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 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 monitors. Radiologists have swiftly carried out into those technical advances the scientific atmosphere for you to increase analysis and sufferer care. This e-book provides the sensible event of a global professional crew of radiologists and physicists with a few of the significant new advancements in spiral CT similar to dose relief, image-guided interventions, information 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
J ip lJh :Jn tom I , , . • . Abd(l'IllI . nm I . """ , ~ " ' 500 C .. \ I o '':: ~ ooo c .... -- 'Hip Phantom' IGem x 36cm oval PMMA + in erts ~ 'Sboulder ~14em Phantom' x 40em elliptic water .. ' ":t. . . _ 50 _... · , , ,, "',"'-'-0 .. 150 o o 200 2'1) ___ . 1 50 'Abdomen Phantom' 20em x 30em oval water 'Quality Phantom ' 20em diameter water Fig. 2. Sketches of the phantoms used in simulations and physical measurements and associated attenuation values as a function of projection angle for the Somatom PLUS 4 at 120 kVp angle are shown in Fig.
Thus we measured noise in two regions of interest (ROIs at opposing sides of the phantom) close to the periphery and two ROIs close to the center of the phantom and averaged the values for each pair of ROIs. Spatial Resolution Measurements. , ). CT number profiles through the center of the bead yield the point spread function in all three spatial dimensions. After signal normalization, this point spread function direct1y converts into the slice sensitivity profIle for the z-direction, while its Fourier transform in the x-direction yields the MTF (within the scan plane).
We examined ten radiation therapy patients scheduled for CT as part of their routine work-up. For these patients four scan levels of the shoulder and upper thorax (the region where the greatest dose reduction was to be expected based on our prior experiments) were examined by single scans without and with tube current modulation. CT was performed without contrast medium to avoid ambiguities. All CT parameters were kept constant: 140 kVp, 5 mm slice thickness, 10 mm increment. Tube current was set to 206 rnA without current modulation and to 274 rnA maximum current for scans with current modulation.
Advances in CT IV: 4th International Scientific User Conference SOMATOM PLUS CT Rotterdam, March 1998 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.)