Investig Magn Reson Imaging.  2020 Sep;24(3):123-131. 10.13104/imri.2020.24.3.123.

Optimization of Multi-Atlas Segmentation with Joint Label Fusion Algorithm for Automatic Segmentation in Prostate MR Imaging

Affiliations
  • 1Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul, Korea
  • 2Department of Radiology and Center for Imaging Science, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
  • 3Department of Medical Device Management and Research, SAIHST, Sungkyunkwan University, Seoul, Korea
  • 4Department of Digital Health, SAIHST, Sungkyunkwan University, Seoul, Korea

Abstract

Purpose
Joint label fusion (JLF) is a popular multi-atlas-based segmentation algorithm, which compensates for dependent errors that may exist between atlases. However, in order to get good segmentation results, it is very important to set the several free parameters of the algorithm to optimal values. In this study, we first investigate the feasibility of a JLF algorithm for prostate segmentation in MR images, and then suggest the optimal set of parameters for the automatic prostate segmentation by validating the results of each parameter combination.
Materials and Methods
We acquired T2-weighted prostate MR images from 20 normal heathy volunteers and did a series of cross validations for every set of parameters of JLF. In each case, the atlases were rigidly registered for the target image. Then, we calculated their voting weights for label fusion from each combination of JLF’s parameters (rpxy , rpz , rsxy , rsz , β). We evaluated the segmentation performances by five validation metrics of the Prostate MR Image Segmentation challenge.
Results
As the number of voxels participating in the voting weight calculation and the number of referenced atlases is increased, the overall segmentation performance is gradually improved. The JLF algorithm showed the best results for dice similarity coefficient, 0.8495 ± 0.0392; relative volume difference, 15.2353 ± 17.2350; absolute relative volume difference, 18.8710 ± 13.1546; 95% Hausdorff distance, 7.2366 ± 1.8502; and average boundary distance, 2.2107 ± 0.4972; in parameters of rpxy = 10, rpz = 1, rsxy = 3, rsz = 1, and β = 3.
Conclusion
The evaluated results showed the feasibility of the JLF algorithm for automatic segmentation of prostate MRI. This empirical analysis of segmentation results by label fusion allows for the appropriate setting of parameters.

Keyword

Prostate; Magnetic resonance imaging; Multi-atlas based segmentation; Joint label fusion; Automatic prostate segmentation
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