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Table 4 Comparison of COVs (Coefficients of variation, %) of all spheres among three different correction combinations

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

  Correction combination 37 mm 28 mm 22 mm 17 mm 13 mm 10 mm P value
32:1 AC + SC + RR 93.77 92.21 88.01 87.85 85.95 86.64  
  AC + RR 74.53 72.91 70.50 71.00 69.76 70.82  < 0.001a
  AC + SC 102.96 103.52 101.71 101.53 100.70 100.80  < 0.001b
16:1 AC + SC + RR 95.09 94.61 89.02 89.62 88.86 85.71  
  AC + RR 76.36 75.60 72.28 72.54 70.40 69.06  < 0.001a
  AC + SC 96.95 96.33 97.64 97.13 95.44 94.43 0.007b
8:1 AC + SC + RR 97.25 94.93 91.36 90.93 90.74 87.10  
  AC + RR 77.98 75.92 73.78 72.54 72.06 69.67  < 0.001a
  AC + SC 96.31 93.75 94.79 94.89 95.34 95.60 0.096b
4:1 AC + SC + RR 92.71 88.97 84.03 83.13 82.02 79.55  
  AC + RR 73.12 72.69 69.53 68.38 66.97 64.92  < 0.001a
  AC + SC 91.77 91.38 91.91 91.49 91.80 94.04 0.026b
  1. Reconstruction parameters: 35 iterations, 20 subsets, no filter; Acquisition parameters: 120 s/frame of acquisition time, 15% energy window; AC, attenuation correction; SC, scatter correction; RR, resolution recovery correction; a, AC + SC + RR vs. AC + RR; b, AC + SC + RR vs. AC + SC