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Fast pseudo-enhancement correction in CT colonography using linear shift-invariant filters

Boyes, R., Slabaugh, G. G. & Beddoe, G. (2009). Fast pseudo-enhancement correction in CT colonography using linear shift-invariant filters. In: 16th IEEE International Conference on Image Processing (ICIP), 2009. (pp. 2509-2512). IEEE. doi: 10.1109/ICIP.2009.5414016


This paper presents a novel method to approximate shift-variant Gaussian filtering of an image using a set of shift-invariant Gaussian filters. This approximation affords filtering of the image using fast convolution techniques that rely on the FFT, while achieving a result that closely matches the shift-variant result. We demonstrate the method in a CT colonography application that reduces the pseudo-enhancement effect, which is a local brightening artifact in CT imaging that can result from the use of oral contrast agents. Experimental results demonstrate the effectiveness of the method and emphasize its computational efficiency.

Publication Type: Book Section
Additional Information: © 2009 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Publisher Keywords: CT colonography, pseudo-enhancement artifact, shift-variant filtering, shift-invariant filtering
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
R Medicine > RC Internal medicine
Departments: School of Science & Technology > Computer Science
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