Advances in CT II: 2nd European Scientific User Conference by P. A. Gevenois, P. De Vuyst, M. Littani, J. Zanen, P. de

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 probabilities 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 lower than part a minute make radiological prognosis extra exact. Blind gaps are not any longer a big challenge, and all buildings, particularly within the lungs, will be pointed out and clinically determined. the sensible event of a professional groupof scientific researchers and physicists is now made to be had during this book.

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In order to produce images, noise must be kept to a minimum. The Siemens So- matom Plus has a reproducibility better than ± 2 HU for a 256 x 256 matrix. 2. Movement must be ideally kept to less than pixel dimensions. Movement in the plane of the image can be corrected for by software techniques, but movement perpendicular to the image plane cannot be corrected for without full threedimensional imaging. X-ray Computed Tomography Perfusion Imaging 47 Applications Liver There has long been keen interest in the perfusion characteristics of hepatic parenchyma and focal hepatic lesions.

Early experience suggests that the technique is of limited value in the normal brain, where the blood-brain barrier is intact. However, as in all cranial CT enhanced studies, it should be practical in lesions which have led to a defect in the blood-brain barrier. Again, perfusion characteristics before and after various interventions could be assessed. Conclusion The technique we have demonstrated is but one of the many functional imaging techniques available to a radiologist. Functional imaging has long been available from nuclear medicine where the wide choice of radiopharmaceuticals gives a corresponding wide range of functional images.

Peripheral hilar structures are not reproducibly imaged, moving in and out of the slice during data sampling. One of the best and oldest ways to cope with motion in imaging is to reduce the exposure time. 7-s scan time 32 M. Oudkerk et al. Fig. I. 0-s scan with streak artifacts in the area of the pericardium and pulmonary trunk, arteries, and aortic root. 7-s scan at the same level, in the same patient as in a, no artifacts are detected a b Fig. 2. 0-s scan with streak artifacts in the area of the pericardium, aortic root, and left atrium.

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