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

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...

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Bibliographic Details
Main Authors: Boyes, R., Slabaugh, G., Beddoe, G.
Format: Conference Proceeding
Language:English
Subjects:
Attenuation
Colonic polyps
Computed tomography
Convolution
CT colonography
Equations
Filtering
Kernel
Nonlinear filters
pseudo-enhancement artifact
shift-invariant filtering
shift-variant filtering
Tagging
Virtual colonoscopy
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Description
Summary: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.
ISSN:1522-4880
2381-8549
DOI:10.1109/ICIP.2009.5414016