Table 3.
Effect of examined parameters on background ACrec and N in comparison to a reference protocola
| Parameter of variation | ΔACrec | pb | ΔN | pb |
|---|---|---|---|---|
| (kBq/ml) | (%) | |||
| SCF: 0.41 | + 1.7 | < 0.0001 | − 6.0 | 0.02 |
| Iteration set: 4i/10s | − 0.1 | n.s.d | + 22.0 | < 0.0001 |
| Iteration set: 5i/15s | − 0.1 | n.s.d | + 35.3 | < 0.0001 |
| Iteration set: 24i/10s | − 0.2 | n.s.d | + 68.1 | < 0.0001 |
| Acquisition: NEMAc | + 0.7 | < 0.0001 | − 4.1 | n.s.d |
aClinical standard for diagnostic imaging and reconstruction (60 projections with 20 s/projection, SCF1.10, 2i/10s, Butterworth postfilter)
bANOVA post hoc test
cNEMA acquisition protocol (120 projections and 10 s/projection)
dNot significant, tested by ANOVA
SCF scatter weighting factor, ACrec mean reconstructed activity concentration, N noise