Fig. 2From: Image quality of 4D in-treatment CBCT acquired during lung SBRT using FFF beam: a phantom studyAxial cuts of two modules in the Catphan 503 phantom visualized with regions of interest used for quantitative evaluations of CBCT image quality. The two modules, a CTP404 and b CTP486, were used to calculate the contrast- and uniformity-related metrics, respectivelyBack to article page