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Table 1 Correlation and linear regression analysis of RCs among different acquisition and reconstruction parameters

From: Impacts of acquisition and reconstruction parameters on the absolute technetium quantification of the cadmium–zinc–telluride-based SPECT/CT system: a phantom study

    37 mm 28 mm 22 mm 17 mm 13 mm 10 mm
32:1 Iterations (1–35) Regression coefficient 0.63 0.93 0.93 1.21 1.60 1.47
   r 0.58 0.62* 0.70* 0.80* 0.90** 0.92**
  Iterations (35–90) Regression coefficient 0.02 0.03 0.03 0.04 0.11 0.15
   r 0.98** 0.99** 0.99** 0.97** 0.97** 0.99**
  Subsets Regression coefficient 0.09 0.15 0.20 0.39 0.69 0.70
   r 0.68 0.80* 0.87* 0.89* 0.84* 0.85*
  FWHM Regression coefficient  − 11.36  − 11.83  − 9.96  − 10.28  − 10.88  − 9.49
   r  − 1.00**  − 0.99**  − 0.98**  − 0.96**  − 0.92*  − 0.87*
  Acquisition time (s/frame) Regression coefficient  − 0.01 0.04 0.07 0.05 0.05 0.05
   r  − 0.62 0.84* 0.72* 0.66 0.36 0.36
16:1 Iterations (1–35) Regression coefficient 0.70 1.04 1.03 1.37 1.28 1.59
   r 0.59 0.66* 0.74* 0.84* 0.92** 0.95**
  Iterations (35–90) Regression coefficient 0.02 0.03 0.03 0.04 0.11 0.15
   r 0.98** 0.98** 0.98** 0.98** 0.98** 0.98**
  Subsets Regression coefficient 0.07 0.12 0.13 0.35 0.69 1.14
   r 0.61 0.64 0.70 0.76* 0.86* 0.90*
  FWHM Regression coefficient  − 11.02  − 11.83  − 9.85  − 10.65  − 8.68  − 10.09
   r  − 1.00**  − 0.99**  − 0.99**  − 0.96**  − 0.92*  − 0.86*
  Acquisition time (s/frame) Regression coefficient  − 0.04  − 0.03  − 0.02  − 0.04 0.02 0.28
   r  − 0.63  − 0.55  − 0.73*  − 0.68 0.29 0.82*
8:1 Iterations (1–35) Regression coefficient 0.80 1.15 1.15 1.23 1.29 0.98
   r 0.63* 0.72* 0.82* 0.88** 0.95** 0.94**
  Iterations (35–90) Regression coefficient 0.02 0.04 0.03 0.06 0.17 0.06
   r 0.98** 0.99** 0.98** 0.98** 0.98** 0.94**
  Subsets Regression coefficient 0.08 0.10 0.26 0.47 0.90 0.40
   r 0.65 0.52 0.83* 0.85* 0.83* 0.66
  FWHM Regression coefficient  − 9.95  − 10.90  − 8.73  − 8.79  − 9.22  − 6.23
   r  − 1.00**  − 0.99**  − 0.98**  − 0.96**  − 0.92*  − 0.90*
  Acquisition time (s/frame) Regression coefficient 0.09 0.04  − 0.02 0.01 0.12  − 0.31
   r 0.70 0.62  − 0.44 0.02 0.43  − 0.71*
4:1 Iterations (1–35) Regression coefficient 0.87 1.26 1.10 1.09 0.51 0.81
   r 0.69* 0.81* 0.85** 0.92** 0.96** 0.95**
  Iterations (35–90) Regression coefficient 0.02 0.05 0.03 0.07 0.12 0.19
   r 0.98** 0.98** 0.97** 0.96** 0.99** 0.99**
  Subsets Regression coefficient  − 0.06 0.11 0.16 0.50 0.56 1.14
   r  − 0.34 0.44 0.57 0.76* 0.87* 0.98**
  FWHM Regression coefficient  − 8.59  − 9.39  − 7.24  − 7.51  − 4.23  − 6.10
   r  − 1.00**  − 0.99**  − 0.99**  − 0.96**  − 0.90*  − 0.89*
  Acquisition time (s/frame) Regression coefficient 0.16 0.21  − 0.08 0.24 0.26  − 0.34
   r 0.71* 0.76*  − 0.68 0.82* 0.70  − 0.53
  1. **, P-value < 0.001; *, P-value < 0.05; r, Pearson r