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Table 1 Main characteristics of the four SPECT-CT systems used in the study

From: Quantitative capabilities of four state-of-the-art SPECT-CT cameras

Name SPECT detector NEMA spatial resolution awith LEHR collimator (mm) CT b
   Planar SPECT Central SPECT Peripheral  
     Radial Tangential  
General Electric Discovery NM/CT 670 3/8 in. NaI crystal 7.4 ≤9.9 ≤9.9 ≤7.5 80, 100, 120, and 140 kV
  59 PMT      10 to 440 (100) mA
  1 ADC/PMT      0.5, 0.6, 1.0, and 1.5 s rotation time (in spiral mode)
  40 × 54 cm FOV      24 rows - maximum 16 slices/rotation
General Electric Infinia Hawkeye 4 3/8 in. NaI crystal 7.4 ≤9.9 ≤9.9 ≤7.5 120 and 140 kV
  59 PMT      1.0, 1.5, 2.0, and 2.5 mA
  1 ADC/PMT      2.0 or 2.6 rpm gantry rotation
  40 × 54 cm FOV      4 rows - 4 slices per rotation
Philips Brightview XCT 3/8 in. NaI crystal 7.4 ≤10.3 ≤10.5 ≤9.0 120 kV
  59 PM      2.5, 5, 10, 15, and 20 mA
  1 ADC/PMT      12 s (fast) and 60 s (slow) rotation times
  40.6 × 54 cm FOV      CsI flat panel 14 cm axial FOV detector
Siemens Symbia T series 3/8 in. NaI crystal 7.4 ≤11.4 ≤11.7 ≤8.4 80, 110, and 130 kV
  59 PMT      T2: 30 to 240 (100) mA; 0.8, 1.0, 1.5 s rotation time; 2 rows - 2 slices/rotation
  38.7 × 53.3 cm FOV      T6: 20 345 (100) mA; 0.6, 0.8, 1.0, 1.5 s rotation time; 16 rows - maximum 6 slices/rotation
       T16: 20 to 345 mA; 0.5, 0.6, 1.0, and 1.5 s rotation time; 24 rows - maximum 16 slices/rotation
  1. aFull width at half maximum (at 100 mm for planar, with 15 cm rotation radius for SPECT) without scatter; bunderlined values are values used in this study. ADC, analog to digital converter; CT, computed tomography; FOV, field of view; NEMA, National Electrical Manufacturers Association, PMT, photomultiplier tube; SPECT, single-photon emission computed tomography.