Head-And-Neck(66Gy/33#)
Grid Sizes(mm)
Cases 3.0 5.0 10.0
  V95% V107% V110% V95% V107% V110% V95% V107% V110%
Case1 96.18% 1.39% 0.13% 96.03% 1.85% 0.25%   95.01% 1.78 0.09%
Case2 95.55% 0.11% 0.00% 95.45% 0.96% 0.03%   95.22% 0.15% 0.00%
Case3 95.07% 1.23% 0.06% 95.72% 3.24% 0.66%   95.40% 2.75% 0.00%
Case4 95.56% 0.30% 0.00% 95.05% 1.85% 0.39% 95.22% 0.59% 0.00%
Avg. 95.59% 0.76% 0.05% 95.56% 1.98% 0.33% 95.21% 1.32% 0.02%
Std.Dev 0.2470 0.5690 0.6180 0.4030 0.9410 0.2630 0.1590 0.118 0.420
(a)
Pelvis(Carcinoma Cervix)[50Gy/25#]
Grid Sizes(mm)
Cases 3.0 5.0 10.0
  V95% V107% V110% V95% V107% V110% V95% V107% V110%
Case1 97.79% 0.31% 0.00% 97.75% 0.38% 0.00% 96.86% 0.17% 0.00%
Case2 96.07% 0.27% 0.00% 96.09% 0.17% 0.00% 96.13% 0.99% 0.00%
Case3 95.58% 0.84% 0.00% 95.59% 0.23% 0.00% 95.49% 1.00% 0.00%
Case4 96.02% 0.20% 0.01% 95.26% 0.08% 0.00% 95.14% 0.65% 0.30%
Avg. 96.37% 0.41% 0.00% 96.17% 0.22% 0.00% 95.91% 0.70% 0.08%
Std.Dev 0.9751 0.2924 0.0050 1.1056 0.1260 0.0000 0.7572 0.3905 0.15
(b)
Brain(54Gy/27#)
Grid Sizes(mm)
Cases 3.0 5.0 10.0
  V95% V107% V110% V95% V107% V110% V95% V107% V110%
Case1 98.33% 0.00% 0.00% 98.56% 0.27% 0.00% 96.16% 0.95% 0.15%
Case2 96.80% 1.13% 0.00% 96.08% 1.39% 0.00% 95.02% 3.25% 0.37%
Case3 95.41% 1.42% 0.00% 95.30% 3.22% 0.02% 95.31% 2.55% 0.00%
Case4 95.15% 2.34% 0.20% 95.17% 2.97% 0.25% 95.44% 2.19% 0.16%
Avg. 96.42% 1.22% 0.05% 96.28% 1.96% 0.07% 95.48% 2.24% 0.17%
Std.Dev 1.4634 0.9645 0.0946 1.5738 1.3890 0.1220 0.4845 0.8340 0.152
(c)
Table 1: (a), (b) and (c) shows target volume averaged dose parameters at CT with varying grid sizes for different sites viz. Head & Neck, Pelvis & Brain. Values are presented as a percentage of Dpres of PTV.