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Table 1 NRMSE in the sphere VOIs and COV% and RCmean in the background ROIs for 68Ga PET, qSPECT, OSEM + RM and SPECTRE. BKG is the background compartment of the phantom

From: Theranostic SPECT reconstruction for improved resolution: application to radionuclide therapy dosimetry

Sphere Diameter (mm) 68Ga PET 3it21s NRMSE qSPECT 4it8s NRMSE OSEM + RM 40it12s NRMSE SPECTRE 40it12s NRMSE
37 0.25 0.41 0.30 0.26
28 0.31 0.57 0.42 0.35
22 0.37 0.67 0.45 0.41
17 0.41 0.75 0.49 0.49
13 0.49 0.80 0.61 0.54
10 0.60 0.85 0.70 0.54
BKG RCmean 0.99 0.95 1.04 1.03
BKG COV% 4.1 8.7 20.0 4.3