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Inter-subject comparison of MRI knee cartilage thickness
BibTeX
@MISC{Carballido-gamio_inter-subjectcomparison,
author = {Julio Carballido-gamio and Jan S. Bauer and Robert Stahl and Keh-yang Lee and Stefanie Krause and M. Link and Sharmila Majumdar},
title = {Inter-subject comparison of MRI knee cartilage thickness},
year = {}
}
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Abstract
In this paper, we present the development and application of current image processing techniques to perform MRI inter-subject comparison of knee cartilage thickness based on the registration of bone structures. Each point in the bone surface which is part of the bone–cartilage interface is assigned a cartilage thickness value. Cartilage and corresponding bone structures are segmented and their shapes interpolated to create isotropic voxels. Cartilage thicknesses are computed for each point in the bone– cartilage interfaces and transferred to the bone surfaces. Corresponding anatomic points are then computed for bone surfaces based on shape matching using 3D shape descriptors called shape contexts to register bones with affine and elastic transformations, and then perform a point to point comparison of cartilage thickness values. An alternative technique for cartilage shape interpolation using a morphing technique is also presented. The cartilage segmentation and morphing were validated visually, based on volumetric measurements of porcine knee images which cartilage volumes were measured using a water displacement method, and based on digital thickness values computed with an established technique. Shape matching using 3D shape contexts was validated visually and against manual shape matching performed by a radiologist. The reproducibility of intra-and inter-subject cartilage thickness comparisons was established, as well as the feasibility of using the proposed technique to build a mean femoral shape, cartilage thickness map, and cartilage coverage map. Results showed that the proposed technique is robust, accurate, and reproducible to perform point to point inter-subject comparison of knee cartilage thickness values.
Keyphrases
inter-subject comparison bone surface mri knee cartilage thickness bone structure bone cartilage interface shape context cartilage thickness value manual shape digital thickness value volumetric measurement intra-and inter-subject cartilage thickness comparison isotropic voxels shape descriptor cartilage shape interpolation mri inter-subject comparison cartilage segmentation morphing technique knee cartilage thickness value water displacement method porcine knee image cartilage thickness map mean femoral shape knee cartilage thickness elastic transformation cartilage thickness cartilage coverage map alternative technique anatomic point current image processing technique
