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 1
The changes in dosimetric parameters for (a) planning target volume coverage and (b) conformity and homogeneity indices with changes in body contour from −2.0 cm to 2.0 cm.
(a) Planning target volume coverage (%)
Body contour changes (cm)
−2.0
−1.5
−1.0
−0.5
0
0.5
1.0
1.5
2.0
6-MV
103.08
102.33
101.49
100.66
100.00
99.28
98.31
97.35
96.34
110.74
108.94
107.34
106.06
105.36
104.72
104.06
103.52
103.00
10-MV
102.83
101.83
101.13
100.51
100.00
99.48
98.81
98.04
97.39
108.78
107.50
106.32
105.48
105.02
104.68
104.06
103.56
103.12
15-MV
102.22
101.66
101.05
100.46
100.00
99.52
98.93
98.30
97.68
108.72
107.56
106.50
105.62
105.12
104.60
104.02
103.54
103.12
: the percentage of the prescription dose covering of the volume. Italic font: unacceptable.
