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Proceedings Paper

Suppression of high-density artifacts in x-ray CT images using temporal digital subtraction with application to cryotherapy
Author(s): Roustem Baissalov; George A. Sandison; Bryan J. Donnelly; John C. Saliken; Ken Muldrew; John C. Rewcastle
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Paper Abstract

Image guidance of cryotherapy is usually performed using ultrasound or x-ray CT. Despite the ability of CT to display the full 3D structure of the iceball, including frozen and unfrozen regions, the quality of the images is compromised by the presence of high density streak artifacts. To suppress these artifacts we applied Temporal Digital Subtraction (TDS). This TDS method has the added advantage of improving the gray scale contrast between frozen and unfrozen tissue in the CT images. Two sets of CT images were taken of a phantom material, cryoprobes and a urethral warmer (UW) before and during the cryoprobe freeze cycle. The high density artifacts persisted in both image sets. TDS was performed on these two image sets using the corresponding mask image of unfrozen material and the same geometrical configuration of the cryoprobes and the UW. The resultant difference image had a significantly reduced content of the artifacts. This TDS can be used in x-ray CT assisted cryotherapy to significantly suppress or eliminate high density x-ray CT streak artifacts by digitally processing x-ray CT images. Applying TDS in cryotherapy will facilitate estimation of the amount and location of all frozen and unfrozen regions, potentially making cryotherapy safer and less operator dependent.

Paper Details

Date Published: 6 June 2000
PDF: 6 pages
Proc. SPIE 3979, Medical Imaging 2000: Image Processing, (6 June 2000); doi: 10.1117/12.387622
Show Author Affiliations
Roustem Baissalov, Tom Baker Cancer Ctr. and Univ. of Calgary (Canada)
George A. Sandison, Tom Baker Cancer Ctr. and Univ. of Calgary (Canada)
Bryan J. Donnelly, Tom Baker Cancer Ctr. (Canada)
John C. Saliken, Tom Baker Cancer Ctr. and Foothills Hospital (Canada)
Ken Muldrew, Univ. of Calgary (Canada)
John C. Rewcastle, Tom Baker Cancer Ctr. and Univ. of Calgary (Canada)


Published in SPIE Proceedings Vol. 3979:
Medical Imaging 2000: Image Processing
Kenneth M. Hanson, Editor(s)

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