Table 4.
QSPECT phantom validation
| No. | Calibrated activity (MBq) |
QSPECT activity (MBq)a |
Deviation (%)a |
Dead-time count loss (%) | Total deviation no DTC (%)b | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| A | B | C | Total | A | B | C | Total | A | B | C | Total | |||
| 1 | 22.6 | 0 | 0 | 22.6 | 20.5 | – | – | 20.5 | −9.5 | – | – | −9.5 | 0.0 | −9.5 |
| 2 | 78.7 | 0 | 0 | 78.7 | 82.1 | – | – | 82.1 | 4.3 | – | – | 4.3 | −0.2 | 4.1 |
| 3 | 75.3 | 0 | 314 | 390 | 71.6 | – | 302 | 373 | −5.0 | – | –4.0 | −4.2 | −0.9 | −5.0 |
| 4 | 75.2 | 146 | 314 | 535 | 65.9 | 131 | 315 | 512 | −12.4 | −10.2 | 0.4 | −4.3 | −1.3 | −5.6 |
| 5 | 75.0 | 146 | 940 | 1160 | 63.9 | 131 | 903 | 1100 | −14.9 | −10.2 | −3.9 | −5.4 | −2.9 | −8.2 |
| 6 | 650 | 145 | 938 | 1730 | 616 | 139 | 891 | 1650 | −5.2 | −4.3 | −5.0 | −5.0 | −4.4 | −9.1 |
| 7 | 373 | 83.4 | 538 | 994 | 360 | 73.4 | 498 | 932 | −3.4 | −12.0 | −7.4 | −6.3 | −2.5 | −8.6 |
A and B, cylindrical insert compartments (175 cm3); C, large cylinder compartment (2,500 cm3).
aQSPECT data with dead-time correction (DTC).
bSPECT data corrected for attenuation, scatter and sensitivity, but not for dead-time.