Ultrasound-based area ossification ratios for pediatric radiographic bone age: Development and internal validation of a radiation-free nomogram.
PURPOSE Radiographic bone age (BA) assessment involves ionizing radiation, limiting its utility in frequent longitudinal follow-up. This study developed and internally validated a radiation-free nomogram based on multi-site two-dimensional ultrasound area ossification ratios (ORs) to assess Zhonghua-05 (RUS-CHN) radiog...