Cardiovascular magnetic resonance evaluation of aortic stenosis severity using single plane measurement of effective orifice area

Table 1 Absolute and mean relative error for the determination of the EOA in the in vitro study

Effective Orifice area (cm²)	Method	Absolute error (cm²)	Mean relative error (%)
0.48	CMR_CONT	0.10 ± 0.02	23 ± 5
	CMR_JSLD	0.02 ± 0.01	4 ± 3
	CMR_SPVT	0.02 ± 0.004	5 ± 1
1.00	CMR_CONT	0.03 ± 0.01	3 ± 1
	CMR_JSLD	0.04 ± 0.04	4 ± 4
	CMR_SPVT	0.05 ± 0.02	5 ± 2
1.38	CMR_CONT	0.09 ± 0.02	6 ± 2
	CMR_JSLD	0.04 ± 0.03	3 ± 2
	CMR_SPVT	0.04 ± 0.02	3 ± 1
2.11	CMR_CONT	0.06 ± 0.03	3 ± 2
	CMR_JSLD	0.03 ± 0.03	1 ± 1
	CMR_SPVT	0.08 ± 0.07	4 ± 3
All orifices	CMR_CONT	0.07 ± 0.04	9 ± 9
	CMR_JSLD	0.03 ± 0.03	3 ± 3
	CMR_SPVT	0.05 ± 0.04	4 ± 2

The reference value is the EOA predicted using potential flow theory (EOA = C_c × GOA), where GOA is the geometrical orifice area and C_c is the contraction coefficient that is = 0.61 (i.e. value for C_c for harp-edge orifices with small aspect ratio). CMR_CONT: EOA determined using continuity equation; CMR_JSLD: EOA determined using shear layer detection (JSLD) based on acoustical source term concept; CMR_SPVT: EOA determined using single plane velocity truncation (SPVT) method.

ISSN: 1532-429X