Table 1 Absolute and Relative gamma evaluation comparison between films irradiated on the MRIdian in an MR environment compared to those irradiated on the Varian Edge linac in a non- MR environment for three open field sizes
From: Clinical utility of Gafchromic film in an MRI-guided linear accelerator
3%/3 mm | 3%/1 mm | 2%/2 mm | ||||
|---|---|---|---|---|---|---|
Open fields (cm2) | MRIdian | Edge | MRIdian | Edge | MRIdian | Edge |
Absolute gamma results | ||||||
1.66 × 1.66 | 99.8 | 98.0 | 98.4 | 94.3 | 98.2 | 93.3 |
4.98 × 4.98 | 100 | 100 | 95.1 | 97.3 | 99.1 | 97.9 |
9.96 × 9.96 | 100 | 99.9 | 98.6 | 100 | 99.8 | 98.9 |
Average | 99.9 | 99.3 | 97.4 | 97.2 | 99.0 | 96.7 |
Standard deviation | 0.1 | 1.1 | 2.0 | 2.9 | 0.8 | 3.0 |
Relative gamma results | ||||||
1.66 × 1.66 | 100 | 98.1 | 97.1 | 93.3 | 95.9 | 92.6 |
4.98 × 4.98 | 99.9 | 99.6 | 92.6 | 97.5 | 97.9 | 98.0 |
9.96 × 9.96 | 100 | 99.9 | 98.2 | 98.8 | 99.8 | 98.9 |
Average | 100.0 | 99.2 | 96.0 | 96.5 | 97.9 | 96.5 |
Standard deviation | 0.1 | 1.0 | 3.0 | 2.9 | 2.0 | 3.4 |