Fig. 1

Cross-sectional analysis of the gluteus medius and bone mineral reference phantom for adjustment of CT density. a and b Cross sectional area (colored area in panel b) was measured using the mid-point of the anterior superior iliac spine and greater trochanter, which were visualized using cross-sectional images obtained by CT (dot line in panel a). c A calibration phantom (B-MAS 200; Kyoto-Kagaku, Kyoto, Japan) is placed in a CT scanner and an equivalent amount of hydroxyapatite in the bone mineral reference phantom was utilized to adjust CT density by using dedicated software