Convergence optimization of parametric MLEM reconstruction for estimation of Patlak plot parameters

TY - JOUR

T1 - Convergence optimization of parametric MLEM reconstruction for estimation of Patlak plot parameters

AU - Angelis, Georgios I.

AU - Thielemans, Kris

AU - Tziortzi, Andri C.

AU - Turkheimer, Federico E.

AU - Tsoumpas, Charalampos

PY - 2011/7

Y1 - 2011/7

N2 - In dynamic positron emission tomography data many researchers have attempted to exploit kinetic models within reconstruction such that parametric images are estimated directly from measurements. This work studies a direct parametric maximum likelihood expectation maximization algorithm applied to [F-18]DOPA data using reference-tissue input function. We use a modified version for direct reconstruction with a gradually descending scheme of subsets (i.e. 18-6-1) initialized with the FBP parametric image for faster convergence and higher accuracy. The results compared with analytic reconstructions show quantitative robustness (i.e. minimal bias) and clinical reproducibility within six human acquisitions in the region of clinical interest. Bland-Altman plots for all the studies showed sufficient quantitative agreement between the direct reconstructed parametric maps and the indirect FBP (-0.035x + 0.48E-5). (C) 2011 Elsevier Ltd. All rights reserved.

AB - In dynamic positron emission tomography data many researchers have attempted to exploit kinetic models within reconstruction such that parametric images are estimated directly from measurements. This work studies a direct parametric maximum likelihood expectation maximization algorithm applied to [F-18]DOPA data using reference-tissue input function. We use a modified version for direct reconstruction with a gradually descending scheme of subsets (i.e. 18-6-1) initialized with the FBP parametric image for faster convergence and higher accuracy. The results compared with analytic reconstructions show quantitative robustness (i.e. minimal bias) and clinical reproducibility within six human acquisitions in the region of clinical interest. Bland-Altman plots for all the studies showed sufficient quantitative agreement between the direct reconstructed parametric maps and the indirect FBP (-0.035x + 0.48E-5). (C) 2011 Elsevier Ltd. All rights reserved.

U2 - 10.1016/j.compmedimag.2011.01.002

DO - 10.1016/j.compmedimag.2011.01.002

M3 - Article

VL - 35

SP - 407

EP - 416

JO - Computerized Medical Imaging and Graphics

JF - Computerized Medical Imaging and Graphics

IS - 5

ER -