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EJNMMI Physics

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