Table 4.

Reproducibility of 2D and 3D MRE stiffness values measured with different driver types, keeping breath-hold phase constant

	Conditions		Reproducibility parameter
MRE method	Breath-hold phase (Constant condition)	Driver type (Variable condition)	Bias (kPa)*	Bias p- value	RDC	LOA (kPa)	CCC
2D	Inspiration	Rigid – Flexible	0.07	0.22	0.44	−0.37, 0.50	0.79 (0.50, 0.92)
2D	Expiration	Rigid – Flexible	0.06	0.20	0.37	−0.31, 0.43	0.83 (0.58, 0.94)
3D	Inspiration	Rigid – Flexible	0.03	0.19	0.20	−0.17, 0.23	0.94 (0.82, 0.98)
3D	Expiration	Rigid – Flexible	−0.03	0.20	0.19	−0.22, 0.16	0.86 (0.65, 0.95)

Table summarizes the reproducibility parameters for 2D and 3D MRE measured with different drivers, keeping breath-hold phase constant.

^*The bias is calculated as the mean stiffness value with the rigid driver minus the mean value with the flexible driver. Hence, a positive bias indicates that liver stiffness values measured with the rigid driver were greater than those measured with the flexible driver.

RDC=reproducibility coefficients; LOA=Limit of Agreement; CCC=concordance correlation coefficients.

Values in parentheses are 95% confidence limits.