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Table 2 Results of Phase contrast-based flow measurement

From: Effects of heart valve prostheses on phase contrast flow measurements in Cardiovascular Magnetic Resonance – a phantom study

  Synthetic aortic valve Prosthesis I Prosthesis II Prosthesis III
a. Peaks of flow deviation (mean min/max) [ml/s] 5.28 (−4.92 to 15.48) at S2 to −41.03 (−51.23 to −30.83) at S7 55.47 (49.54 to 61.39) at S4 to −32.41 (−38.34 to −26.49) at S8 132.20 (126.13 to 138.27) at S2 to - 22.20 (− 28.27 to −16.13) at S5 119.13 (112.14 to 126.12) at S3 to - 21.15 (− 28.14 to - 14.16) at S6
b. Absolute flow variation [ml/s] 46 88 154 140
Percentage according to baseline [%] 15 29 53 35
c. Significance within 15% range of equivalence [ml/s] all positions, except S7 +/−47.08 all positions, except S3 & S4 +/−44.91 all positions, except S2 & S3 +/−43.94 all positions, except S3 +/−32.20
Significance within 20% range of equivalence [ml/s] all positions
+/−62.77
all positions, except S4
+/−59.87
all positions, except S2 & S3
+/−58.59
all positions, except S3
+/−42.94
d. Convergence to reference flow [mm]   19.8 (S5) 13.2 (S4) 13.2 (S4)
  1. a. Min. & max. deviation of flow values from reference flow (S1) & their local attribution (peak to peak), 95% confidence interval bracketed
  2. b. Absolute flow variation between the two peaks. Percentage of flow variation according to the absolute flow values at S1
  3. c. Significances for all measured slices within two ranges of equivalence (15% and 20%)
  4. d. Convergence of flow values: mean flow deviation of less than 15% to reference flow, nearly identical flow values beyond that distance
  5. S1-12 = slice 1 to 12, positions of image acquisition in flow phantom