Figure 2.

(A) Axial lumbar spine muscle segmentations at the L4 vertebral level from manual segmentation and an automated computer-vision model overlaid over a spin-echo T₂-weighted image. (B) Three-dimensional renderings of the lumbar spine muscle segmentations. The muscle groups segmented include the multifidus (left = light orange, right = dark orange), erector spinae (left = light blue, right = dark blue), and psoas major (left = light green, right = dark green). L = left, R = right, A = anterior, P = posterior, S = superior, I = inferior. Adapted from Wesselink et al., 2022 [6].