Fast self-navigated wall shear stress measurements in the murine aortic arch using radial 4D-phase contrast cardiovascular magnetic resonance at 17.6 T

Table 5 Reproducibility. Three mice were measured twice within 7 days. Longitudinal WSS, circumferential WSS and radial stress as well as OSI values were determined in 3 regions (ascending, bifurcation area, descending) and 4 sections, respectively. Correlation coefficient r² (between measurement 1 and 2), bias (mean of difference between measurement 1 and 2) and scattering (1.96 SD of difference between measurement 1 and 2) were determined for all 4 measured variables. The corresponding plots can be found in Additional file 1: Figure S1–S3

Mouse	1	2	3
Longitudinal WSS
Correlation r²	0.73	0.84	0.82
Bias [N/m²]	0.004	0.27	0.38
1.96· STD [N/m²]	0.807	0.65	0.53
Circumferential WSS
Correlation r²	0.63	0.74	0.66
Bias [N/m²]	0.08	0.02	0.03
1.96· STD [N/m²]	0.43	0.65	0.50
Radial Stress
Correlation r²	0.60	0.29	0.37
Bias [N/m²]	−0.11	0.21	−0.006
1.96· STD [N/m²]	0.82	0.65	1.38
OSI
Correlation r²	0.72	0.22	0.15
Bias	−0.02	−0.04	−0.02
1.96· STD	0.07	0.15	0.10

ISSN: 1532-429X