Fig. 3

Results for the CFs for the reconstructions with a filter applied with ²¹²Pb. In panel a, the CFs are plotted for different reconstructions with error bars showing the SDs of the CFs calculated at activities above 1 MBq. In panel b, the plot shows CVs of the CFs plotted for different reconstructions. The corresponding results for images without a filter can be found in the supplementary material. In panel c, the data points from which the CFs were calculated for the 30 × 4 reconstruction are plotted against activity for all four image protocols with a filter applied. The sharp increase in CFs as activity decays below 1 MBq can be seen in the plot. In panel d, high activity maximum intensity projection images of the homogeneous phantom are presented for each of the imaging protocols with a 12-mm filter and the 30 × 4 reconstruction. The scale is set the same for all the images, to illustrate the different count rates, with the white set to 25 counts and the black being 0 counts