Table 2.
The systematic and random errors and the CTV-to-PTV margins in lateral (x), longitudinal (y) and vertical (z) directions, estimated based on the daily shifts for the 6 imaging modalities.
| IGRT Modality | Systematic Error (Σ) | Random Error (σ) | Margin | ||||||
|---|---|---|---|---|---|---|---|---|---|
| x(mm) | y(mm) | Z(mm) | x(mm) | y(mm) | z(mm) | x(mm) | y(mm) | z(mm) | |
| KVCT | 4.2 | 5.2 | 4.3 | 5.1 | 4.8 | 5.0 | 14.2 | 16.5 | 14.3 |
| KVCB | 3.5 | 1.8 | 5.6 | 3.3 | 2.9 | 4.6 | 11.1 | 6.5 | 17.3 |
| MVCT | 4.0 | 3.1 | 3.3 | 4.2 | 3.8 | 4.9 | 13.0 | 10.4 | 11.7 |
| MVCB | 8.0 | 1.3 | 4.4 | 6.8 | 2.9 | 3.2 | 24.6 | 5.3 | 13.2 |
| KVorth | 4.0 | 2.3 | 3.2 | 4.5 | 4.0 | 4.1 | 13.1 | 8.6 | 10.8 |
| MVorth | 2.7 | 6.5 | 4.0 | 4.5 | 3.8 | 4.4 | 10.0 | 19.0 | 13.0 |