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12 March 2009 Elimination of blooming artifacts off stents by dual energy CT
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Proceedings Volume 7258, Medical Imaging 2009: Physics of Medical Imaging; 72581X (2009)
Event: SPIE Medical Imaging, 2009, Lake Buena Vista (Orlando Area), Florida, United States
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.
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Yu Zou and Michael D. Silver "Elimination of blooming artifacts off stents by dual energy CT", Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 72581X (12 March 2009);

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