[Sparse angular CT projection onto convex set reconstruction using nonlocal means iterative modification].
Based on the fact that nonlocal means (NL-means) filtered image can likely produce an acceptable priori solution, we propose a sparse angular CT projection onto convex set (POCS) reconstruction using NL-means iterative modification. The new reconstruction scheme consists of two components, POCS and NL-means filter. In each phase of the sparse angular CT iterative reconstruction, we first used POCS algorithm to meet the identity and non-negativity of projection data, and then performed NL-means filter to the image obtained by POCS method for image quality improvement. Simulation experiments showed that the proposed POCS scheme can significantly improve the quality of sparse angular CT image by suppressing the noise and removing the streak-artifacts.
Liu
Nan
N
Laboratory of Medical Information, School of Biomedical Engineering, Southern Medical University, Guangzhou 510515, China. lnan1985@fimmu.com
Huang
Jing
J
Ma
Jian-hua
JH
Lu
Li-jun
LJ
Feng
Qian-jin
QJ
Chen
Wu-fan
WF
D000465:Algorithms; D007091:Image Processing, Computer-Assisted / Q000379:methods; D014057:Tomography, X-Ray Computed / Q000379:methods*