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Automatic Prostate Segmentation in MR Images based on Active Shape Model Using Intensity Distribution and Gradient Information  

Jang, Yu-Jin (서울여자대학교 컴퓨터학과)
Hong, Helen (서울여자대학교 미디어학부)
Abstract
In this paper, we propose an automatic segmentation of the prostate using intensity distribution and gradient information in MR images. First, active shape model using adaptive intensity profile and multi-resolution technique is used to extract the prostate surface. Second, hole elimination using geometric information is performed to prevent the hole from occurring by converging the surface shape to the local optima. Third, the surface shape with large anatomical variation is corrected by using 2D gradient information. In this case, the corrected surface shape is often represented as rugged shape which is generated by the limited number of vertices. Thus, it is reconstructed by using surface modelling and smoothing. To evaluate our method, we performed the visual inspection, accuracy measures and processing time. For accuracy evaluation, the average distance difference and the overlapping volume ratio between automatic segmentation and manual segmentation by two radiologists are calculated. Experimental results show that the average distance difference was 0.3${\pm}$0.21mm and the overlapping volume ratio was 96.31${\pm}$2.71%. The total processing time of twenty patient data was 16 seconds on average.
Keywords
Automatic Segmentation; Active Shape Model; Shape Information; Geometry Information; Gradient Information; Prostate; MRI;
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