Accurate Segmentation of CT Male Pelvic Organs via Regression-Based Deformable Models and Multi-Task Random Forests

IEEE Transactions on Medical Imaging
Yaozong GaoDinggang Shen

Abstract

Segmenting male pelvic organs from CT images is a prerequisite for prostate cancer radiotherapy. The efficacy of radiation treatment highly depends on segmentation accuracy. However, accurate segmentation of male pelvic organs is challenging due to low tissue contrast of CT images, as well as large variations of shape and appearance of the pelvic organs. Among existing segmentation methods, deformable models are the most popular, as shape prior can be easily incorporated to regularize the segmentation. Nonetheless, the sensitivity to initialization often limits their performance, especially for segmenting organs with large shape variations. In this paper, we propose a novel approach to guide deformable models, thus making them robust against arbitrary initializations. Specifically, we learn a displacement regressor, which predicts 3D displacement from any image voxel to the target organ boundary based on the local patch appearance. This regressor provides a non-local external force for each vertex of deformable model, thus overcoming the initialization problem suffered by the traditional deformable models. To learn a reliable displacement regressor, two strategies are particularly proposed. 1) A multi-task random forest is prop...Continue Reading

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Citations

May 15, 2018·IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society· Zhensong Wang Dinggang Shen
Jul 6, 2017·IEEE Transactions on Medical Imaging·Marie BiethBjoern Menze
Nov 23, 2018·Physics in Medicine and Biology·Meghan W MacomberMatthew J Nyflot
Dec 14, 2018·Physics in Medicine and Biology·Anjali BalagopalSteve Jiang
Nov 26, 2020·Journal of Applied Clinical Medical Physics·Marta CasatiStefania Pallotta
Jan 11, 2020·Computerized Medical Imaging and Graphics : the Official Journal of the Computerized Medical Imaging Society·Wei ShaoUNKNOWN Alzheimer's Disease Neuroimaging Initiative
Jan 20, 2021·Artificial Intelligence in Medicine·Jian ZhangDinggang Shen
Sep 21, 2020·Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)·Takafumi NemotoNaoyuki Shigematsu
May 13, 2021·Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)·Ana Barragán-MonteroJohn A Lee
Jul 14, 2021·Radiological Physics and Technology·Takafumi NemotoNaoyuki Shigematsu
Sep 16, 2021·Biomedical Physics & Engineering Express·Zhuangzhuang ZhangBaozhou Sun

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