نتایج جستجو برای: optical ct scanner

تعداد نتایج: 415472  

Journal: :iranian endodontic journal 0
naghmeh emadi yaser safi alireza akbarzadeh bagheban saeed asgary

introduction: computed tomography (ct) and cone-beam ct (cbct) are valuable diagnostic aids for many clinical applications. this study was designed to compare the gray scale value (gsv) and hounsfield unit (hu) of selected dental materials and various hard tissues using ct or cbct. methods and materials: three samples of all test materials including amalgam (am), composite resin (cr), glass ion...

Journal: :Digital diagnostics 2023

The pandemic of a new coronavirus infection, COVID-19, has challenged the health systems virtually every country in world. Health care administrators had to make quick and effective decisions ensure high quality medical conditions. need form reserve bed fund during was due load on city hospitals Moscow. Due this fact, temporary for COVID-19 patients were organized non-core facilities - ice aren...

2014
Atif N. Khan Faisal Khosa Boris Nikolic Waqas Shuaib Pei-Jan Paul Lin Mohammad K. Khan

OBJECTIVES This study compares cancerogenesis risks posed by the 64 row detector and the 320 row detector computed tomography scanners used during coronary computed tomography angiography (CCTA) following decennial screening guidelines. MATERIAL AND METHODS Data of the radiation absorbed after CCTA by lung, thyroid, and female breast in patients between 50 and 70 years of age obtained from pr...

2010
A Akbarzadeh MR Ay H Ghadiri S Sarkar H Zaidi

PURPOSE The consummate 64-slice CT scanner that spawns a new generation of non-invasive diagnostic tool, however revolutionary, brings with it the incidental by-product that is scattered radiation. The extended detector aperture capability in the 64-slcie CT scanner allows the effects of scattered radiation to be more pronounced and therefore demands that the magnitude and spatial distribution ...

Journal: :AJNR. American journal of neuroradiology 2004
Rajiv Gupta Soenke H Bartling Samit K Basu William R Ross Hartmut Becker Armin Pfoh Thomas Brady Hugh D Curtin

BACKGROUND AND PURPOSE A CT scanner employing a digital flat-panel detector is capable of very high spatial resolution as compared with a multi-section CT (MSCT) scanner. Our purpose was to determine how well a prototypical volume CT (VCT) scanner with a flat-panel detector system defines fine structures in temporal bone. METHODS Four partially manipulated temporal-bone specimens were imaged ...

Journal: :Medical physics 2006
Marc Kachelriess Michael Knaup Willi A Kalender

Phase-correlated CT, as it is used for cardiac imaging, is the most popular and the most important but also the most demanding special CT application in the clinical routine, today. Basically, it fulfills the four-dimensional imaging task of depicting a quasiperiodically moving object at any desired motion phase with significantly reduced motion artifacts. Although image quality with phase-corr...

Journal: :AJNR. American journal of neuroradiology 2000
M Cohnen H Fischer J Hamacher E Lins R Kötter U Mödder

BACKGROUND AND PURPOSE CT is a frequent examination that is performed using ionizing radiation. We sought to assess image-quality changes on CT scans of the head when the radiation dose is reduced by changing tube current and kilovoltage. METHODS A formalin-fixed cadaver was examined in conventional and helical mode by use of two CT-scanners. Surface dose was measured with standard scanning p...

Journal: :Academic radiology 2002
Gabor Fichtinger Theodore L DeWeese Alexandru Patriciu Attila Tanacs Dumitru Mazilu James H Anderson Ken Masamune Russell H Taylor Dan Stoianovici

RATIONALE AND OBJECTIVES The purpose of this study was to assess the work-in-progress prototype of an image-guided, robotic system for accurate and consistent placement of transperineal needles into the prostate with intraoperative image guidance inside the gantry of a computed tomographic (CT) scanner. MATERIALS AND METHODS The coach-mounted system consists of a seven-degrees-of-freedom, pas...

Journal: :Medical physics 2014
Sigal Trattner Bin Cheng Radoslaw L Pieniazek Udo Hoffmann Pamela S Douglas Andrew J Einstein

PURPOSE Effective dose (ED) is a widely used metric for comparing ionizing radiation burden between different imaging modalities, scanners, and scan protocols. In computed tomography (CT), ED can be estimated by performing scans on an anthropomorphic phantom in which metal-oxide-semiconductor field-effect transistor (MOSFET) solid-state dosimeters have been placed to enable organ dose measureme...

2001
Clark J. Gantzer Stephen H. Anderson

Methods for evaluating soil conditions as influenced by tillage are often limited to analysis of bulk samples. The application of medical computed tomography (CT) to the characterization of tillage effects on soil provides an alternative tool for measurement since it is at a more detailed scale. The objective of this study was to compare soils under conventional and notillage (NT) systems using...

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