Table 1.
Mean measured doses (μmeas ± σ) and mean TPS-calculated doses (μcalc ± σ) for all TLD data for each phantom slice and for all phantom slices. The standard deviation (σ) is reported as one standard deviation of the mean. This value is dominated by the spread of doses across each phantom slice as compared to an additional standard uncertainty in each TLD measurement of ≤3%.
| Phantom slice | Distance from field edge (cm) | Count | μcalc, cGy/GyRx (σ) | μmeas, cGy/GyRX (σ) | Mean TPS underestimation of measured dose (σ) | |||
|---|---|---|---|---|---|---|---|---|
| 21 | 3.75 | 56 | 3.08 | (0.61) | 4.24 | (0.45) | 28% | (17%) |
| 22 | 6.25 | 59 | 2.02 | (0.43) | 3.01 | (0.24) | 32% | (12%) |
| 23 | 8.75 | 62 | 1.16 | (0.32) | 2.09 | (0.14) | 44% | (15%) |
| 24 | 11.25 | 61 | 0.66 | (0.33) | 1.49 | (0.13) | 55% | (23%) |
| All slices | N/A | 238 | 1.7 | (1.01) | 2.65 | (1.05) | 40% | (20%) |
cGy/GyRx: cGy per prescribed Gy.