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 persevered advances within the Siemens Somatom Plus CT expertise and purposes during the last four years. advancements in scanning and software program have enabled nice strides to be made towards fast excessive solution, volumetric imaging and 3D screens. Radiologists have swiftly applied into those technical advances the scientific surroundings in an effort to increase analysis and sufferer care. This ebook offers the sensible adventure of a world professional crew of radiologists and physicists with a few of the significant new advancements in spiral CT similar to dose relief, image-guided interventions, facts postprocessing, and lots of more.
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Extra info for Advances in CT IV: 4th International Scientific User Conference SOMATOM PLUS CT Rotterdam, March 1998
2 Phantom Experiments Noise Measurements. For the measurement of the influence of slice collimation, raw data interpolation, pitch factor, and reconstruction algorithm, we performed measurements using circular water phantoms of 10 cm, 20 cm, and 30 cm in diameter. Our standard parameter set was as follows: 120kVp, 3-mm slice collimation, pitch 1, 1 s tube rotation, an AB50 fIlter kernel, and "slim2'~ raw data interpolation. A 30-cm phantom was used if not mentioned otherwise. Depending on the experiment, various scan parameters were altered.
4 if 140 kVp was used instead of 120 kVp, while the CTDI air fell by a factor of 4 when 80 kVp was employed. 2 Individualizing mAs Setting Image noise increases exponentially with increasing phantom diameter (Fig. 2). From the slope of the curve, the half layer (for noise) can be determined. 1 cm at 3-mm slice collimation. The numbers decrease with lower mAs, lower kVp, and narrower slice collimation. 5 cm were found for the clinically relevant choices of scan parameters. 3 Slice Collimation As can be expected from theory, image noise decreased with increasing slice collimation (SC) (Fig.
Online attenuation-based tube current modulation using the square root of attenuation as the control parameter appears to be the method of choice. The only deficiency at present is the amplitude of tube current modulation, which is still limited. The use of grid-controlled X-ray tubes which allow faster modulation of tube current would be a potential solution. In addition to the patients receiving W. A. : 34 Dose Reduction in CT less exposure, X-ray tubes will also profit from our approach since tube load is decreased to the same proportion as patient dose.