Table 2 Patient and PET parameters for the normal thyroid (n = 30) and hypothyroid (n = 22) groups
Characteristic | Normal | Hypothyroid | p value |
|---|---|---|---|
Patient factor | |||
Age (years) | 53.6 (9.6) | 50.0 (10.1) | 0.209 |
Male sex, n (%) | 23 (76.7%) | 16 (72.7%) | 1.000 |
Pretreatment thyroid volume (cm3) | 17.9 (6.6) | 12.1 (4.7) | 0.001 * |
Mean radiotherapy dose to thyroid (Gy) | 40.9 (10.6) | 48.6 (8.4) | 0.007 * |
Mean radiotherapy dose to pituitary (Gy) | 42.8 (24.6) | 43.4 (27.6) | 0.937 |
Early post-treatment PET parameter | |||
Thyroid SUVmax | 2.57 (1.41) | 2.35 (0.69) | 0.511 |
Thyroid SUVmean | 1.89 (0.87) | 1.80 (0.45 | 0.680 |
Thyroid TLG | 14.10 (8.27) | 11.04 (7.09) | 0.167 |
Thyroid functioning volume, cm3 | 16.30 (6.03) | 10.61 (3.81) | < 0.001 * |
Blood pool SUVmax | 2.10 (0.41) | 2.06 (0.36) | 0.688 |
Thyroid SUVmax/blood pool SUV ratio | 1.15 (0.20) | 1.17 (0.32) | 0.752 |
Pituitary SUVmax | 2.76 (0.54) | 2.81 (0.46) | 0.712 |
Pituitary SUVmean | 2.38 (0.48) | 2.36 (0.34) | 0.861 |