Table 5.
QSPECT patient validation
| No. | Dose (GBq) | Body volume (L) |
Body background (SUV)a,b | Body activity (SUV L)b |
Dead-time count loss (%) |
Deviation (%) |
||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Totalc | Scannedd | Extra-scan | Scanned | Extra-scane | Total | Bed 1 | Bed 2 | DTCb | No DTCf | |||
| 1 | 8.3 | 82.0 | 54.9 | 27.1 | 0.43 | 67.8 | 11.7 | 79.5 | 10.8 | 6.8 | −3.1 | −12.2 |
| 2 | 8.3 | 71.0 | 46.5 | 24.5 | 0.47 | 57.7 | 11.4 | 69.1 | 10.4 | 7.2 | −2.6 | −11.6 |
| 3 | 7.9 | 74.6 | 39.5 | 35.1 | 0.16 | 66.0 | 5.7 | 71.7 | 7.1 | 11.7 | −3.8 | −15.1 |
| 4 | 10.2 | 103.5 | 67.7 | 39.8 | 0.41 | 87.2 | 16.3 | 103.5 | 7.7 | 11.6 | 0.0 | −10.2 |
| 5 | 7.9 | 78.0 | 45.9 | 32.1 | 0.43 | 60.3 | 13.9 | 74.2 | 9.5 | 6.9 | −4.9 | −14.0 |
| 5 | 9.1 | 78.0 | 51.9 | 26.1 | 0.47 | 65.1 | 12.2 | 77.3 | 11.3 | 6.6 | −1.0 | −10.3 |
aAverage activity concentration in volumes of interest over shoulder and thigh.
bQSPECT data with dead-time correction (DTC).
cBased on patient’s weight, assuming that 1 g = 1 cm3 and 1 kg = 1 L.
dBased on CT.
eExtrapolated from body volume outside FOV and body background activity concentration.
fSPECT data corrected for attenuation, scatter and sensitivity, but not for dead-time.