نتایج جستجو برای: x ray ct

تعداد نتایج: 753974  

2013
Susan Zappala Jonathan R. Helliwell Saoirse R. Tracy Stefan Mairhofer Craig J. Sturrock Tony Pridmore Malcolm Bennett Sacha J. Mooney

X-ray Computed Tomography (CT) is a non-destructive imaging technique originally designed for diagnostic medicine, which was adopted for rhizosphere and soil science applications in the early 1980s. X-ray CT enables researchers to simultaneously visualise and quantify the heterogeneous soil matrix of mineral grains, organic matter, air-filled pores and water-filled pores. Additionally, X-ray CT...

2013
Joseph J. Lifton Andrew A. Malcolm John W. McBride

X-ray computed tomography (CT) is a non-destructive, radiographic scanning technique that enables the visualisation of both the internal geometry and the composition of a workpiece; X-ray CT is therefore well suited for non-destructive inspection tasks. Several physical processes reduce the quality of CT images, and therefore influence both qualitative and quantitative analyses made from CT dat...

2011
Tao

Most CT reconstruction system x-ray computed tomography (CT) is a well established visualization technique in medicine and nondestructive testing. However, since CT scanning requires sampling of radiographic projections from different viewing angles, common CT systems with mechanically moving parts are too slow for dynamic imaging, for instance of multiphase flows or live animals. A large numbe...

Journal: :The Eurasian journal of medicine 2010
M Erdem Sagsoz Fazlı Erdogan Salih Z Erzeneoglu İhsan Yuce

OBJECTIVE X-ray attenuation coefficients are used in common radiological, pathological and spectroscopic examinations and in the determination of the radiation dose distribution in biological tissues. In radiology, these coefficients enable diagnosis by differentiating the abnormal tissues from the normal ones using their morphological structure and contrast differences. In this study, our aim ...

2006
A. Krol J -C. Kieffer R. Toth E. D. Lipson R. E. Kincaid I. L. Coman

We investigated performance of ultrafast (30 fs –200 fs) laser-based x-ray source as an alternative to a microfocal x-ray tube used in micro-CT systems. A number of solid targets including Ge, Mo, Rh, Ag, Sn, Ba, La, Nd with matching filters was used. We optimized conditions for x-rays generation, measured x-ray spectra and obtained images of small animals using various characteristic x-ray lin...

Journal: :Physics in medicine and biology 2015
N Arbor D Dauvergne G Dedes J M Létang K Parodi C T Quiñones E Testa S Rit

Proton computed tomography (CT) has been described as a solution for imaging the proton stopping power of patient tissues, therefore reducing the uncertainty of the conversion of x-ray CT images to relative stopping power (RSP) maps and its associated margins. This study aimed to investigate this assertion under the assumption of ideal detection systems. We have developed a Monte Carlo framewor...

2006
JONGBUM KIM SUNGHEE JUNG JINSUP KIM

With wide industrial application, computerized tomography (CT) is a rapidly developing technique that is especially useful for imaging and measuring multi-component and multi-phase processes. Tomographic measurements can be obtained by using different sensors, such as X-ray, ultrasonic, optical and microwave sensors, as well as electrical impedance electrodes [6]. X-ray, ultrasonic and microwav...

Journal: :Journal of nuclear medicine technology 2005
J Anthony Seibert John M Boone

The purpose is to review in a 4-part series: (i) the basic principles of x-ray production, (ii) x-ray interactions and data capture/conversion, (iii) acquisition/creation of the CT image, and (iv) operational details of a modern multislice CT scanner integrated with a PET scanner. In part 1, the production and characteristics of x-rays were reviewed. In this article, the principles of x-ray int...

Journal: :Undersea & hyperbaric medicine : journal of the Undersea and Hyperbaric Medical Society, Inc 2005
C Q Jiang B Wang C F Yu L W Xiao W W Liu S H Jiao Y Y Liu X Q Lao T H Lam

OBJECTIVE To compare the results of X-ray and CT scan for dysbaric osteonecrosis in Chinese divers. METHODS Both shoulders, hips and knees of 66 asymptomatic divers with diving duration of more than one year were examined by X-ray and CT scan. RESULTS The most frequent locations of dysbaric osteonecrosis were the upper femurs, followed by the upper humerus, lower femurs and upper tibias, an...

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