Assessing lumbar paraspinal muscle cross-sectional area and fat composition with T1 versus T2-weighted magnetic resonance imaging: Reliability and concurrent validity
Fig 2
Different measurement procedure examples.
A: Histogram outlining process. B: Histogram from A. Small white box indicates the region of intersection of the green histogram line with the X-axis at “0”. Note: to identify the point at which the histogram curve contacted the X-axis to the nearest value of 10, one must zoom in on the histogram within the sliceOmatic program. The inset box shows the point of intersection of the green histogram line with the X-axis, indicated by the blue line. In this example, the cut-off point would be 170. C: Overlapped T1-weighted and T2-weighted total cross-sectional area outlines for visual comparison. D: Fat (bright green/pale green) and muscle (red/purple) tissue highlighted, with related measurement outcomes [surf. measures (cm2) apply].