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Table 3 Effect of examined parameters on background ACrec and N in comparison to a reference protocola

From: Optimization of SPECT/CT imaging protocols for quantitative and qualitative 99mTc SPECT

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
  1. aClinical standard for diagnostic imaging and reconstruction (60 projections with 20 s/projection, SCF1.10, 2i/10s, Butterworth postfilter)
  2. bANOVA post hoc test
  3. cNEMA acquisition protocol (120 projections and 10 s/projection)
  4. dNot significant, tested by ANOVA
  5. SCF scatter weighting factor, ACrec mean reconstructed activity concentration, N noise