Table 3.
Patient-Specific Results of AMI and PMI Motion Management Strategies With Manual or Automatic Correction for 5-Field IMRT Simulation.a
| IMRT | Percentage of Over-3 mm Time (%) | Mean RMS Error (mm) | Numberb of kV-on per Track | Numberb of Intervention per Track | |||
|---|---|---|---|---|---|---|---|
| Mean | Max | Mean | Max | Mean | Max | ||
| PMI1c + manual | 3.9 ± 4.1 | 12.6 | 1.2 ± 0.2 | 2 | 2 | 0.08 ± 0.13 | 0.35 |
| PMI1 + auto | 2.7 ± 3.9 | 10.9 | 1.0 ± 0.2 | 2 | 2 | 0.06 ± 0.08 | 0.23 |
| PMI2d + manual | 3.8 ± 2.4 | 8.9 | 1.5 ± 0.3 | 4 | 4 | 0.09 ± 0.16 | 0.43 |
| PMI2 + auto | 1.8 ± 2.2 | 6.4 | 1.2 ± 0.4 | 4 | 4 | 0.08 ± 0.15 | 0.39 |
| AMI + auto | 0.6 ± 1.0 | 2.7 | 0.3 ± 0.1 | 0.9 ± 0.9 | 2.7 | 0.7 ± 0.8 | 2.3 |
Abbreviations: AMI, adaptive monitoring and intervention; IMRT, intensity-modulated radiation therapy; PMI, periodic monitoring and intervention; RMS, root mean square.
aThe delays for manual and auto corrections are assumed to be 30 and 1 second, respectively.
bSetup imaging and correction were not counted in the last 2 columns.
cPMI1: imaging before the first, third, and fifth field, corresponding to 1 imaging per 110 (80) seconds with manual (auto) correction.
dPMI2: imaging before each field, corresponding to 1 imaging per 70 (40) seconds with manual (auto) correction.