Table 1.
The differences between expected absolute doses (predicted by the TPS) and absolute doses measured in our ion chamber phantom (second and third columns) for each patient's treatment plan. The shapes of the dose distributions were verified based on the number of diodes satisfying MapCHECK's gamma criterion (fourth column). Finally, we compare the MapCHECK dose on the central axis to its predicted value (fifth and sixth columns). Summary statistics of these measures are given in the bottom rows.
| Absolute Dose | Mapcheck | ||||
|---|---|---|---|---|---|
| Patient | Expected | Measured | Passing | Measured | Expected |
| 1 | 228.9 | 224.2 | 100 | 78.3 | 75.85 |
| 2 | 235.8 | 235.8 | 100 | 92.33 | 97.45 |
| 3 | 206.2 | 205.4 | 97.9 | 121.81 | 121.62 |
| 4 | 391.5 | 380.5 | 98.5 | 124.45 | 124.75 |
| 5 | 232.6 | 238 | 96.9 | 158.78 | 161.95 |
| 6 | 254.6 | 250.4 | 99.5 | 119.87 | 122.52 |
| 7 | 241.1 | 242.3 | 95.2 | 92.86 | 76.1 |
| 8 | 200.7 | 195.4 | 96 | 82.86 | 75.42 |
| 9 | 214 | 217.9 | 97 | 82.98 | 81.27 |
| 10 | 215.5 | 209.3 | 96.3 | 48.1 | 44.96 |
| 11 | 160.4 | 163.1 | 95.8 | 92.7 | 93.73 |
| 12 | 203.2 | 204.3 | 97.6 | 108.21 | 108.43 |
| 13 | 283.6 | 282.3 | 99.7 | 284.35 | 297.97 |
| 14 | 281.8 | 279.4 | 95.5 | 80.26 | 78.99 |
| 15 | 236.2 | 227.1 | 97.2 | 127.1 | 113.93 |
| 16 | 359.6 | 354.7 | 96.3 | 45.01 | 32.85 |
| 17 | 445.9 | 442.4 | 98.5 | 75.86 | 73.21 |
| MEAN | 258.3294 | 256.0294 | 97.52353 | 106.8135 | 104.7647 |
| S.D | 72.62554 | 70.79058 | 1.562626 | 52.48433 | 57.05988 |