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Figure 3: Measurement of the ultrasound grayscale ratio value for papillary thyroid microcarcinoma with homogenous echo. (a) The grayscale value of papillary thyroid microcarcinoma was 38.48. (b) The grayscale value of normal thyroid tissue in the same transverse level was 86.12, and the ultrasound grayscale ratio was 0.45

Figure 3: Measurement of the ultrasound grayscale ratio value for papillary thyroid microcarcinoma with homogenous echo. (a) The grayscale value of papillary thyroid microcarcinoma was 38.48. (b) The grayscale value of normal thyroid tissue in the same transverse level was 86.12, and the ultrasound grayscale ratio was 0.45