Fig. 5

The effect of shortening the acquisition time for the Veriton system. SPECT data of a NEMA IQ phantom scan with 24.9 million counts was used as a reference. (Left) The relative absolute difference of the mean sphere-to-background ratios compared to the reference scan and calculated over the four largest spheres, increased exponentially with a decreasing number of counts or reduced scanning time. (Right) Reducing the scanning time and thus reducing the number of counts resulted in an exponential increase of the background CoV, relative to the reference scan