Optimisation of Simultaneous Tl-201/Tc-99m Dual Isotope Reconstruction with Monte-Carlo-Based Scatter Correction

Table 4

The contrast values for the down-scatter optimisation. In this table myocardium versus defect and myocardium versus left ventricle (LV) contrasts are presented for the down-scatter optimisation. The contrast values were calculated for Phantom 3 for the anterior defect. The Tc-99m image that served as an input for the down-scatter simulation was reconstructed using the parameters optimised in the previous step.

Number of simulated photons in Tl-201 reconstruction	Number of down-scatter simulated photons	Number of scatter update iterations in Tl-201 reconstruction	Myocardium versus defect contrast	Myocardium versus LV contrast
10^6	10^5	10	0.67	0.90
10^6	10^6	10	0.67	0.89
10^6	10^7	10	0.68	0.89