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

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

Effective Orifice area (cm2) Method Absolute error (cm2) Mean relative error (%)
0.48 CMRCONT 0.10 ± 0.02 23 ± 5
  CMRJSLD 0.02 ± 0.01 4 ± 3
  CMRSPVT 0.02 ± 0.004 5 ± 1
1.00 CMRCONT 0.03 ± 0.01 3 ± 1
  CMRJSLD 0.04 ± 0.04 4 ± 4
  CMRSPVT 0.05 ± 0.02 5 ± 2
1.38 CMRCONT 0.09 ± 0.02 6 ± 2
  CMRJSLD 0.04 ± 0.03 3 ± 2
  CMRSPVT 0.04 ± 0.02 3 ± 1
2.11 CMRCONT 0.06 ± 0.03 3 ± 2
  CMRJSLD 0.03 ± 0.03 1 ± 1
  CMRSPVT 0.08 ± 0.07 4 ± 3
All orifices CMRCONT 0.07 ± 0.04 9 ± 9
  CMRJSLD 0.03 ± 0.03 3 ± 3
  CMRSPVT 0.05 ± 0.04 4 ± 2
  1. The reference value is the EOA predicted using potential flow theory (EOA = Cc × GOA), where GOA is the geometrical orifice area and Cc is the contraction coefficient that is = 0.61 (i.e. value for Cc for harp-edge orifices with small aspect ratio). CMRCONT: EOA determined using continuity equation; CMRJSLD: EOA determined using shear layer detection (JSLD) based on acoustical source term concept; CMRSPVT: EOA determined using single plane velocity truncation (SPVT) method.