Table 2. The correlation between QSM and QCT and the reproducibility of QSM measurement between two scans.

Vertebral	QSM vs. QCT			QSM (Scan 1 vs. Scan 2)
	R	k (95% CI)		R	k (95% CI)
L1	−0.66	−1.69 (−2.19, −1.18)		0.87	0.89 (0.76, 1.01)
L2	−0.70	−1.90 (−2.40, −1.40)		0.91	0.97 (0.85, 1.08)
L3	−0.75	−2.08 (−2.56, −1.61)		0.91	0.96 (0.84, 1.06)
L4	−0.70	−2.32 (−2.93, −1.71)		0.89	0.89 (0.76, 1.01)

QCT, quantitative computed tomography; QSM, quantitative susceptibility mapping; R, correlation coefficient; CI, confidence interval; k, slope.