TABLE II.
Characterization of real-time treatment pauses per fraction (pause rate) and magnitude of shifts required for patient re-alignment. A treatment pause was defined as any stop during treatment to either re-align the patient (triggered by the real time tumor tracking system) or to adjust the gating thresholds. The means were compared using ANOVA. BMI = Body Mass Index, PTV = Planning Target Volume
| Cohort | Treatment Pauses (#/fx) | Re-alignment shifts (mm) | ||||
|---|---|---|---|---|---|---|
| Pause Rate | p | Median | StDev | p | ||
| All Patients | 0.81 | 5.2 | 2.9 | |||
| Technique | <0.001 | 0.65 | ||||
| Gating | 1.00 | 5.3 | 2.8 | |||
| Compression | 0.16 | 3.6 | 3.4 | |||
| Number of Fiducials | 0.60 | 0.28 | ||||
| <3 | 0.87 | 5.8 | 3.8 | |||
| ≥3 | 0.78 | 4.8 | 2.6 | |||
| Treatment Time | 0.01 | 0.01 | ||||
| < 485 s | 0.57 | 4.7 | 1.9 | |||
| ≥ 485 s | 1.06 | 5.3 | 3.2 | |||
| PTV Volume | 0.65 | 0.26 | ||||
| < 41 cm3 | 0.84 | 5.3 | 2.8 | |||
| ≥ 41 cm3 | 0.80 | 5.1 | 2.9 | |||
| BMI | 0.85 | 0.60 | ||||
| < 23 | 0.83 | 5.2 | 3.3 | |||
| ≥ 23 | 0.82 | 5.3 | 2.3 | |||