hydatid disease is a parasitic infestation caused by the larval form of echinococcus gronulosus and it remains a considerable public health problem in several mediterranean countries such as iran. liver is the most common site of involvement. lungs are the second most common sites of hematogeneous spread in adults and are probably the most common sites in children (15% - 25% of cases). primary ...

X-ray computed tomography (CT) can reveal the internal details of objects in three dimensions non-destructively. In this Primer, we outline basic principles CT and describe ways which a scan be acquired using tubes synchrotron sources, including different possible contrast modes that exploited. We explain process computationally reconstructing three-dimensional (3D) images from 2D radiographs h...

In the ANR DROITE project, the laboratories TIMC-IMAG, LHC and CREATIS (located in Rhône-Alps region, respectively in Grenoble, St-Étienne and Lyon) open a two years post-doc fellowship on the mathematics and numerics of Dynamic ROI Cone Beam (CB) Computed Tomography (CT). Computed tomography aims at reconstructing images of internal physical quantities (attenuation coefficients, radioactivity ...

– gafchromic xrct radiochromic film is a self developing high sensitivity radiochromic filmproduct which can be used for assessment of delivered radiation doses which could match applications suchas computed tomography (ct) dosimetry. the dose response of gafchromic xrct radiochromic film hasbeen measured with reflectance spectrophotometry and desktop scanners. the film automatically changescol...

X-ray computed tomography (CT), introduced into clinical practice in 1972, was the first of the modern slice-imaging modalities. To reconstruct images mathematically from measured data and to display and to archive them in digital form was a novelty then and is commonplace today. CT has shown a steady upward trend with respect to technology, performance and clinical use independent of predictio...

Quantitative Computed Tomography or “QCT” is a fast, non-invasive bone mineral density (BMD) exam of the lumbar spine or proximal femur, which utilizes low dose scan protocols on a standard Computed Tomography (CT) scanner. Originally developed in the early 80’s, QCT has several advantages over Dual-energy X-ray Absorptiometry (DXA) for the measurement of BMD in patients with degenerative disea...

Overexposures in computed tomography: In several institutions, overexposures have occurred during use of x-ray computed tomography (CT) for brain perfusion studies to identify 10 the neurological consequences of strokes and other events. In some cases, patients received exposures that were several times greater than necessary. The overexposures were caused by use of inappropriate CT protocols f...

A synergy of positron emission tomography (PET)/computed tomography (CT) scanners is the use of the CT data for x-ray-based attenuation correction of the PET emission data. Current methods of measuring transmission use positron sources, gamma-ray sources, or x-ray sources. Each of the types of transmission scans involves different trade-offs of noise versus bias, with positron transmission scan...

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 ...