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American Journal of Roentgenology, Vol 164, 1525-1531, Copyright © 1995 by American Roentgen Ray Society

ARTICLES

Variable-mode helical CT: imaging protocols

MM Tomiak, WD Foley and DR Jacobson
Department of Radiology, University of Chicago Hospitals, IL 60037, USA.

Helical CT provides a rapidly acquired, accurately registered, two- dimensional data set during the phase of maximum vascular and parenchymal enhancement. The z-axis can be covered by using either a single acquisition, single breath-hold technique or by using multiple helical groups with intergroup delays for the patient's breathing. The latter approach, called variable-mode helical CT, allows large z-axis coverage of more than one anatomic region during injection of a single bolus of contrast material. We discuss helical scanning protocols, both single-acquisition and variable-mode, that we have developed for detection of disease involving major blood vessels (pulmonary arteries and aorta), perivascular tissue planes (neck, thorax, and pelvis), and abdominal viscera (liver, pancreas, and kidneys).
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Copyright © 1995 by the American Roentgen Ray Society.