Improved Performance of Compartments in Detecting the Activity of Axial Spondyloarthritis Based on IVIM DWI with Optimized Threshold Value
Table 5
ROC curve analysis for ,, and in the active, inactive, and control groups.
Parameter
Active group-inactive group AUC [cutoff value] (sensitivity, specificity, accuracy)
Active group-control group AUC [cutoff value] (sensitivity, specificity, accuracy)
Inactive group-control group AUC [cutoff value] (sensitivity, specificity, accuracy)
s/mm2
(10-3 mm2/s)
0.877 [0.654]
0.981 [0.501]
0.778 [0.307]
(0.825, 0.840, 0.837)
(0.875, >0.999, 0.900)
(0.701, 0.750, 0.707)
(%)
0.499 [-] (-)
0.551 [8.510] (0.875, 0.350, 0.700)
0.548 [8.614] (0.840, 0.350, 0.780)
(10-3 mm2/s)
0.283 [-] (-)
0.145 [-] (-)
0.283 [-] (-)
s/mm2
(10-3 mm2/s)
0.882 [0.578]
0.981 [0.538]
0.776 [0.298]
(0.900, 0.806, 0.821)
(0.900, >0.999, 0.933)
(0.757, 0.700, 0.756)
(%)
0.595 [25.343]
0.632 [25.164]
0.565 [13.669]
(0.475, 0.757, 0.696)
(0.475, 0.850, 0.600)
(0.833, 0.350, 0.774)
(10-3 mm2/s)
0.306 [-] (-)
0.214 [-] (-)
0.352 [-] (-)
Threshold s/mm2
(10-3 mm2/s)
0.881 [0.605]
0.980 [0.519]
0.794 [0.304]
(0.875, 0.833, 0.842)
(0.900, >0.999, 0.933)
(0.722, 0.750, 0.720)
(%)
0.613 [13.743]
0.738 [14.486]
0.644 [14.474]
(0.875, 0.410, 0.512)
(0.800, 0.750, 0.783)
(0.576, 0.750, 0.598)
(10-3 mm2/s)
0.316 [-] (-)
0.205 [-] (-)
0.346 [-] (-)
Data are areas under the curve. Numbers in parentheses are cutoff values. AUC: area under the curve; ROC: receiver operating characteristic; : pure diffusion coefficient; : perfusion fraction; : pseudoperfusion coefficient.
