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Dose volume parameters for PTV, GTV, Spinal Cord and Cauda Equina for MRIdian Linac IMRT plans Vs TrueBeamTM STx VMAT plans
| Structures | TrueBeamTM STx VMAT | MRIdian Linac IMRT | p-value |
|---|---|---|---|
| PTV | Median(range) | Median(range) | |
| D98% (Gy) | 25.7 (15.6–29.5) | 26.5 (17.7–29.7) | 0.20 |
| D50% (Gy) | 29.0 (27.9–39.1) | 30.0 (26.4–33.2) | 0.77 |
| Conformity Index | 0.97 (0.93–1.0) | 0.97 (0.90–1.0) | 0.13 |
| Dose Homogeneity Index | 0.22 (0.05–0.6) | 0.19 (0.1–0.57) | 0.49 |
| R50 | 6.1 (2.9–16.7) | 5.2 (2.8–11.9) | 0.05 |
| GTV | |||
| D50% (Gy) | 31.6 (30.4–34.2) | 31.7 (31.0–34.6) | 0.36 |
| D98% (Gy) | 30.12 (25–33.63) | 30.35 (29.17–32.89) | 0.23 |
| Conformity Index | 0.99 (0.95–1.0) | 0.99 (0.96–1.0) | 0.58 |
| Dose Homogeneity Index | 0.09 (0.04–0.33) | 0.08 (0.01–0.18) | 0.30 |
| R50 | 32 (6.08–69.0) | 29 (5.8–66.0) | 0.01 |
| Spinal Cord | |||
| Max dose (Gy) | 12.6 (9.1–15.6) | 13.3 (10.35–17.3) | 0.13 |
| D0.03 (Gy) | 12 (9.0–15.3) | 12.8 (9.5–16.5) | 0.25 |
| Cauda Equina | |||
| Max dose (Gy) | 16 (0.22–28.0) | 18 (0.3–32) | 0.38 |
| D0.03 (Gy) | 13 (0.2–20.0) | 16 (0.25–31) | 0.07 |
Detailed Dose volume histogram parameters for PTV, GTV, Spinal Cord and Cauda Equina for MRIdian Linac IMRT plans Vs TrueBeamTM STx VMAT plans
| PTV | GTV | Spinal Cord | Cauda Equina | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Case # | Volume | Maximum | Dose (Gy) | D95 ( | Gy) | Volume | Maximum | Dose (Gy) | D95 ( | Gy) | Maximum | Dose (Gy) | D0.03 cc | (Gy) | Maximum | Dose (Gy) | D0.03 | cc (Gy) |
| (cc) | MRIdian Linac IMRT | True Beam VMAT | MRIdian Linac IMRT | True Beam VMAT | (cc) | MRIdian Linac IMRT | True Beam VMAT | MRIdian Linac IMRT | True Beam VMAT | MRIdian Linac IMRT | True Beam VMAT | MRIdian Linac IMRT | True Beam VMAT | MRIdian Linac IMRT | True Beam VMAT | MRIdian Linac IMRT | True Beam VMAT | |
| 1 | 60.37 | 34.69 | 35.44 | 27.43 | 27.50 | 7.02 | 34.69 | 35.44 | 32.46 | 33.76 | 14.82 | 14.77 | 14.67 | 14.47 | 19.70 | 21.72 | 19.67 | 20.19 |
| 2 | 50.63 | 32.45 | 32.27 | 27.00 | 27.31 | 6.82 | 32.94 | 32.41 | 30.11 | 30.05 | 13.33 | 13.45 | 13.02 | 13.10 | 20.00 | 21.15 | 19.92 | 18.95 |
| 3 | 66.3 | 36.41 | 37.00 | 27.75 | 27.12 | 27.67 | 36.41 | 37.00 | 32.58 | 29.61 | 17.01 | 11.69 | 16.56 | 10.90 | 21.07 | 14.12 | 20.23 | 13.58 |
| 4 | 47.63 | 31.68 | 30.85 | 27.19 | 27.94 | 18.8 | 34.02 | 33.45 | 30.06 | 30.52 | 13.25 | 15.65 | 12.62 | 15.34 | 24.08 | 21.19 | 22.48 | 19.79 |
| 5 | 2.6 | 33.87 | 30.71 | 27.73 | 27.26 | 0.9 | 33.87 | 32.02 | 30.24 | 30.21 | 12.58 | 13.81 | 11.92 | 12.90 | 9.31 | 12.37 | 7.73 | 7.56 |
| 6 | 3.93 | 33.52 | 31.40 | 27.67 | 27.89 | 1.65 | 33.52 | 34.96 | 32.17 | 27.39 | 10.35 | 9.10 | 10.32 | 9.09 | 16.44 | 18.01 | 12.58 | 12.32 |
| 7 | 3.05 | 32.64 | 30.88 | 27.50 | 27.82 | 1.07 | 32.65 | 33.70 | 30.44 | 29.02 | 11.17 | 10.10 | 11.15 | 10.09 | 32.13 | 28.01 | 31.16 | 19.32 |
| 8 | 25.43 | 32.73 | 34.07 | 27.92 | 27.99 | 2.31 | 32.73 | 34.07 | 30.31 | 31.43 | 13.72 | 10.98 | 13.22 | 10.36 | 13.72 | 10.6 | 13.19 | 10.25 |
| 9 | 29.02 | 33.95 | 34.14 | 27.50 | 27.60 | 1.89 | 35.70 | 34.14 | 30.05 | 30.52 | 11.04 | 9.25 | 9.53 | 8.96 | 0.32 | 0.22 | 0.25 | 0.21 |
| 10 | 38.29 | 33.02 | 33.95 | 27.88 | 27.02 | 2.51 | 33.02 | 33.95 | 30.45 | 30.51 | 17.30 | 14.11 | 14.51 | 13.75 | 3.54 | 3.67 | 3.20 | 3.40 |