Automatic colonie polyp detection using multiobjective evolutionary techniques

Jiang Li, Adam Huang, Jianhua Yao, Ingmar Bitter, Nicholas Patrick, Ronald M. Summers, Perry J. Pickhardt, J. Richard Cho

研究成果: 書貢獻/報告類型會議論文篇章同行評審

9 引文 斯高帕斯(Scopus)


Colonie polyps appear like elliptical protrusions on the inner wall of the colon. Curvature based features for colonie polyp detection have proved to be successful in several computer-aided diagnostic CT colonography (CTC) systems. Some simple thresholds are set for those features for creating initial polyp candidates, sophisticated classification scheme are then applied on these polyp candidates to reduce false positives. There are two objective functions, the number of missed polyps and false positive rate, that need to be minimized when setting those thresholds. These two objectives conflict and it is usually difficult to optimize them both by a gradient search. In this paper, we utilized a multiobjective evolutionary method, the Strength Pareto Evolutionary Algorithm (SPEA2),1 to optimize those thresholds. SPEA2 incorporates the concept of Pareto dominance and applies genetic techniques to evolve individual solutions to the Pareto front. The SPEA2 algorithm was applied to colon CT images from 27 patients each having a prone and a supine scan. There are 40 colonoscopically confirmed polyps resulting in 72 positive detections in CTC reading. The results obtained by SPEA2 were compared with those obtained by our old system, where an appropriate value was set for each of those thresholds by a histogram examination method. If we keep the sensitivity the same as that of our old system, the SPEA2 algorithm reduced false positive rate by 76.4% from average false positive 55.6 to 13.3 per data set. If the false positive rate is kept the same for both systems, SPEA2 increased the sensitivity by 13.1% from 53 to 61 among 72 ground truth detections.

主出版物標題Medical Imaging 2006
主出版物子標題Image Processing
出版狀態已出版 - 2006
事件Medical Imaging 2006: Image Processing - San Diego, CA, United States
持續時間: 13 2月 200616 2月 2006


名字Progress in Biomedical Optics and Imaging - Proceedings of SPIE
6144 III


???event.eventtypes.event.conference???Medical Imaging 2006: Image Processing
國家/地區United States
城市San Diego, CA


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