ADMM-EM Method for -Norm Regularized Weighted Least Squares PET Reconstruction

Table 2

Inner and outer iteration numbers to meet in (26). For Case , we fix 120 inner iterations for the greedy ADMM algorithms; for Case , we fix 400 outer iterations.

Algorithm	Iteration number
Case : given inner iteration number	Outer iteration number
ADMM-PL-120	292
ADMM-CG-120	71
ADMM-EM-120	68
ADMM-EM-1	256
Case : given outer iteration number	Inner iteration number
ADMM-PL-400	20
ADMM-CG-400	11
ADMM-EM-400	1