Dual-Energy electronic cleansing for artifact-free visualization of the colon in fecal-tagging CT colonography

Authors:
Wenli Cai;June-Goo Lee;Se Hyung Kim;Hiroyuki Yoshida
Affiliations:
Massachusetts General Hospital and Harvard Medical School, Boston;Massachusetts General Hospital and Harvard Medical School, Boston;Seoul National University College of Medicine, Seoul, South Korea;Massachusetts General Hospital and Harvard Medical School, Boston
Venue:
MICCAI'11 Proceedings of the Third international conference on Abdominal Imaging: computational and Clinical Applications
Year:
2011

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Abstract

The partial volume effect (PVE) is one of the major causes of the artifacts in electronic cleansing (EC) for fecal-tagging CT colonography (CTC). In this study, we developed a novel dual-energy EC (DC-EC) scheme for minimizing the EC artifacts caused by the PVE. In our approach, the colonic lumen, including air and tagged fecal materials, was first marked by a dual-energy index (DEI). The high DEI value of air and tagged fecal materials provides a means to efficiently differentiate the voxels at the boundary between air and tagged materials from those of the soft-tissue structures that have the DEI value of around zero. As a result, the colonic lumen, including air and tagged materials, could be accurately segmented based on their high DEI values. Our DE-EC scheme was shown to provide an electronically cleansed colon that is free from artifacts caused by the PVE at the air-tagging boundary.