Table 1.

Evaluation of agreement between fluid-structure interaction (FSI) model predicted and 4D flow MRI derived calculations of wall shear stress (WSS). The agreement was evaluated at 3 anatomic locations with 12 sectors at each location. CCC: concordance correlation coefficient, CI: confidence interval, std: standard deviation.

Parameter	Common Carotid Artery		Internal Carotid Artery		External Carotid Artery
	Time-averaged WSS	Peak Systolic WSS	Time-averaged WSS	Peak Systolic WSS	Time-averaged WSS	Peak Systolic WSS
CCC
FSI vs. Velocity-based Method	0.69	0.68	0.77	0.71	0.42	0.31
FSI vs. Flow-based Method	0.49	0.48	0.89	0.84	0.41	0.31
Bias (95% CI), [Pascals]
FSI vs. Velocity-based Method	0.19 (0.94)	0.39 (1.50)	−0.03 (0.35)	−0.20 (0.80)	−1.26 (2.61)	−3.52 (6.51)
FSI vs. Flow-based Method	0.31 (0.93)	0.60 (1.43)	0.03 (0.24)	−0.15 (0.60)	−1.07 (2.78)	−3.16 (6.77)
Absolute Difference (mean +/− std), [Pascals]
FSI vs. Velocity-based Method	0.43 ± 0.25	0.70 ± 0.46	0.11 ± 0.14	0.23 ± 0.39	1.26 ± 1.33	3.52 ± 3.32
FSI vs. Flow-based Method	0.45 ± 0.33	0.80 ± 0.48	0.09 ± 0.08	0.17 ± 0.29	1.20 ± 1.30	3.29 ± 3.32