Table 3.
Apparent diffusion coefficient (ADC) values of tumours and benign tissues before and after intensity-modulated radiotherapy (IMRT) (×10−3 mm2 s−1)
| Time of ADC measurement | ADC value × 10-3 mm2 s−1, mean ± standard deviation (range) |
|
|---|---|---|
| Tumours (n = 78) | Benign tissues (n = 31) | |
| Pre-IMRT overall | 1.04 ± 0.18 (0.69–1.49) | 1.59 ± 0.17 (1.34–2.01) |
| Non-recurrence group (n = 65) | 1.05 ± 0.18 (0.69–1.49) | |
| Recurrence group (n = 13) | 1.00 ± 0.17 (0.74–1.27) | |
| Post-IMRT overall | 1.45 ± 0.15 (1.06–1.78) | 1.51 ± 0.13 (1.25–1.78) |
| Non-recurrence group | 1.49 ± 0.12 (1.14–1.78) | |
| Recurrence group | 1.27 ± 0.14 (1.06–1.53) | |
Comparison of the mean ADC values of tumours: the mean post-IMRT ADC value of the recurrence group was significantly lower than that of the non-recurrence group; p < 0.001. After IMRT there was no significant difference in ADC values between the benign tissues and tumours of non-recurrence group; p = 0.47.