3D Segmentation and Quantification of a Masticatory Muscle from MR Data Using Patient-Specific Models and Matching Distributions

被引:14
作者
Ng, H. P. [1 ]
Ong, S. H. [2 ,3 ]
Liu, J. [1 ]
Huang, S. [1 ]
Foong, K. W. C. [4 ,5 ]
Goh, P. S. [6 ,7 ]
Nowinski, W. L. [1 ]
机构
[1] Agcy Sci Technol & Res, Biomed Imaging Lab, Singapore 138671, Singapore
[2] Natl Univ Singapore, Dept Elect & Comp Engn, Singapore 117548, Singapore
[3] Natl Univ Singapore, Div Bioengn, Singapore 117548, Singapore
[4] Natl Univ Singapore, Dept Prevent Dent, Singapore 117548, Singapore
[5] NUS Grad Sch Integrat Sci & Engn, Singapore, Singapore
[6] Natl Univ Singapore, Dept Diagnost Radiol, Singapore 117548, Singapore
[7] Natl Univ Singapore, Dept Diagnost Imaging, Singapore 117548, Singapore
关键词
Segmentation; masseter; masticatory muscle; patient-specific; matching distribution;
D O I
10.1007/s10278-008-9132-1
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 ; 100207 ; 1009 ;
摘要
A method is proposed for 3D segmentation and quantification of the masseter muscle from magnetic resonance (MR) images, which is often performed in pre-surgical planning and diagnosis. Because of a lack of suitable automatic techniques, a common practice is for clinicians to manually trace out all relevant regions from the image slices which is extremely time-consuming. The proposed method allows significant time savings. In the proposed method, a patient-specific masseter model is built from a test dataset after determining the dominant slices that represent the salient features of the 3D muscle shape from training datasets. Segmentation is carried out only on these slices in the test dataset, with shape-based interpolation then applied to build the patient-specific model, which serves as a coarse segmentation of the masseter. This is first refined by matching the intensity distribution within the masseter volume against the distribution estimated from the segmentations in the dominant slices, and further refined through boundary analysis where the homogeneity of the intensities of the boundary pixels is analyzed and outliers removed. It was observed that the left and right masseter muscles' volumes in young adults (28.54 and 27.72cm(3)) are higher than those of older (ethnic group removed) adults (23.16 and 22.13cm(3)). Evaluation indicates good agreement between the segmentations and manual tracings, with average overlap indexes for the left and right masseters at 86.6% and 87.5% respectively.
引用
收藏
页码:449 / 462
页数:14
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