Table 3. Correlation among the different parameters measured using six thresholding strategies.
| Thresholding strategy 1 | Thresholding strategy 2 | FD number | Area FD | Average size FD | FD density |
|---|---|---|---|---|---|
| G. Otsu | G. Mean | r=0.951; P<0.001* | r=0.892; P<0.001* | r=0.578; P=0.015* | r=0.920; P<0.001* |
| G. Default | r=0.999; P<0.001* | r=0.992; P<0.001* | r=0.969; P<0.001* | r=0.992; P<0.001* | |
| L. Mean | r=0.823; P<0.001* | r=0.741; P<0.001* | r=0.687; P=0.002* | r=0.735; P<0.001* | |
| L. Phansalkar | r=0.956; P<0.001* | r=0.837; P<0.001* | r=0.681; P=0.003* | r=0.859; P<0.001* | |
| L. Niblack | r=0.467; P=0.051 | r=0.686; P=0.002* | r=–0.62; P=0.814 | r=0.826; P<0.001* | |
| G. Mean | G. Otsu | r=0.951; P<0.001* | r=0.892; P<0.001* | r=0.578; P=0.015* | r=0.920; P<0.001* |
| G. Default | r=0.957; P<0.001* | r=0.875; P<0.001* | r=0.547; P=0.023* | r=0.890; P<0.001* | |
| L. Mean | r=0.680; P<0.001* | r=0.556; P=0.017* | r=0.365; P=0.150 | r=0.545; P=0.016* | |
| L. Phansalkar | r=0.935; P<0.001* | r=0.876; P<0.001* | r=0.502; P=0.040* | r=0.771; P<0.001* | |
| L. Niblack | r=0.427; P=0.077 | r=0.695; P=0.001* | r=–0.286; P=0.266 | r=0.814; P<0.001* | |
| G. Default | G. Otsu | r=0.999; P<0.001* | r=0.992; P<0.001* | r=0.969; P<0.001* | r=0.992; P<0.001* |
| G. Mean | r=0.957; P<0.001* | r=0.875; P<0.001* | r=0.547; P=0.023* | r=0.890; P<0.001* | |
| L. Mean | r=0.813; P<0.001* | r=0.782; P<0.001* | r=0.717; P=0.001* | r=0.779; P<0.001* | |
| L. Phansalkar | r=0.958; P<0.001* | r=0.802; P<0.001* | r=0.630; P=0.007* | r=0.851; P<0.001* | |
| L. Niblack | r=0.468; P=0.050 | r=0.671; P=0.002* | r=–0.069; P=0.791 | r=0.795; P<0.001* | |
| L. Mean | G. Otsu | r=0.823; P<0.001* | r=0.741; P<0.001* | r=0.687; P=0.002* | r=0.735; P<0.001* |
| G. Mean | r=0.680; P<0.001* | r=0.556; P=0.017* | r=0.365; P=0.150 | r=0.545; P=0.016* | |
| G. Default | r=0.813; P<0.001* | r=0.782; P<0.001* | r=0.717; P=0.001* | r=0.779; P<0.001* | |
| L. Phansalkar | r=0.789; P<0.001* | r=0.365; P=0.136 | r=0.191; P=0.463 | r=0.841; P=0.037* | |
| L. Niblack | r=0.495; P=0.037* | r=0.409; P=0.092 | r=–0.020; P=0.938 | r=0.453; P=0.051 | |
| L. Phansalkar | G. Otsu | r=0.956; P<0.001* | r=0.837; P<0.001* | r=0.681; P=0.003* | r=0.859; P<0.001* |
| G. Mean | r=0.935; P<0.001* | r=0.876; P<0.001* | r=0.502; P=0.040* | r=0.771; P<0.001* | |
| G. Default | r=0.958; P<0.001* | r=0.802; P<0.001* | r=0.630; P=0.007* | r=0.851; P<0.001* | |
| L. Mean | r=0.789; P<0.001* | r=0.365; P=0.136 | r=0.191; P=0.463 | r=0.481; P=0.037* | |
| L. Niblack | r=0.474; P=0.047* | r=0.628; P=0.005* | r=–0.012; P=0.963 | r=0.863; P<0.001* | |
| L. Niblack | G. Otsu | r=0.467; P=0.051 | r=0.686; P=0.002* | r=–0.062; P=0.814 | r=0.826; P<0.001* |
| G. Mean | r=0.427; P=0.077 | r=0.695; P=0.001* | r=–0.286; P=0.266 | r=0.814; P<0.001* | |
| G. Default | r=0.468; P=0.050 | r=0.671; P=0.002* | r=–0.069; P=0.791 | r=0.795; P<0.001* | |
| L. Mean | r=0.495; P=0.037 | r=0.409; P=0.092 | r=–0.020; P=0.938 | r=0.453; P=0.051 | |
| L. Phansalkar | r=0.474; P=0.047* | r=0.628; P=0.005* | r=–0.012; P=0.963 | r=0.863; P<0.001* |
Values of Pearson correlation coefficient (r) and P value are presented. *, P<0.05. FD, flow deficits; G., global; L., local; N., number.