By L. Van Hoe, S. Van De Straete, H. Bosmans, G. Marchal (auth.), Gabriel P. Krestin M.D., Ph.D., Gary M. Glazer M.D. (eds.)
There were endured advances within the Siemens Somatom Plus CT expertise and functions during the last four years. advancements in scanning and software program have enabled nice strides to be made towards quick excessive answer, volumetric imaging and 3D screens. Radiologists have quickly carried out into those technical advances the medical surroundings to be able to enhance prognosis and sufferer care. This e-book offers the sensible adventure of a global professional crew of radiologists and physicists with the various significant new advancements in spiral CT reminiscent of dose relief, image-guided interventions, facts postprocessing, and plenty of more.
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Additional info for Advances in CT IV: 4th International Scientific User Conference SOMATOM PLUS CT Rotterdam, March 1998
Greess et al. 38 Fig. 2a, b. Scan of the shoulder region in patient 9. aStandard scan. b Scan with current modulation. The dose was reduced by 47% in the scan with current modulation. Low contrast resolution is better in the scan without current modulation (arrows). However, the spinal canal is depicted more clearly in the scan with current modulation a b Fig. 3a, b. Scan of the shoulder region in patient 2. a Standard scan. b Scan with current modulation. The dose was reduced by 43% in the scan with current modulation.
A mean dose reduction of 38% was recorded, which is in good agreement with theoretical predictions  and phantom and cadaver studies (Chap. 4). It is difficult in a patient study to determine whether image quality differs in scans without and with tube current modulation. p. views. Subjective assessment of pixel noise by four radiologists blinded to whether tube current modulation was activated or not confirmed to a large extent that our initial goal was achieved. 2). In spite of the significant reduction in dose, an improvement in the noise structure was observed, in particular a reduction of structured noise in the spinal canal.
Hence there is a one-to-one relationship between slice location as defined by the X-ray beam shining on the patient, the table position, and an image location. This one-to-one correspondence does not have meaning in spiral CT. In spiral CT data are collected in a continuous fashion and form a spiral around the patient's long axis. After the projection data are collected, the user indicates to the reconstruction computer where along the spiral of raw data images are to be reconstructed. It is only then that the reconstruction computer selects the projections needed to reconstruct an image at each selected location.