Taywadithep, K. 2026. Comparison of radiation and light field congruence between a developed collimator test tool and a standard collimator test tool in the general X-ray units of Lamphun Province hospitals. Journal of Associated Medical Sciences. 59, 3 (May 2026), 85–91. DOI:https://doi.org/10.66285/JAMS.2026.081.