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Table 2 Summary of acquisition and processing parameters used. See text for full details

From: Inter-comparison of quantitative imaging of lutetium-177 (177Lu) in European hospitals

  Site
1 2 3 4 5 6 7
Camera Siemens Symbia T2 Siemens Symbia T2 GE Infinia Hawkeye 4 Siemens Intevo Ge Optima 640 Siemens Symbia T6 GE Discovery 670
Collimator ME ME MEGP ME MEGP MELP MEGP
Crystal thickness 5/8″ 3/8″ 3/8″ 3/8″ 3/8″ 3/8″ 5/8″
Photopeak(s), keV 113 ± 7.5% 113 ± 10% 113 ± 10%
208 ± 10% 208 ± 10% 208 ± 10% 208 ± 10% 208 ± 10% 208 ± 10% 208 ± 10%
Scatter window(s), keV 98.7 ± 5%
131 ± 5%
176.8 ± 5% 178 ± 5% 178 ± 5%
239.2 ± 5% 214 ± 5% 214 ± 5%
Orbit type Contoured Circular Contoured Contoured Contoured Circular Contoured
Matrix 128 × 128 128 × 128 128 × 128 128 × 128 128 × 128 128 × 128 128 × 128
Number of projections 120 120 120 120 120 120 120
Time per projection 30 s 30 s 30 s 30 s 30 s 30 s 60 s *
Reconstruction type OSEM OSEM OSEM OSEM OSEM OSEM OSEM
Iterations/subsets 6/6 8/4 16/5 24/24 5/10 5/15 8/10
Attenuation correction CT CT CT CT CT CT CT
Scatter correction TEW No Monte Carlo TEW TEW Monte Carlo ESSE
Resolution recovery Yes No Yes Yes No Yes Yes
Segmentation method CT VOI + 10 mm SPECT threshold CT VOI CT VOI CT VOI CT VOI CT VOI plus SPECT auto-threshold
  1. *The activity of the source used at site H7 was approximately 50% of that used in all other sites, so the acquisition time was doubled to compensate for this