Systematic Measurement of Membranous Urethral Length Using a Cross-Reference System: A Study on Interrater Variability

Purpose

To evaluate the effectiveness of a cross-reference system (CRS) in improving the reproducibility of membranous urethral length (MUL) measurements by reducing the interrater variability. Materials and Methods: A total of 100 patients who underwent robot-assisted radical prostatectomy (RARP) and preoperative MRI were enrolled. MUL measurements were independently performed by two urologists with different levels of experience, both before and after CRS implementation. The radiological reference MUL served as the baseline for comparison. Interrater variability and agreement with the radiological reference were assessed.