Novel MRI‐Guided Ultrasound Equations for Whole‐Body Muscle Mass in Caucasian Adults

The equations developed in this study enable accurate estimation of whole-body muscle mass in a Caucasian population using ultrasound. A practical, time-efficient equation with fewer variables is available alongside a more detailed equation that provides higher accuracy. Importantly, models that combine muscle thickness and CSA measurements demonstrated improved prediction accuracy (higher adjusted R² and lower SEE) compared to those using muscle thickness alone, supporting the inclusion of CSA in future applications.