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. 2018 Jun 18;17:82. doi: 10.1186/s12938-018-0507-3

Fig. 3.

Fig. 3

Feature of margin for thyroid nodules. The characteristics of the thyroid margin, a is the original image of thyroid nodule, b is the boundary of the nodule, and c, d are the internal and external bands of the boundary after morphological operation, respectively