Table 3.
30 Gy uptake ratios, 47.5 Gy uptake ratios, and the percent changes in the 30 Gy and 47.5 Gy uptake ratios in patients with left breast cancer.
| Variables | PET1 (n = 55) |
PET2 (n = 29) |
PET3 (n = 55) |
PET4 (n = 37) |
|---|---|---|---|---|
| 30 Gy uptake ratio | 0.85 ± 0.12 | 0.84 ± 0.10 | 1.09 ± 0.22 | 1.01 ± 0.18 |
| Percent change in the 30 Gy uptake ratio (%) | - | 1.7 ± 11.5 | 28.7 ± 22.3 | 18.2 ± 23.3 |
| 47.5 Gy uptake ratio | 0.81 ± 0.20 * | 0.83 ± 0.17 † | 1.19 ± 0.28 * | 1.10 ± 0.28 ‡ |
| Percent change in the 47.5 Gy uptake ratio (%) | - | 7.0 ± 28.7 † | 50.2 ± 36.9 * | 40.6 ± 51.8 ‡ |
All data were expressed as average ± standard deviation. * Measured in 47 patients; † Measured in 24 patients; ‡ Measured in 30 patients. 30 Gy uptake ratio, 30 Gy-irradiated myocardium-to-low-irradiated myocardium uptake ratio; 47.5 Gy uptake ratio, 47.5 Gy-irradiated myocardium-to-low-irradiated myocardium uptake ratio; PET1, staging positron emission tomography/computed tomography (PET/CT); PET2, post-chemotherapy PET/CT; PET3, post-radiotherapy PET/CT; PET4, surveillance PET/CT after adjuvant treatment.