Role of frailty and sarcopenia in predicting outcomes among patients undergoing gastrointestinal surgery

Figure 3 Define sarcopenia rather than a single axial image. A: Total psoas area is measured by circling both psoas muscles at the level of the patients computed tomography where both iliac crests are visible; B: Total psoas volume is measured at the full length of the psoas muscles and normalized for the patients body surface area. Used with permission Amini et al[47], 2015.