Table 3 The 1-D systematic study results of the gamma method and the IOA for the local normalization
From: To propose adding index of achievement (IOA) to IMRT QA process
|  | Intentional Dose Error => | 0% |  | + 1% |  | + 2% |  | + 3% | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Intentional Spatial Error | Model => | A | B | C | Â | A | B | C | Â | A | B | C | Â | A | B | C | |
0Â mm | Gamma pass | 4%/4Â mm | 100.0 | 100.0 | 100.0 | Â | 100.0 | 100.0 | 100.0 | Â | 99.0 | 100.0 | 98.3 | Â | 99.0 | 100.0 | 98.3 |
3%/3Â mm | 100.0 | 100.0 | 100.0 | Â | 100.0 | 100.0 | 100.0 | Â | 99.0 | 100.0 | 98.3 | Â | 99.0 | 100.0 | 98.3 | ||
rate (%) | 2%/2Â mm | 100.0 | 100.0 | 100.0 | Â | 100.0 | 100.0 | 100.0 | Â | 99.0 | 100.0 | 98.3 | Â | 59.3 | 35.3 | 98.3 | |
1%/1Â mm | 100.0 | 100.0 | 100.0 | Â | 100.0 | 100.0 | 100.0 | Â | 0 | 33.6 | 0 | Â | 0 | 33.6 | 0 | ||
IOA | Value | 1.000 | 1.000 | 1.000 | Â | 1.077 | 1.034 | 1.099 | Â | 1.154 | 1.068 | 1.199 | Â | 1.231 | 1.101 | 1.298 | |
Rank | 1 | 1 | 1 | Â | 2 | 2 | 2 | Â | 5 | 3 | 5 | Â | 8 | 4 | 8 | ||
1Â mm | Gamma pass | 4%/4Â mm | 100.0 | 100.0 | 100.0 | Â | 100.0 | 100.0 | 100.0 | Â | 99.0 | 100.0 | 98.3 | Â | 99.0 | 100.0 | 98.3 |
3%/3Â mm | 100.0 | 100.0 | 100.0 | Â | 100.0 | 100.0 | 100.0 | Â | 99.0 | 100.0 | 98.3 | Â | 99.0 | 100.0 | 98.3 | ||
rate (%) | 2%/2Â mm | 100.0 | 100.0 | 100.0 | Â | 100.0 | 100.0 | 100.0 | Â | 69.8 | 100.0 | 49.6 | Â | 30.2 | 35.3 | 49.6 | |
1%/1Â mm | 100.0 | 100.0 | 100.0 | Â | 70.4 | 84.0 | 50.4 | Â | 29.6 | 17.6 | 49.6 | Â | 29.6 | 17.6 | 49.6 | ||
IOA | Value | 1.128 | 1.164 | 1.165 | Â | 1.149 | 1.167 | 1.193 | Â | 1.200 | 1.177 | 1.258 | Â | 1.264 | 1.192 | 1.341 | |
Rank | 3 | 5 | 3 | Â | 4 | 6 | 4 | Â | 6 | 7 | 6 | Â | 10 | 8 | 10 | ||
2Â mm | Gamma pass | 4%/4Â mm | 100.0 | 100.0 | 100.0 | Â | 100.0 | 100.0 | 100.0 | Â | 99.0 | 100.0 | 98.3 | Â | 99.0 | 100.0 | 98.3 |
3%/3Â mm | 100.0 | 100.0 | 100.0 | Â | 100.0 | 100.0 | 100.0 | Â | 72.9 | 100.0 | 54.6 | Â | 69.8 | 100.0 | 50.4 | ||
rate (%) | 2%/2Â mm | 100.0 | 100.0 | 100.0 | Â | 70.4 | 84.0 | 51.3 | Â | 69.8 | 84.0 | 50.4 | Â | 30.7 | 19.3 | 50.4 | |
1%/1Â mm | 40.2 | 67.2 | 0.8 | Â | 40.2 | 67.2 | 0.8 | Â | 30.2 | 1.7 | 49.6 | Â | 30.2 | 1.7 | 49.6 | ||
IOA | Value | 1.225 | 1.286 | 1.290 | Â | 1.250 | 1.294 | 1.323 | Â | 1.294 | 1.305 | 1.379 | Â | 1.349 | 1.320 | 1.451 | |
Rank | 7 | 9 | 7 | Â | 9 | 10 | 9 | Â | 11 | 11 | 11 | Â | 14 | 12 | 14 | ||
3Â mm | Gamma pass | 4%/4Â mm | 100.0 | 100.0 | 100.0 | Â | 100.0 | 100.0 | 100.0 | Â | 77.4 | 100.0 | 62.2 | Â | 69.8 | 100.0 | 51.3 |
3%/3Â mm | 100.0 | 100.0 | 100.0 | Â | 70.9 | 84.0 | 52.1 | Â | 69.8 | 84.0 | 51.3 | Â | 69.8 | 84.0 | 51.3 | ||
rate (%) | 2%/2Â mm | 40.7 | 67.2 | 1.7 | Â | 40.2 | 67.2 | 1.7 | Â | 69.8 | 67.2 | 50.4 | Â | 31.2 | 3.4 | 50.4 | |
1%/1Â mm | 39.7 | 66.4 | 1.7 | Â | 39.7 | 66.4 | 0.8 | Â | 1.0 | 1.7 | 0.8 | Â | 1.0 | 1.7 | 0.8 | ||
IOA | Value | 1.318 | 1.404 | 1.411 | Â | 1.347 | 1.415 | 1.448 | Â | 1.389 | 1.428 | 1.503 | Â | 1.441 | 1.443 | 1.570 | |
Rank | 12 | 13 | 12 | Â | 13 | 14 | 13 | Â | 15 | 15 | 15 | Â | 16 | 16 | 16 | ||