نتایج جستجو برای: quantitative computed tomography

تعداد نتایج: 569392  

Journal: :Journal of applied oral science : revista FOB 2003
Andréia Perella Sara Dos Santos Rocha Marcelo de Gusmão Paraiso Cavalcanti

The aim of this study was to evaluate the precision and accuracy of linear measurements of maxillary sinus made in tomographic films, by comparing with 3D reconstructed images. Linear measurements of both maxillary sinus in computed tomography CT of 17 patients, with or without lesion by two calibrated examiners independently, on two occasions, with a single manual caliper. A third examiner has...

2007
George Starkschall Neil Desai Peter Balter Karl Prado Dershan Luo Dianna Cody Tinsu Pan

The purpose of the present work was to describe the development and validation of a series of tests to assess the quality of four-dimensional (4D) computed-tomography (CT) imaging as it is applied to radiation treatment planning. Using a commercial respiratory motion phantom and a programmable moving platform with a CT phantom, we acquired 4D CT datasets on two commercial multislice helical CT ...

Journal: :The Journal of Thoracic and Cardiovascular Surgery 1984

Journal: :journal of research in medical sciences 0
maryam moradi peiman hashemi mohammad momeni

background: the purpose of this study was to evaluate the infl uence of ejection fraction (ef) on peak aortic time (pat) and  peak aortic enhancement (pae) during coronary computed tomography angiography (cta). materials and methods: one-hundred and twenty patients (64 men, 56 women) underwent measurement of coronary cta with a measurement of ef within 3 months of coronary cta.pearson’s correla...

Journal: :iranian endodontic journal 0
pankaj yadav makonahalli jaganath bharath chickmagravalli krishnegowda sahadev praveen kumar makonahalli ramachandra yogesh rao ambereen ali

introduction : to evaluate the efficacy of niti mechanical rotary instrumentation and hedstrom file for gutta-percha/sealer removal computed tomography (ct) was utilized in vitro . materials and methods: thirty extracted human single rooted teeth, each with a single canal were selected. the samples were decoronated with a double faced diamond disk to have 17-mm root; teeth roots were instrument...

Journal: :iranian endodontic journal 0
masoud parirokh hamed manouchehrifar karim ardjomand

abstract: cone-beam computed tomography (cbct) has been accepted as a useful tool for diagnosis and treatment in endodontics. despite a growing trend toward using cbct in endodontic practice the cbct images should be interpreted carefully. this case report presents a case that showed radiolucency inside and around a tooth which was free of pathologic changes under a dental operative microscope ...

Journal: :iranian endodontic journal 0
joedy santa-rosa manoel damião de sousa-neto marco aurelio versiani giselle nevares felipe xavier kaline romeiro

introduction: this study aimed to perform a rigorous sample standardization and also evaluate the preparation of mesiobuccal (mb) root canals of maxillary molars with severe curvatures using two single-file engine-driven systems (waveone with reciprocating motion and oneshape with rotary movement), using micro-computed tomography (micro-ct). methods and materials: ten mb roots with single canal...

Journal: :iranian endodontic journal 0
hadi mokhtari mahdi niknami hamidreza mokhtari zonouzi aydin sohrabi negin ghasemi amir akbari golzar

introduction: the aim of the present in vitro study was to compare the accuracy of cone-beam computed tomography (cbct) in determining root canal morphology of mandibular first molars in comparison with staining and clearing technique. methods and materials: cbct images were taken from 96 extracted human mandibular first molars and the teeth were then evaluated based on vertucci’s classificatio...

Journal: :iranian journal of radiology 0
yaser safi department of oral and maxillofacial radiology, school of dentistry, shahid beheshti university of medical sciences, tehran, iran mahkameh moshfeghi department of oral and maxillofacial radiology, school of dentistry, shahid beheshti university of medical sciences, tehran, iran sepideh rahimian department of oral and maxillofacial radiology, school of dentistry, shahid beheshti university of medical sciences, tehran, iran mahtab kheirkhahi department of oral and maxillofacial radiology, school of dentistry, semnan university of medical sciences, semnan, iran maryam eslami manouchehri department of oral and maxillofacial radiology, school of dentistry, golestan university of medical sciences, gorgan, iran; department of oral and maxillofacial radiology, school of dentistry, golestan university of medical sciences, gorgan, iran

conclusion this study has highlighted the anatomical variations of npc regarding its dimension, location and morphological appearance. cylindrical was the most common shape followed by funnel-shape, hourglass, and spindle, which were the other canal shapes with less frequency, respectively. the results suggest significant relationship between npc, and gender and dental status. the influence of ...

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