Table 3 DNM 530c and DSPECT concordance correlation coefficients for thickening

From: Left ventricular function assessment using ¹²³I/^99mTc dual-isotope acquisition with two semi-conductor cadmium–zinc–telluride (CZT) cameras: a gated cardiac phantom study

Thickening		Pearson’s			Bland Altman
Thickening		r [95 % CI]	CCC [95 % CI]	C.b	Mean diff. [95 % CI]	Regression	R ²
Acquisition	Isotope
Single	¹²³I	0.93 [0.88–0.96]	0.92 [0.86–0.95]	0.99	−3.59 [−26.45;19.28]	y = −0.063x − 0.694	0.026
Single	^99mTc	0.94 [0.90–0.97]	0.93 [0.89–0.96]	0.99	−3.14 [−21.65;15.38]	y = −0.125x + 2.331	0.121
Dual	¹²³I	0.87 [0.79–0.93]	0.84 [0.75–0.9]	0.97	−4.35 [−33.78;25.08]	y = −0.248x + 6.801	0.191
Dual	^99mTc	0.94 [0.90–0.97]	0.94 [0.89–0.96]	1	−2.84 [−22.04;16.35]	y = −0.09x + 1.009	0.067
Camera
DSPECT	¹²³I	0.88 [0.80–0.93]	0.88 [0.81–0.93]	1	1.43 [−23.87;26.74]	y = 0.208x − 7.608	0.177
DSPECT	^99mTc	0.96 [0.93–0.98]	0.96 [0.93–0.98]	1	0.78 [−14.06;15.63]	y = −0.088x + 4.449	0.09
DNM 530c	¹²³I	0.91 [0.85–0.95]	0.91 [0.85–0.95]	1	0.67 [−24.38;25.71]	y = 0.026x − 0.588	0.004
DNM 530c	^99mTc	0.96 [0.94–0.98]	0.96 [0.93–0.98]	1	1.08 [−14.5;16.65]	y = −0.053x + 3.446	0.037

Bland–Altman mean difference (mean diff), regression, and R ²
r, Pearson’s correlation (precision); CCC, Lin’s concordance correlation; C.b, r/CCC = bias factor (trueness)

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