天津大学学报（英文版）
天津大學學報（英文版）
천진대학학보（영문판）
Transactions of Tianjin University
2015年
6期
524-532
,共9页
孙云山%张立毅%张海燕%张经宇
孫雲山%張立毅%張海燕%張經宇
손운산%장립의%장해연%장경우
blind image restoration%variable splitting%alternating direction method%medical CT image
Computed tomography(CT) blurring caused by point spread function leads to errors in quantification and visualization. In this paper, multichannel blind CT image restoration is proposed to overcome the effect of point spread function. The main advantage from multichannel blind CT image restoration is to exploit the diversity and redundancy of information in different acquisitions. The proposed approach is based on a variable splitting to obtain an equivalent constrained optimization formulation, which is addressed with the alternating direction method of multipliers and simply implemented in the Fourier domain. Numerical experiments illustrate that our method ob-tains a higher average gain value of at least 1.21 dB in terms ofQ metric than the other methods, and it requires only 7 iterations of alternating minimization to obtain a fast convergence.
