Research Article
Development of a Modelling to Correlate Site and Diameter of Brain Metastases with Hippocampal Sparing Using Volumetric Modulated Arc Therapy
Table 1
Parameters of 15 RA plans.
| Plan | Diameter (cm) | Mean Hippocampal Dose (Gy) | Mean Hippocampal dose (Gy2) | HI-PTV whole brain | TC-PTV metastases | TC-PTV whole brain |
| DS 1 | 1 |
12.55 | 8.90 | 0.34 | 0.52 | 0.82 | F 1 | 1 | 13.95 | 10.22 | 0.36 | 0.51 | 0.92 | O 1 | 1 | 12.82 | 9.15 | 0.64 | 0.54 | 0.99 | P 1 | 1 | 13.25 | 9.55 | 0.47 | 0.54 | 0.91 | T 1 | 1 | 36.10 | 33.9 | 0.55 | 0.53 | 0.96 | DS 2 | 2 | 13.46 | 9.75 | 0.78 | 0.55 | 0.92 | F 2 | 2 | 13.49 | 9.78 | 0.78 | 0.72 | 0.90 | O 2 | 2 | 13.68 | 9.96 | 0.53 | 0.52 | 0.92 | P 2 | 2 | 14.87 | 11.12 | 0.57 | 0.54 | 0.93 | T 2 | 2 | 42.00 | 40.27 | 0.68 | 0.48 | 0.90 | DS 3 | 3 | 17.80 | 14.18 | 0.77 | 0.49 | 0.93 | F 3 | 3 | 15.45 | 11.70 | 0.90 | 0.42 | 0.91 | O 3 | 3 | 13.66 | 9.94 | 0.60 | 0.51 | 0.93 | P 3 | 3 | 14.76 | 11.01 | 0.84 | 0.46 | 0.93 | T 3 | 3 | 50.4 | 47.16 | 0.85 | 0.52 | 0.80 |
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DS: deep structure; F: frontal lobe; O: occipital lobe; P: parietal lobe; T: temporal lobe; 1–3: metastases diameter (cm).
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