Fig. 1.
Treatment response group.
Gd-T1WI and DWI in a 52-year-old man with brain metastasis from lung adenocarcinoma. The contrast-enhanced T1WI showed a well-enhanced lesion in the right parietal lobe before radiotherapy. The maximum tumor volume (3.1 cm3 at baseline) markedly decreased at one month after radiotherapy (2.5 cm3) and six months (1.4 cm3) after radiotherapy. The ADC values in tumor parenchyma steadily increased from 0.75 × 10−3mm2/s at baseline, 0.74 × 10−3 mm2/s at one month after radiotherapy, and 0.81 × 10−3 mm2/s at six months after radiotherapy.