Estimation of aortic pulse wave transit time in cardiovascular magnetic resonance using complex wavelet cross-spectrum analysis

Table 4 Effect of CMR scanner and acquisition protocol

archPWV_WU		Avg by 2	Avg by 3	Avg by 4
Linear fit slope	Group 1	1.02	0.94	0.91
Linear fit slope	Group 2	1.05	0.96	0.88
Bland-Altman mean bias [limits] (m/s)	Group 1	0.32 [-1.30 to 1.95]	0.30 [-1.54 to 2.16]	0.37 [-1.68 to 2.42]
Bland-Altman mean bias [limits] (m/s)	Group 2	0.07 [-1.58 to 1.73]	-0.06 [-2.51 to 2.38]	-0.16 [-3.17 to 2.84]
Correlation r(p)	Group 1	0.92 (<0.001)	0.90 (<0.001)	0.87 (<0.001)
Correlation r(p)	Group 2	0.96 (<0.001)	0.90 (<0.001)	0.85 (<0.001)

For the wavelet-based method, aortic pulse wave velocity (archPWV_WU) estimated from the original ascending and descending aortic flow curves, was used as a reference for comparisons against archPWV_WU estimated from curves with lower temporal resolution obtained by averaging time points by blocks of 2 (Avg by 2), 3 (Avg by 3) and 4 (Avg by 4) in both Group 1 and Group 2

ISSN: 1532-429X