Statistical shape model of a liver for autopsy imaging
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- 作者：Atsushi Saito (1)
Akinobu Shimizu (1)
Hidefumi Watanabe (1)
Seiji Yamamoto (2)
Shigeru Nawano (3)
Hidefumi Kobatake (4) - 关键词：Statistical shape model ; Liver ; Autopsy imaging ; Synthesized ; based learning ; Level set ; PCA
- 刊名：International Journal of Computer Assisted Radiology and Surgery
- 出版年：2014
- 出版时间：March 2014
- 年：2014
- 卷：9
- 期：2
- 页码：269-281
- 全文大小：1,850 KB
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Akinobu Shimizu (1)
Hidefumi Watanabe (1)
Seiji Yamamoto (2)
Shigeru Nawano (3)
Hidefumi Kobatake (4)
1. Tokyo University of Agriculture and Technology, Koganei, Tokyo, Japan
2. Ai Information Center, Chuo-ku, Tokyo, Japan
3. Department of Radiology, International University of Health and Welfare, Mita Hospital, Minato-ku, Tokyo, Japan
4. Institute of National Colleges of Technology, Hachioji, Tokyo, Japan - ISSN：1861-6429
文摘
Purpose ???Modeling the postmortem liver for autopsy imaging is a challenging problem owing to the variation in organ deformation found in cadavers and limited availability of postmortem liver CT scans. An algorithm was developed to construct a statistical shape model (SSM) for the adult postmortem liver in autopsy imaging. Methods ???First, we investigated the relationship between SSMs obtained from in vivo liver CT scans and those from postmortem cases. Liver shapes were embedded in level set functions and statistically modeled using a spatially weighted principal components analysis. The performance of the SSMs was evaluated in terms of generalization and specificity. Several algorithms for the transformation from in vivo livers to postmortem livers were proposed to enhance the performance of an SSM for a postmortem liver, followed by a comparative study on SSMs. Specifically, five SSMs for a postmortem liver were constructed and evaluated using 32 postmortem liver labels, and postmortem liver labels synthesized from 144 in vivo liver labels were constructed using the proposed transformation algorithms. We also compared the proposed SSMs with three conventional SSMs trained from postmortem liver labels and/or in vivo liver labels. Results ???The investigation showed that the performance of an SSM constructed using in vivo liver labels suffered when describing postmortem liver shapes. Two of the five proposed SSMs trained using synthesized postmortem livers showed the best performance with no significant differences between them, and they statistically outperformed all conventional SSMs tested. Conclusions ???The performance of conventional SSMs can be improved by using both postmortem liver shape labels and artificial shape labels synthesized from in vivo liver shape labels.