نتایج جستجو برای: megavoltage cone beam computed tomography

تعداد نتایج: 397607  

Journal: :Computer methods and programs in biomedicine 2010
Peter B. Noël Alan M. Walczak Jinhui Xu Jason J. Corso Kenneth R. Hoffmann Sebastian Schafer

The use of cone beam computed tomography (CBCT) is growing in the clinical arena due to its ability to provide 3D information during interventions, its high diagnostic quality (sub-millimeter resolution), and its short scanning times (60 s). In many situations, the short scanning time of CBCT is followed by a time-consuming 3D reconstruction. The standard reconstruction algorithm for CBCT data ...

2010

Conventional (both chemical and digital) radiography renders a three-dimensional (3-D) anatomical structure two dimensionally with inherit distortions. This limitation posts a steep learning curve for novice operators to interpret information from the resulting images. In many incidences, it becomes a matter of guesswork even to the experienced user, like the relationship of the maxillary molar...

2017
Cheol-Woo Park Jin-ho Kim Yu-Kyeong Seo Sae-Rom Lee Ju-Hee Kang Song-Hee Oh Gyu-Tae Kim Yong-Suk Choi Eui-Hwan Hwang

PURPOSE This study was performed to investigate the influence of object shape and distance from the center of the image on the volumetric accuracy of cone-beam computed tomography (CBCT) scans, according to different parameters of tube voltage and current. MATERIALS AND METHODS Four geometric objects (cylinder, cube, pyramid, and hexagon) with predefined dimensions were fabricated. The object...

Journal: :Dental clinics of North America 2014
Kenneth Abramovitch Dwight D Rice

At the end of the millennium, cone-beam computed tomography (CBCT) heralded a new dental technology for the next century. Owing to the dramatic and positive impact of CBCT on implant dentistry and orthognathic/orthodontic patient care, additional applications for this technology soon evolved. New software programs were developed to improve the applicability of, and access to, CBCT for dental pa...

2016
Lawrence Lechuga Georg A. Weidlich

A comparison of image quality and dose delivered between two differing computed tomography (CT) imaging modalities-fan beam and cone beam-was performed. A literature review of quantitative analyses for various image quality aspects such as uniformity, signal-to-noise ratio, artifact presence, spatial resolution, modulation transfer function (MTF), and low contrast resolution was generated. With...

Journal: :dental research journal 0
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background: cross- sectional tomograms have been used for optimal pre-operative planning of dental implant placement. the aim of the present study was to assess the accuracy of cone beam computed tomography (cbct) measurements of specifi c distances around the mandibular canal by comparing them to those obtained from multi-slice computed tomography (msct) images. materials and methods: ten hemi...

Journal: :International Endodontic Journal 2014

Journal: :Journal of Contemporary Dentistry 2012

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