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Proceedings Paper

Elimination of blooming artifacts off stents by dual energy CT
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Paper Abstract

A method to remove stents and consequently to eliminate the blooming artifacts off the stents is proposed in dual energy CT. The method could also reduce the blooming artifacts off calcified plaques. A phantom study is performed to test the method. The phantom consists of a stainless steel stent and a dumbbell shaped plastic (Delrin) cylinders. With the dual energy technique and the knowledge of the stent material, we separate the stent from the Delrin at each image voxels accurately. The large and small diameters of the Delrin are measured from the images by the full width at half maximum as 2.8 mm and 1.4 mm, respectively. They are very close to the true values of 2.4 mm and 1.2 mm. By respectively discarding even and odd view data for the low and high voltages, we simulate the fast kV-switching acquisitions where one view mis-registration exists between the low/high voltage scans. Comparing with the original images by the slow kV-switching where a perfect registration is realized between the low/high voltage scans, the images from the fast kVswitching show no significant differences except for the noise pattern.

Paper Details

Date Published: 12 March 2009
PDF: 8 pages
Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 72581X (12 March 2009); doi: 10.1117/12.811696
Show Author Affiliations
Yu Zou, Toshiba Medical Research Institute USA (United States)
Michael D. Silver, Toshiba Medical Research Institute USA (United States)

Published in SPIE Proceedings Vol. 7258:
Medical Imaging 2009: Physics of Medical Imaging
Ehsan Samei; Jiang Hsieh, Editor(s)

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