J Med Phys Close
 

Figure 4: Different regions of interest (ROI) overlaid on the portal images of the sweeping gap fields (a) 4 × 4 pixels ROI in the interleaf region (b) and (c) ROI (70 × 19 pixels) for 0.6 cm 3 ionization chamber with parallel and perpendicular orientations with respect to direction of sweeping beam

Figure 4: Different regions of interest (ROI) overlaid on the portal images of the sweeping gap fields (a) 4 × 4 pixels ROI in the interleaf region (b) and (c) ROI (70 × 19 pixels) for 0.6 cm <sup>3</sup> ionization chamber with parallel and perpendicular orientations with respect to direction of sweeping beam