EJNMMI Physics

Table 2 DNM 530c and DSPECT concordance correlation coefficients for motion

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

Motion		Pearson’s			Bland Altman
Motion		r [95 % CI]	CCC [95 % CI]	C.b	Mean diff. [95 % CI]	Regression	R ²
Acquisition	Isotope
Single	¹²³I	0.94 [0.89–0.96]	0.93 [0.89–0.96]	0.99	0.06 [−2.15;2.28]	y = 0.123x − 0.764	0.107
Single	^99mTc	0.95 [0.92–0.97]	0.94 [0.91–0.97]	0.99	0.23 [−1.48;1.94]	y = 0.088x − 0.354	0.071
Dual	¹²³I	0.90 [0.83–0.94]	0.88 [0.81–0.93]	0.98	−0.15 [−2.8;2.5]	y = −0.188x + 1.13	0.144
Dual	^99mTc	0.94 [0.90–0.97]	0.94 [0.9–0.97]	1	0.03 [−1.81;1.87]	y = −0.007x + 0.076	0
Camera
DSPECT	¹²³I	0.91 [0.86–0.95]	0.89 [0.83–0.93]	0.98	0.08 [−2.57;2.72]	y = 0.248x − 1.599	0.271
DSPECT	^99mTc	0.97 [0.95–0.98]	0.97 [0.95–0.98]	1	0.22 [−1.74; 2.18]	y = −0.003x + 0.239	0
DNM 530c	¹²³I	0.94 [0.90–0.97]	0.94 [0.9–0.97]	1	−0.14 [−2.11;1.84]	y = −0.061x + 0.276	0.031
DNM 530c	^99mTc	0.97 [0.96–0.99]	0.97 [0.95–0.98]	1	−0.01 [−1.29;1.26]	y = −0.089x + 0.576	0.135

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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