A harmonic-mean preconditioner that combines data-fidelity and prior Hessian information makes subset-based PET reconstruction with the relative difference prior converge faster and more reliably.
Teoh, Daniel R
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Fast PET Reconstruction with Variance Reduction and Prior-Aware Preconditioning
A harmonic-mean preconditioner that combines data-fidelity and prior Hessian information makes subset-based PET reconstruction with the relative difference prior converge faster and more reliably.