Fig. 1

a & b. Pre-treatment DWI for prediction of CRT response. a Pre-treatment ADC map of a squamous cell carcinoma of the tongue (arrows) with a low ADC (0.73 × 10−3 mm2/s) in a tumour with local control; b Pre-treatment ADC map of a squamous cell carcinoma of the tongue (arrows) with a high ADC (1.10 × 10−3 mm2/s) in a tumour with local failure