Radiotorax.es: a web-based tool for formative self-assessment in chest X-ray interpretation

Radiotorax.es is a free, non-profit web-based tool designed to support formative self-assessment in chest X-ray interpretation. This article presents its structure, educational applications, and usage data from 11 years of continuous operation. Users complete interpretation rounds of 20 clinical cases, compare their reports with expert evaluations, and conduct a structured self-assessment. From 2011 to 2022, 14,389 users registered, and 7,726 completed at least one session. Most were medical students (75.8%), followed by residents (15.2%) and practicing physicians (9.0%). The platform has been integrated into undergraduate medical curricula and used in various educational contexts, including tutorials, peer and expert review, and longitudinal tracking. Its flexible design supports self-directed learning, instructor-guided use, and multicenter research. As a freely accessible resource based on real clinical cases, Radiotorax.es provides a scalable, realistic, and well-received training environment that promotes diagnostic skill development, reflection, and educational innovation in radiology education.