Mixed

Computed Tomography (CT) imaging at the L3 vertebra is a gold-standard, accurate, and precise method for assessing skeletal muscle cross-sectional area and visceral adipose tissue, allowing for the estimation of whole-body composition from single cross-sectional images.

For patients already undergoing CT scans for medical reasons (like cancer or ICU care), the images can be used to accurately assess muscle mass and fat distribution at the L3 vertebra level. This 'opportunistic' use provides critical nutritional data without exposing the patient to additional radiation.