Measurements of ADC values
ADC measurements of the lesions were performed on the ADC map that contained the largest lesion cross-section, using circular regions-of-interest (ROIs) with a mean area of 10 mm2. Each ROI was carefully drawn within the solid part of the lesion to exclude artifacts and areas of cyst and/or necrosis. The ADC values of each patient’s cervical lymph nodes and thyroid glands were also measured.