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 persisted advances within the Siemens Somatom Plus CT know-how and functions over the past four years. advancements in scanning and software program have enabled nice strides to be made towards quick excessive solution, 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 publication provides the sensible adventure of a global professional workforce of radiologists and physicists with many of the significant new advancements in spiral CT akin to dose aid, 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
5 s depending on the cross section of the patient's body. The total mAs product was recorded to determine the respective dose reduction. Four experienced radiologists, blinded as to whether tube modulation was possible in the specific case, compared the two images for a given scan level and determined which was superior in terms of pixel noise, artifact behavior, contrast, and general impression. 3 Results Dose Reduction. The mean difference in dose, measured by the difference in mAs product between scan without and with tube current modulation and expressed as a percentage of the mAs value without current modulation, was 38%, H.
It has to be noted, however, that the mAs settings have to be lowered in order to realize any of the mentioned dose saving. References 1. Davros WJ, Herts BR, Walmsley JJ, Obuchowski NA (1995) Determination of spiral CT slice sensitivity proilles using a point response phantom. J Comp Assist Tomogr 19(5): 838-843 2. Diederich S, Lenzen H, Puskas Z et al (1996) Niedrigdosis-Computertomographie des Thorax. Experimentelle und klinische Untersuchungen. Radiologe 36: 475-482 3. Diederichs CG, Engelke WGH, Richter B, Hermann KP, Oestmann JW (1996) Must radiation dose for CT of the maxilla and mandible be higher than that for conventional panoramic radiography?
Noise in the CT image is dominated by the noise of projection data with highest attenuation. p. projections, without significantly impairing image quality or increasing noise For an object with circular cross-section, attenuation is constant over all projections, and all the measured values contribute equally. For a non circular cross-section, however, attenuation varies strongly, sometimes by more than three orders of magnitude (Fig. 2). , mostly in lateral direction, is decisive for the noise level in the CT image.