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Methodological considerations in region of interest definitions for paraspinal muscles in axial MRIs of the lumbar spine

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Figure

Fig. 1 T2 weighted axial MR images of the lumbar spine. Images represent Kjaer grade [16] 0 (left), 1 (center), and 2 (right) muscles of the lumbarspine
Fig. 2 Sample region of interest definitions of the erector spinaeand multifidus muscles using Method 1 (yellow) and Method 2 (red)
Fig. 3 Examples of overlapping regions of interest defined by all 3 raters (red), 2 raters (yellow), or 1 rater (blue) for the multifidus muscle usingregion of interest definitions from method 1 (a-c) and method 2 (d-f) for muscles with Kjaer grade 0 (a, d), 1 (b, e), and 2 (c, f)
Table 1 ICC results
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