Fig. 5From: Image quality of 4D in-treatment CBCT acquired during lung SBRT using FFF beam: a phantom studyScatter plots of the a contrast, b contrast-to-noise ratio, c overall uniformity, and d minimum uniformity calculated using the Catphan phantom against the monitor units. The CBCT image quality metrics were compared between the tube currents of 20 and 40 mA. The Pearson correlation coefficients r and corresponding p-values p are presentedBack to article page