By P. A. Gevenois, P. De Vuyst, M. Littani, J. Zanen, P. de Franquen, J. C. Yernault (auth.), Professor Dr. R. Felix, Professor Dr. M. Langer (eds.)
Significant improvement made within the Siemens CT scanner SOMATOM PLUS have opened new chances for diagnostic imaging in computed tomography. Spiral CT with a continously rotating X-ray tube and synchronous desk increments for as much as 60 cm in below part a minute make radiological prognosis extra actual. Blind gaps are not any longer a huge challenge, and all buildings, specially within the lungs, could be pointed out and clinically determined. the sensible adventure of knowledgeable groupof scientific researchers and physicists is now made to be had during this book.
Read or Download Advances in CT II: 2nd European Scientific User Conference SOMATOM PLUS, Berlin, March 1992 PDF
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Additional resources for Advances in CT II: 2nd European Scientific User Conference SOMATOM PLUS, Berlin, March 1992
In 11 of 18 examinations, the stomach and bowel were opacified with meglumine diatrizoate. The initial examination was performed with standard CT (10 mm spacing and 10 mm slice thickness, 210 rnA), and follow-up examinations with SVCT (10 mmls, 165 rnA); the interpolated data were reconstructed at 10 mm intervals. Magnetic resonance (MR) images were available for comparison. The volume scans were obtained with a commercially available, continuously rotating Somatom Plus scanner (Siemens Medical Systems, Erlangen, FRG).
Thus, ga can be simply calculated as the maximum value of Ca(t). In dynamic CT, Ca and Ct represent the contrast density in the artery and organ. Interpolation techniques are used to create a smoothly varying curve. 2). 3. The initial 'retention' phase represents the 'filling' of the capillaries in the tissue element. If this tissue element has as its input Clt), the tissue TDC is as shown in Fig. 2. 2. Time-density curve for the artery and an organ following injection of iodinated contrast material 0 0 10 20 30 40 50 60 40 50 60 Time (s) 100 80 ~ c 0 ~ 60 2 ~ c '" OJ 0 40 20 Fig.
Enhancement of ACVG after the injection of contrast material is the criterion of graft patency. CT with a discontinuous rotating tube requires a stepby-step comparison of precontrast and postcontrast scans. Using this approach, the sensitivity and specificity in the evaluation of graft patency are limited due to variations of the volume inspired and ex spired by the patient. The mode of continuous acquisition during table movement (spiral CT) provides complete scanning of a selected patient volume during one breath hold.
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