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Table 3 Comparison of per cent contrasts (%) 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 88.95 80.36 77.35 71.82 59.65 54.13  
  AC + RR 73.37 65.86 64.64 56.71 46.45 43.12  < 0.001a
  AC + SC 58.30 42.81 32.41 15.69 8.91 7.41  < 0.001b
16:1 AC + SC + RR 92.82 79.25 85.58 62.21 59.91 48.74  
  AC + RR 76.85 64.98 71.41 51.78 51.15 37.85  < 0.001a
  AC + SC 80.79 66.69 60.76 43.97 28.20 23.83 0.001b
8:1 AC + SC + RR 78.65 71.05 64.37 57.63 43.49 39.34  
  AC + RR 69.73 65.77 50.55 52.58 37.50 32.00 0.002a
  AC + SC 77.93 63.92 38.94 38.93 28.40 22.11 0.011b
4:1 AC + SC + RR 99.94 76.67 72.83 66.09 45.03 65.30  
  AC + RR 80.81 62.67 64.85 51.79 39.67 45.96 0.002a
  AC + SC 77.03 63.33 41.89 38.29 9.28 40.53  < 0.001b
  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