Table 1 Characteristics of all used SPECT/CT systems with LEHR collimator
System | Discovery NM/CT 670 Pro | Precedence 6 | Symbia Intevo 6 | Symbia T16 |
|---|---|---|---|---|
Detector crystal | 3/8” NaI | 3/8” NaI | 3/8” NaI | 3/8” NaI |
PMT* | 59 | 55 | 59 | 59 |
FOV* | 40 × 54 cm | 38.1 × 50.8 cm | 38.7 × 53.3 cm | 38.7 × 53.3 cm |
Hole shape | Hexagonal | Hexagonal | Hexagonal | Hexagonal |
Number of holes (× 1000) | Not specified | 86.4 | 148 | 148 |
Collimator hole diameter | 1.50 mm | 1.40 mm | 1.11 mm | 1.11 mm |
Hole length | 35 mm | 32.8 mm | 24.05 mm | 24.05 mm |
Septal thickness | 0.2 mm | 0.152 mm | 0.16 mm | 0.16 mm |
Sensitivity for 99mTc @ 10 cm | 72 cps/MBq | 66 cps/MBq | 91 cps/MBq | 91 cps/MBq |
Septal penetration @ 140 keV | 0.3% | 1.3% | 1.5% | 1.5% |
Planar resolution† | 7.4 mm | 7.4 mm | 7.5 mm | 7.5 mm |
SPECT central resolution† | 6.4 mm | 4.4 mm | 4.4 mm | 4.4 mm |
SPECT peripheral radial resolution† | 5.7 mm | 4.2 mm | 4.0 mm | 4.0 mm |
SPECT peripheral tangential resolution† | 5.1 mm | 4.3 mm | 3.9 mm | 3.9 mm |