Figure 4
From: Computer-aided assessment of regional vascularity of thyroid nodules for prediction of malignancy
Schematic diagrams show the segmentation of peripheral and central regions of thyroid nodule. After the primary ROI was segmented by the algorithm, the maximum diameter of the ROI was identified (a). With the predefined offset level (n%) given to the algorithm, the secondary ROI was obtained (b). The secondary ROI represents the inner segment (i.e. central region) of the nodule (c). The outer segment (i.e. peripheral region) of the nodule was obtained by subtracting the primary ROI by the secondary ROI (d).
