Quantification of transmural perfusion gradients by high-resolution MR versus fractional flow reserve for the assessment of coronary artery stenosis

Table 1 Diagnostic accuracy of gradientogram analysis (AUC on ROC analysis) by simple thresholding and by adding to the analysis several quantitative parameters related to the transmural perfusion gradients

	Gradient threshold 5%	Gradient threshold 10%	Gradient threshold 15%	Gradient threshold 20%
Gradient yes/no (without considering any quantitative measurements)	0.72	0.78	0.83	0.78
Average gradient extent	0.66	0.84	0.78	0.71
Average gradient peak	0.74	0.83	0.71	0.74
Average gradient area	0.68	0.85	0.79	0.88
Average gradient amplitude	0.65	0.84	0.85	0.76
Average gradient persistence	0.76	0.72	0.72	0.91
Average gradient strength	0.73	0.84	0.83	0.85

ISSN: 1532-429X