Electronic Stool Subtraction Using Quadratic Regression, Morphological Operations, and Distance Transforms
文献类型: 会议论文
第一作者: Michael Carston
作者: Michael Carston 1 ; Armando Manduca; C. Daniel Johnson; SPIE-The International Society for Optical Engineering;
作者机构: 1.Biomathematics Resource Mayo Clinic College of Medicine 200 1st St. S.W., Rochester, MN, USA 55905;Dept. of Diagnostic Radiology Mayo Clinic College of Medicine 200 1st St. S.W., Rochester, MN, USA 55905
关键词: colon;cancer;colonography;colonoscopy;CT;electronic stool subtraction;stool tagging;colon cleansing
会议名称: SPIE vol.6511 pt.1; Conference on Medical Imaging 2007: Physiology, Function, and Structure from Medical Images pt.1; 20070218-20; San Diego,CA(US)
主办单位:
页码: 65110W.1-65110W.12
摘要: CT colonography (CTC) is being extensively studied for its potential value in colon examinations, since it offers many advantages such as lower risk and less patient discomfort. However, CTC, like all other types of full structural colorectal examinations to date, requires complete bowel preparation. The inconvenience and discomfort associated with this preparation is an important obstacle to compliance with currently recommended colorectal screening guidelines. To maximize compliance, CTC would ideally be performed on an unprepared colon. However, in an unprepared colon residual stool and fluid can mimic soft tissue density and thus confound the identification of polyps. An alternative is to tag the stool with an opacifying agent so that it is brighter than soft tissue and thus easily recognized automatically and then reset to air values. However, such electronic stool subtraction in a totally unprepared colon is difficult to perform accurately for several reasons, including poorly labeled areas of stool, the need to accurately quantify partial volume effects, and noise. In this study the qualitative performance of a novel stool subtraction algorithm was assessed in unprepared CT colonography screening exams of 26 consecutive volunteers. Results showed that nearly all stool was removed in 62% of the cases, fold erosion was mild or nonexistent in 75% of the cases, and wall erosion was mild or non-existent in 100% of cases. Although further study and refinement of the stool subtraction process is required, CT colonography of the unprepared colon with electronic stool subtraction is feasible.
分类号: R318.51
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