Taywadithep, Kampol. “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, no. 3 (May 25, 2026): 85–91. accessed September 24, 2026. https://he01.tci-thaijo.org/index.php/bulletinAMS/article/view/284426.