Table 3.
Mean OAR doses and percentage differences between the VMAT and IMPT plans.
| Average OAR doses (cGy) for n = 5 patients | ||||
|---|---|---|---|---|
| OAR | VMAT-TMI | IMPT | %diff | p-Value |
| Brain | 612.8 | 609.0 | 0.6 | 0.96 |
| Bladder | 772.6 | 383.0 | 50.4 | <0.01 |
| Esophagus | 401.0 | 575.0 | −43.4 | <0.01 |
| Eyes | 293.6 | 287.8 | 2.0 | 0.81 |
| Heart | 483.8 | 418.2 | 13.6 | 0.37 |
| Intestine | 809.0 | 401.0 | 50.4 | <0.01 |
| Kidneys | 709.4 | 542.8 | 23.5 | 0.01 |
| Lungs | 732.6 | 632.8 | 13.6 | 0.02 |
| Parotids | 468.4 | 437.0 | 6.7 | 0.57 |
| Stomach | 491.8 | 460.8 | 6.3 | 0.72 |
| Thyroid | 415.8 | 556.2 | −33.8 | <0.01 |
| Liver | 630.4 | 634.8 | −0.7 | 0.92 |
OAR, organ at risk; VMAT, volumetric modulated arc therapy; TMI, total marrow irradiation; IMPT, intensity-modulated spot-scanning proton therapy.