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Multidetector-Row CT of the Thorax (Medical Radiology by M.F. Reiser (Foreword), U. J. Schoepf (Editor)

By M.F. Reiser (Foreword), U. J. Schoepf (Editor)

With the arrival of multidetector-row expertise, pleasure has again to computed tomography. not just will we now snapshot speedier and with larger answer than ever earlier than. extra importantly, the advance of subtle picture acquisition ideas has enabled us to enterprise into parts formerly thought of to be past the scope of CT imaging. the data, event, and imaginative and prescient of a bunch of well known overseas specialists in state of the art thoracic purposes of multidetector-row CT are condensed inside of this booklet. the result's a serious, finished evaluation of the radical possibilities, but in addition the hot demanding situations, caused by way of the improvement of ever-faster CT acquisition options. provides the newest advancements in CT imaging of the thorax Comprehensively reports the literature bargains invaluable functional directions Addresses either possibilities and demanding situations Written by means of best overseas specialists  

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Manufacturers have devised beam-tracking systems to stabilize the position of the X-ray beam to minimize the radiation wasting effect of focal spot motion (Toth et al. 2000). Scattered radiation is formed by the interaction of the primary beam with the patient. Scattered radiation exits in all directions and, if detected, reduces contrast and generates artifacts. In plain chest radiography, depending on the technique chosen, Radiation Exposure in Thoracic CT between 50 and 90% of film darkening is due to scattered radiation, contributing to the low soft tissue contrast of this technique (Curry et al.

17. To maintain complete volume coverage, image sub-volumes reconstructed in consecutive heart cycles have to fit together in the transverse direction. As a consequence, the spiral pitch has to be limited for ECG-gated multi-slice CT examinations of the heart (Ohnesorge et al. 2000). If the table moves too fast, gaps between the image sub-volumes occur, which have to be closed by far-reaching interpolations at the expense of a loss of transverse resolution and a degradation of the SSPs. In theory, the spiral pitch could be adapted to the patient’s heart rate.

T. Flohr et al. for a larger number of slices. Simulated CT data of an anthropomorphic heart phantom with contrastenhanced coronary arteries containing atherosclerotic plaques and stents was used to investigate the limits of the ACV approach for scanning with significantly more than 4 slices. 18 shows two cross sections along the right and the left coronary artery (RCA and LAD) of the mathematical heart phantom: this is the “ideal image” which serves as a quality benchmark. 375 (table feed 3 mm/s).

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