Fig. 3
M50, differentiated type of non-keratinizing nasopharyngeal carcinoma. a T2WI/IDEAL showing a mass (arrow) invasion in the right pharyngeal recess and posterior nasopharyngeal wall. b BF map showing relatively higher perfusion of tumor compared to surrounding tissues. c Merged image (image a and b) showing ROI of the tumor on ASL and acquired BF of the tumor as 183.88 mL/min/100 g. IVIM image with b value = 1000 s/mm2 (d) showed diffusion restriction in the tumorous area. ADC (0.874 × 10− 3 mm2/s), D (0.527 × 10− 3 mm2/s), D* (15.6 × 10− 3 mm2/s) and f (0.28) (e-h) were obtained