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Table 4 Inter-observer reproducibility and effect of 20- vs. 50-time reconstructed frames temporal resolution

From: Comparison of different methods for the estimation of aortic pulse wave velocity from 4D flow cardiovascular magnetic resonance

 Inter-observer reproducibilityEffect of temporal resolution
Mean bias (m/s)LA (m/s)pICCMean bias (m/s)LA (m/s)pICC
S1TTc−0.50[−2.6;1.6]0.590.95−1.62[−11;8.1]0.490.47
TTw0.46[−5.2;6.1]1.000.860.29[−1;1.5]0.500.91
TTf−0.46[−3.4;2.4]0.430.910.35[−0.5;1.2]0.500.93
S2TTc0.06[−0.6;0.7]0.840.99−0.96[−5.5;3.6]0.540.75
TTw0.09[−0.7;0.8]0.800.990.15[−0.5;0.8]0.760.97
TTf−0.53[−4.2;3.2]0.380.610.15[−0.6;0.9]0.920.97
S30.18[−0.9;1.2]0.840.970.33[−1.4;2]0.680.82
  1. Measures of repeatability of 4D flow MRI aoPWV estimates are provided: Bland-Altman mean biases and limits of agreement (LA) as well as intra class correlation coefficients (ICC). p values correspond to Wilcoxon rank-sum test of comparisons between aoPWV values obtained by the two observers and for the two reconstructions. S1, S2 and S3: Strategies 1, 2 and 3. TTc, TTw and TTf: transit times estimated using cross-correlation, wavelets and Fourier transforms, respectively