Fig. 2
Representative DWI quantitative measurements. Lesions as indicated by blue arrows. a shows an example diagram of the ROI sketch. The black line outlines ROI 1, which is the whole solid portion of the slice with maximum transverse diameter for the lesion. The red line outlines ROI 2 of 8-10 mm2, the red dashed line is the interior of the lesion, and the red solid line is the contralateral-normal thyroid tissue. b and c show a patient with thyroid adenoma. b shows a DWI image with DWISD and DWISIR of 22 and 1.07. c shows ADC images with ADCSD, ADCSIR, ADCmin, ADCmean and ADCVSD of 110, 0.97, 1.15, 152 and 171. d and e show a patient with papillary thyroid cancer. d is a DWI image with DWISD and DWSIR of 24.7 and 1.56. e is an ADC image with ADCSD, ADCSIR, ADCmin, ADCmean and ADCVSD of 83, 0.74, 0.65, respectively, 1.04 and 69.59, respectively. Abbreviations: DWI, diffusion weighted imaging; ADC, apparent diffusion coefficient; SI, signal intensity; SD, standard deviation; ADCmin, minimum apparent diffusion coefficient value; ADCmean, mean apparent diffusion coefficient value; ADCVSD, standard deviation of apparent diffusion coefficient value