Fast Pseudo-enhancement Correction In Ct Colonography Using Linear Shift-invariant Filters

This paper presents a novel method to approximate shiftvariant Gaussian filtering of an image using a set of shiftinvariant 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 pseudoenhancement 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.

• Type: Conference
• Year: 2009
• Where: ICIP
• Keywords: CT Colonography Application, ICIP 2009, Image Processing, Shiftinvariant Gaussian Filters, Shiftvariant Gaussian Filtering