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Table 1 Imaging conditions and collimator configurations regarding the four state-of-the-art SPECT/CT systems

From: Use of a digital phantom developed by QIBA for harmonizing SUVs obtained from the state-of-the-art SPECT/CT systems: a multicenter study

  Brightview XCT Discovery NM/CT 670 Infinia Hawkeye 4 Symbia T6
Imaging condition
 Step and shoot image acquisition
  No. of step 30 30 30 30
  Rotation angle 6 6 6 6
  No. of projection 60 60 60 60
  Scan orbit body contour body contour body contour body contour
 Size for image acquisition
  Matrix (x, y, z) 132, 132, 132 128, 128, 128 128, 128, 128 128, 128, 128
  Pixel size and slice thickness (mm) 4.7 4.4 4.4 4.8
 Smoothing filter 3D Gaussian 3D Gaussian 3D Gaussian 3D Gaussian
 Reconstructed image for ROI analysis
  Matrix (x, y, z) 256, 256, 203 256, 256, 207 256, 256, 130 256, 256, 187
  Pixel size and slice thickness (mm) 2.0 2.0 2.2 2.0
 Energy window
  Main 140.5 keV ± 10% 140.5 keV ± 10% 140 keV ± 10% 140 keV ± 10%
  Sub N.A. 120 keV ± 5% 120 keV ± 5% 120 keV ± 5%
 Attenuation correction CT-based CT-based CT-based CT-based
 Scatter correction ESSE DEW DEW DEW
Collimator
 Type CHR LEHR LEHR LEHR
 No. of holes (thousand) 40.2 86.3 86.3 148
 Hole shape Hexagon Hexagon Hexagon Hexagon
 Hole length (mm) 48 35 35 24.1
 Septal thickness (mm) 0.15 0.20 0.20 0.16
 Hole diameter across the flats (mm) 2.03 1.50 1.50 1.11
  1. ESSE effective source scatter estimation method. DEW dual-energy window method, CHR cardiac high-resolution collimator, LEHR low-energy high-resolution collimator, N.A. not applicable