Fig. 8

Ratio of mean concentration in the threshold-based VOIs (50% and 60% of peak value) and actual concentration and volume of these VOIs for the QSPECT reconstruction (a, b), the fQSPECT reconstruction (c, d) and the Bayesian reconstruction (e, f). Data for VOIs based on 50% and 60% of the peak value are indicated by solid and open symbols, respectively. The dashed lines in a, c, e indicate a ratio of unity, while in b, d, f they represent the lines of identity and the dash-dotted lines indicate the volume of a ø20 sphere. The solid lines indicate the fit of Eq. (5) for the 50% of peak value method