Table 4.

Aortic regurgitation quantification: selected validation studies.22-24

First Author (Year)	CMR Method	n	Reference Standard: Method	r	CMR Reproducibility
Globits (1990)	Spin Echo Cines. LV and RV volumes derived regurgitant	20	Cath determination of RF	0.91	Interobserver mean variation RVSV -7ml And LVSV -7.3
Sondergaard (1993)	Velocity mapping (VENC) regurgitant volume	9	Angiographic grade by aortogram	0.82	n/a
Ley (2007)	VENC derived regurgitant fraction	30	TTE pulse wave Doppler AR quantification	0.68	n/a

RF: regurgitant fraction; VENC: velocity encoding; TTE: transthoracic echocardiography; AR: aortic regurgitation; n/a: not available.