23 February 2012 An integrated electronic colon cleansing for CT colonoscopy via MAP-EM segmentation and scale-based scatter correction
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Proceedings Volume 8315, Medical Imaging 2012: Computer-Aided Diagnosis; 83151L (2012); doi: 10.1117/12.910922
Event: SPIE Medical Imaging, 2012, San Diego, California, United States
Abstract
Orally administered tagging agents are usually used in CT colonography (CTC) to differentiate residual bowel content from native colonic structure. However, the high-density contrast agents tend to introduce the scatter effect on neighboring soft tissues and elevate their observed CT attenuation values toward that of the tagged materials (TMs), which may result in an excessive electronic colon cleansing (ECC) where pseudo-enhanced soft tissues are incorrectly identified as TMs. To address this issue, we integrated a scale-based scatter correction as a preprocessing procedure into our previous ECC pipeline based on the maximum a posteriori expectation-maximization (MAP-EM) partial volume segmentation. The newly proposed ECC scheme takes into account both scatter effect and partial volume effect that commonly appear in CTC images. We evaluated the new method with 10 patient CTC studies and found improved performance. Our results suggest that the proposed strategy is effective with potentially significant benefits for both clinical CTC examinations and automatic computer-aided detection (CAD) of colon polyps.
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Hao Zhang, Lihong Li, Hongbin Zhu, Qin Lin, Donald Harrington, Zhengrong Liang, "An integrated electronic colon cleansing for CT colonoscopy via MAP-EM segmentation and scale-based scatter correction", Proc. SPIE 8315, Medical Imaging 2012: Computer-Aided Diagnosis, 83151L (23 February 2012); doi: 10.1117/12.910922; https://doi.org/10.1117/12.910922
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KEYWORDS
Tissues

Image segmentation

Colon

Image processing algorithms and systems

Thulium

Photovoltaics

Computed tomography

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