Table 2.
Volume, V100, V90, V70, V50, and V20 of planning target volume for left and right breast GRID plans.
| Left case # | Volume (cc) | V100 (%) | V90 (%) | V50 (%) | V20 (%) |
|---|---|---|---|---|---|
| Left breast | |||||
| L1 | 432 | 1.21% | 8.54% | 68.23% | 99.63% |
| L2 | 354 | 2.42% | 10.40% | 68.12% | 99.01% |
| L3 | 1778 | 0.19% | 1.91% | 64.06% | 99.77% |
| L4 | 556 | 2.29% | 9.69% | 68.73% | 99.26% |
| L5 | 954 | 0.23% | 4.36% | 65.16% | 99.34% |
| L6 | 891 | 0.21% | 3.86% | 63.95% | 98.32% |
| Average | 828 | 1.09% | 6.46% | 66.38% | 99.22% |
| Right case # | Right breast | ||||
| R1 | 746 | 0.44% | 6.45% | 66.90% | 99.68% |
| R2 | 1045 | 1.92% | 8.88% | 70.93% | 99.58% |
| R3 | 562 | 2.11% | 9.11% | 68.93% | 99.87% |
| R4 | 1173 | 1.00% | 5.86% | 68.06% | 99.73% |
| R5 | 724 | 2.76% | 10.61% | 69.52% | 99.44% |
| R6 | 553 | 1.21% | 8.08% | 69.30% | 99.42% |
| Average | 801 | 1.57% | 8.17% | 68.94% | 99.62% |
V100, V90, V50, and V20 represent the percentage of PTV volume covered by 100%, 90%, 50%, and 20% of prescription dose, respectively.