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Proceedings Paper

Sensitivities for CT imaging of contrast agents in a thorax/myocardium phantom
Author(s): Joseph Fryar; Neil J. O'Hare; D. J. Dowsett
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Paper Abstract

A phantom. having similar dimensions to a heart in the human thorax, has been used to determine the sensitivity of X-ray CT scanning for the imaging of contrast agents within the myocardiuin. A theoretical determination of sensitivity has been made for elements from Z=35 to Z=92 for both monochromatic and polychromatic beams. For the monochromatic beams, calculations were made for single energy studies in which the contrast agent was added after an initial scan and for dual energy studies where differential absorption across a K or L absorption edge is used. Simulated images, in which Poisson noise was added to the projection data, have been generated for various elements in the range Z=35 to 92, with particular attention being paid to iodine, gadolithum, tungsten and gold for monochromatic and polychromatic beams. For monochromatic beams the simulated images are compared with the theoretical predictions. The phantom, imaged in a Somatom-2 scanner (with a 256x256 display) has been used to test the accuracy of the results for a polychromatic beam. Results show that the maximum sensitiyity will occur in the region of Z=64 (gadolinium).

Paper Details

Date Published: 1 July 1990
PDF: 9 pages
Proc. SPIE 1231, Medical Imaging IV: Image Formation, (1 July 1990); doi: 10.1117/12.18802
Show Author Affiliations
Joseph Fryar, Dublin City Univ. (Ireland)
Neil J. O'Hare, Dublin City Univ. (Ireland)
D. J. Dowsett, Mater Misericordiae Hospital (Ireland)

Published in SPIE Proceedings Vol. 1231:
Medical Imaging IV: Image Formation
Roger H. Schneider, Editor(s)

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