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Table 3: Comparison of isocentre air kerma measurements for each clinical mode using a 100mm ionisation chamber on both the Clinac iX and TrueBeam linacs.
| Imaging Protocol | Air Kerma (mGy) | Air Kerma Ratio (TrueBeam/Clinac iX) | |
|---|---|---|---|
| Clinac iX | TrueBeam | ||
| Pelvis S | 22 | 10.8 | 49% |
| Pelvis M | 57.9 | 27.5 | 47% |
| Pelvis L | 89.3 | 50.1 | 56% |
| Pelvis XL | 146.6 | 77.5 | 53% |
