TABLE 3

Diagnostic Accuracy with ¹⁸F-FDOPA PET Using Various Tumor–to–Normal-Tissue Thresholds in Groups 1 and 2

Tumor–to–normal- tissue threshold	Group 1 (n = 30)	Group 2 (n = 51)	Combining 2 groups (n = 81)
T/S > 0.75
Sensitivity	100	97	98
Specificity	86	86	86
Accuracy	97	94	95
PPV	96	95	95
NPV	100	92	95
T/S > 1.0
Sensitivity	96	86	92
Specificity	100	93	95
Accuracy	97	88	93
PPV	100	94	98
NPV	88	75	80
T/N > 1.3
Sensitivity	96	95	95
Specificity	86	86	86
Accuracy	93	94	93
PPV	96	95	95
NPV	86	92	86
T/W > 1.6
Sensitivity	96	92	93
Specificity	86	86	86
Accuracy	93	84	91
PPV	96	87	95
NPV	86	75	82