Fig. 3
From: Optimisation of the air fraction correction for lung PET/CT: addressing resolution mismatch
Workflow for the point source insertion-and-subtraction method for kernel determination; a simulated GT emission; b forward-projected and attenuated GT emission; c simulated single-voxel point source; d forward-projected and attenuated point source; e difference image between AC reconstructed and post-filtered (\(h_{PF}\) = 6 mm) PET with perturbation and without; f simulated single-voxel point source convolved with \(h_{pts}\) and down-sampled to PET voxel (vx) size. “Minimise RMSE in VOIs” refers to the six VOIs in the lung