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. 2013 Apr 2;26(5):958–970. doi: 10.1007/s10278-013-9594-7

Table 2.

Selected feature extraction method

Objective features Selected the feature extraction method Correlation coefficient
Depth–width ratio Ratio of the maximum chords in the vertical and horizontal directions 0.86
Degree of indistinctness in margin Highest mean pixel value of gradient (Sobel) on four divided outlines of the mass 0.70
Homogeneity in internal echoes Angular second moment 0.70
Echo level in internal echoes Inline graphic 0.76
Echo level in posterior echoes Inline graphic 0.88
Degree of round Output value of the ANN by use of (F1), (F5), (F6), (F8), (F9), (F11), (F12), (F13), and (F15) 0.72
Degree of polygonal Output value of the ANN by use of (F1), (F3), (F4), (F6), (F7), (F8), (F9), (F11), (F12), (F13), (F14), and (F15) 0.88
Degree of lobulated Output value of the ANN by use of (F3), (F4), (F5), (F6), (F7), (F8), (F11), (F13), (F14), and (F15) 0.74
Degree of irregular Output value of the ANN by use of (F1), (F3), (F5), (F7), (F8), (F9), (F10), (F11), (F13), (F14), and (F15) 0.73