Fig. 4
From: Image quality of 4D in-treatment CBCT acquired during lung SBRT using FFF beam: a phantom study
Quantitative metrics to evaluate the 3D-reconstructed in-treatment Catphan CBCT image quality plotted vs. the tube current: a contrast, b contrast-to-noise ratio, c overall uniformity, and d minimum uniformity. The in-treatment CBCT acquisition and image quality analysis were performed for different acquisition modes (partial-arc vs. full-arc) and different MV treatment beam energy values (6 vs. 10 MV FFF). The image quality metrics for the pretreatment CBCT acquired with the vendor-recommended Symmetry protocol are represented as dashed lines in each graph