Fig. 2From: Hybrid kernelised expectation maximisation for Bremsstrahlung SPECT reconstruction in SIRT with 90Y micro-spheresExample of parameter optimisation for the FHKEM. a shows the trade-off between ROI mean (kBq/ml) and CoV for the parameter \(\sigma _{\mathrm{ds}}\); b shows the trade-off between ROI mean and CoV for the iteration where the kernel is frozen, for patient 4Back to article page