Defining the Optimal Time of Adaptive Replanning in Prostate Cancer Patients with Weight Change during Volumetric Arc Radiotherapy: A Dosimetric and Mathematical Analysis Using the Gamma Index

Table 2

The changes in dosimetric parameters for the rectum (R) and bladder (B) with the changes of body contour from −2.0 cm to 2.0 cm.

		Body contour changes (cm)
		−2.0	−1.5	−1.0	−0.5	0	0.5	1.0	1.5	2.0
6-MV		10.87	10.45	10.06	9.73	9.44	9.24	8.91	8.57	8.30
		14.66	14.34	13.98	13.65	13.39	13.16	13.09	12.54	12.48
10-MV		10.67	10.36	10.08	9.82	9.57	9.36	9.12	8.88	8.64
		14.61	14.33	14.07	13.76	13.59	13.36	13.08	12.79	12.56
15-MV		10.65	10.35	10.06	9.71	9.63	9.40	9.13	8.93	8.70
		14.61	14.34	14.08	13.80	13.63	13.43	13.22	12.91	12.77

, the percentage of the organ volume receiving  Gy or more; , rectum ; , bladder .