Figure 2. 3D rendered ground truth image.

The 3D modeled ground truth images used for the training dataset of the automatic segmentation model, showcasing the classification of thigh muscles into 30 distinct classes grouped as anterior, medial, gluteal, posterior and else. Anterior group: sartorius, rectus femoris and vastus muscles (lateralis, intermedius and medius). Medial group: adductor muscles (magnus, brevis and longus), gracilis and pectineus. Gluteal region: gluteus muscles (maximus, medius and minimus), fascia lata, piriformis, quadratus femoris, obturator internus and obturator externus. In Posterior group: semitendinosus, semimembranosus and biceps femoris. Else group: iliacus, iliopsoas, psoas, abdominal oblique, rectus abdominis, multifidus, femur, iliac and background.