A comparison of three approaches for defining nucleus pulposus and annulus fibrosus on sagittal MR images.
Yi-Xiang Wang 1 , Greta SP Mok 2 , Duo Zhang 2 , Shu-Zhong Chen 1 , and Jing Yuan 3
Dept Imaging and Interventional Radiology,
The Chinese University of Hong Kong, Shatin, NT, Hong
of Electrical and Computer Engineering, University of
Macau, Macau SAR, Macau,
Physics and Research Department, Hong Kong Sanatorium &
Hospital, Happy Valley, Hong Kong
We compared three region-of-interest (ROI) methods for
nucleus pulposus (NP) and annulus fibrosus (AF).
Fifty-two subjects were imaged under a 3-T MRI and a
total of 256 discs were evaluated using manual and
uniform ROI methods to define NP and AF. The intra-class
correlation coefficient (ICC) values were all >0.75 when
comparing 5-/7-ROI with manual ROI methods for NP, and
0.167-0.488 for AF when comparing 7-ROI with M-ROI
method. The values increased to 0.378-0.582 for 5-ROI
method. Comparable results were obtained with
Bland-Altman plots. The uniform ROI methods agreed well
with manual ROI for NP but not for AF.
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