Table 2.
Sensitivity and specificity of the Mobius3D recalculation as compared to institutional IMRT QA for failing phantom plans. The independent recalculation was consistently more sensitive to detecting unacceptable plans.
| Device | # tests | # failing results | % Sensitivity | % Specificity | ||||
|---|---|---|---|---|---|---|---|---|
| IMRT QA | Mobius3D | Sig. | IMRT QA | Mobius3D | Sig. | |||
| All | 337 | 18 | 6 | 72 | ** | 98 | 68 | ** |
| EPID | 58 | 7 | 0 | 71 | * | 100 | 57 | ** |
| ArcCheck | 93 | 4 | 0 | 100 | * | 100 | 70 | ** |
| Ion Chamber | 44 | 1 | 0 | 100 | 91 | 67 | * | |
| IC + Array | 29 | 0 | N/A | N/A | 93 | 62 | * | |
| MapCheck | 121 | 5 | 20 | 40 | 100 | 67 | ** | |
*
Significant (0.001–0.05);
**
Highly significant (< 0.001).