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A semiautomatic algorithm for three-dimensional segmentation of the prostate on CT images using shape and local texture characteristics
Author(s): Maysam Shahedi; Ling Ma; Martin Halicek; Rongrong Guo; Guoyi Zhang; David M. Schuster; Peter Nieh; Viraj Master; Baowei Fei
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Paper Abstract

Prostate segmentation in computed tomography (CT) images is useful for planning and guidance of the diagnostic and therapeutic procedures. However, the low soft-tissue contrast of CT images makes the manual prostate segmentation a time-consuming task with high inter-observer variation. We developed a semi-automatic, three-dimensional (3D) prostate segmentation algorithm using shape and texture analysis and have evaluated the method against manual reference segmentations. In a training data set we defined an inter-subject correspondence between surface points in the spherical coordinate system. We applied this correspondence to model the globular and smoothly curved shape of the prostate with 86, well-distributed surface points using a point distribution model that captures prostate shape variation. We also studied the local texture difference between prostate and non-prostate tissues close to the prostate surface. For segmentation, we used the learned shape and texture characteristics of the prostate in CT images and we used a set of user inputs for prostate localization. We trained our algorithm using 23 CT images and tested it on 10 images. We evaluated the results compared with those of two experts’ manual reference segmentations using different error metrics. The average measured Dice similarity coefficient (DSC) and mean absolute distance (MAD) were 88 ± 2% and 1.9 ± 0.5 mm, respectively. The averaged inter-expert difference measured on the same dataset was 91 ± 4% (DSC) and 1.3 ± 0.6 mm (MAD). With no prior intra-patient information, the proposed algorithm showed a fast, robust and accurate performance for 3D CT segmentation.

Paper Details

Date Published: 12 March 2018
PDF: 8 pages
Proc. SPIE 10576, Medical Imaging 2018: Image-Guided Procedures, Robotic Interventions, and Modeling, 1057616 (12 March 2018); doi: 10.1117/12.2293195
Show Author Affiliations
Maysam Shahedi, Emory Univ. School of Medicine (United States)
Ling Ma, Emory Univ. (United States)
Martin Halicek, Georgia Institute of Technology & Emory Univ. School of Medicine (United States)
Rongrong Guo, Emory Univ. (United States)
Guoyi Zhang, Emory Univ. (United States)
David M. Schuster, Emory Univ. (United States)
Peter Nieh, Emory Univ. (United States)
Viraj Master, Emory Univ. (United States)
Baowei Fei, Emory Univ. (United States)


Published in SPIE Proceedings Vol. 10576:
Medical Imaging 2018: Image-Guided Procedures, Robotic Interventions, and Modeling
Baowei Fei; Robert J. Webster, Editor(s)

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