Table 3.
Comparison of patient-specific QA results between SRS MapCHECK and ArcCHECK for 4 different groups. The difference is statistically significant if a p value is <0.05.
| Group A: SRS DCAT† | ||||||||
|---|---|---|---|---|---|---|---|---|
| Gamma criteria | 3%/3 mm | 3%/2 mm | 2%/2 mm | 2%/1 mm | ||||
| QA device | SRS MC* |
AC° | SRS MC | AC | SRS MC | AC | SRS MC | AC |
| Gamma passing rate (mean ± SD) (%) | 100 | 99.96 ± 0.29 | 100 | 99.88 ± 0.52 | 99.95 ± 0.47 |
99.79 ± 0.75 |
99.54 ± 1.71 |
96.44 ± 3.56 |
| Statistically significantly different? (Y/N) | unavailable | unavailable | Y (p value = 0.0269) |
Y (p value <0.0001) |
||||
| Total No. of detectors irradiated (mean ± SD) | SRS MC: 178.0 ± 57.8; AC: 61.0 ± 29.7 | |||||||
| Group B: SRS VMAT‡ | ||||||||
| Gamma criteria | 3%/3 mm | 3%/2 mm | 2%/2 mm | 2%/1 mm | ||||
| QA device | SRS MC |
AC | SRS MC | AC | SRS MC | AC | SRS MC | AC |
| Gamma passing rate (mean ± SD) (%) | 99.79 ± 0.48 | 99.42 ± 1.40 | 99.16 ± 1.09 | 98.60 ± 2.34 | 98.42 ± 1.76 | 98.00 ± 2.60 | 93.71 ± 4.95 | 90.64 ± 5.68 |
| Statistically significantly different? (Y/N) | N (p value = 0.0599) |
N (p value = 0.1762) |
N (p value = 0.3264) |
Y (p value = 0.0013) |
||||
| Total No. of detectors irradiated (mean ± SD) | SRS MC: 246.7 ± 110.7; AC: 62.0 ± 26.5 | |||||||
| Group C: SBRT DCAT | ||||||||
| Gamma criteria | 3%/3 mm | 3%/2 mm | 2%/2 mm | 2%/1 mm | ||||
| QA device | SRS MC |
AC | SRS MC | AC | SRS MC | AC | SRS MC | AC |
| Gamma passing rate (mean ± SD) (%) | 100 | 100 | 100 | 99.80 ± 0.36 |
100 | 97.60 ± 2.41 |
100 | 86.39 ± 8.69 |
| Statistically significantly different? (Y/N) | unavailable | unavailable | unavailable | unavailable | ||||
| Total No. of detectors irradiated (mean ± SD) | SRS MC: 506.4 ± 135.6; AC: 263.4 ± 99.4 | |||||||
| Group D: SBRT VMAT | ||||||||
| Gamma criteria | 3%/3 mm | 3%/2 mm | 2%/2 mm | 2%/1 mm | ||||
| QA device | SRS MC |
AC | SRS MC | AC | SRS MC | AC | SRS MC | AC |
| Gamma passing rate (mean ± SD) (%) | 99.91 ± 0.35 | 99.82 ± 0.34 | 99.83 ± 0.64 | 99.71 ± 0.51 | 99.57 ± 1.13 | 99.00 ± 1.17 | 98.38 ± 3.27 | 93.60 ± 4.57 |
| Statistically significantly different? (Y/N) | N (p value = 0.0637) |
N (p value = 0.0917) |
Y (p value = 0.0030) |
Y (p value <0.0001) |
||||
| Total No. of detectors irradiated (mean ± SD) | SRS MC: 536.3 ± 119.6; AC: 180.8 ± 86.2 | |||||||
*SRS MapCHECK
°ArcCHECK
†Dynamic conformal arc therapy
‡Volumetric modulated arc therapy