of medicine, ege university, 35100, turkey +90-2323902202, [email protected] naim ceylan department of radiology, faculty of medicine, ege university, 35100, turkey +90-2323902202, [email protected] selen bayraktaroglu department of radiology, faculty of medicine, ege university, 35100, turkey +90-2323902202, [email protected] sezai tasbakan department of pulmonology, faculty of medicine, ege university, turkey ali veral department of pathology, faculty of medicine, ege university, turkey recep savas department of radiology, faculty of medicine, ege university, 35100, turkey +90-2323902202, [email protected]

abstract necrotizing sarcoid granulomatosis (nsg) is a rare disease which is classified in the spectrum of pulmonary angiitis and granulomatosis. it is a variant of sarcoidosis and differs from it histologically. diagnosis is based on the pathological features, but radiology may help in the differential diagnosis. it is characterized by alveolar infiltrates or parenchymal nodules in multidetect...

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