Table 1.
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.