TABLE II.
Summary of the dosimetric results for the planning target volumes
| Parameter | (A) 3D-CRT | (B) IMRT | (C) RapidArca | p Valueb | ||
|---|---|---|---|---|---|---|
|
| ||||||
| A vs. B | A vs. C | B vs. C | ||||
| V95% (%) | 99.70±0.41 | 99.96±0.04 | 99.97±0.04 | 0.046 | 0.046 | 0.707 |
| V110% (%) | 8.56±5.24 | 0.46±0.29 | 0.23±0.18 | 0.001 | 0.001 | 0.382 |
| Dmax (Gy) | 56.43±0.45 | 56.08±0.48 | 56.37±0.85 | 0.210 | 0.816 | 0.371 |
| Dmean (Gy) | 53.61±0.29 | 52.99±0.24 | 53.05±0.01 | 0.001 | 0.000 | 0.409 |
| Conformity index | 0.72±0.06 | 0.84±0.03 | 0.88±0.05 | 0.000 | 0.001 | 0.036 |
| Homogeneity index | 1.09±0.01 | 1.07±0.01 | 1.06±0.01 | 0.001 | 0.000 | 0.120 |
| Monitor units | 290.4±18.93 | 630.02±62.14 | 565.07±76.12 | 0.000 | 0.000 | 0.028 |
| Delivery time (min) | 0.97±0.06 | 2.10±0.21 | 1.05±0.10 | 0.000 | 0.095 | 0.000 |
a
Varian Medical Systems, Palo Alto, CA, U.S.A.
b
By paired t-test analysis.
3D-CRT = 3-dimensional conformal radiotherapy; IMRT = intensity-modulated radiotherapy; Vx% = volume receiving x% or more of the prescribed dose; Dmax = maximum dose to the organ; Dmean = mean dose to the organ.