Figure 1

Edge-enhanced and non-enhanced fluence of VMAT. The fluences with non-edge-enhancement of prostate (a) and head and neck (H&N) volumetric modulated arc therapy (VMAT) plans (c) are shown. Those fluences were generated by whole integration of every monitor units (MUs) shaped by multi-leaf collimator (MLC) apertures at each control point (CP). The fluences with edge-enhancement of prostate (b) and H&N VMAT plans (d) are also shown. For edge-enhancement of fluences, when integrating MUs, the values of pixels (size of 1 mm × 1 mm) representing MLC tips were doubled.