Previous Normal Dose Scan Induced Nonlocal Means Gibbs Prior for Low Dose Computed Tomography Maximum A Posteriori Reconstruction
Lower X-ray radiation to patient in computed tomography (CT) examination is clinically desired.Although reducing the level of milliampere-seconds (mAs) can yield lowdose CT scan,the associated image quality will be strongly degraded by excessive quantum noise.In this paper,for obtaining high-quality image in low-mAs or low-dose CT scan,we propose a previous normal dose scan induced nonlocal means Gibbs prior,named as ndiNLMGP.The ndiNLMGP was designed based on the normal-dose scan induced nonlocal means filter (ndiNLM) by exploiting the huge redundancy information from the high-quality reference image.And the associated optimization algorithm was developed based on maximum a posteriori (MAP) criterion for image reconstruction.To validate and evaluate the performance of the present ndiNLMGP,we carried out the low-dose image reconstruction from the computer simulated and real data.The results show that the present ndiNLMGP can impressively outperform the simplex nonlocal means Gibbs prior (NLMGP) model in lowering the noise,and preserving the edge and details in the desired images.
X-ray computed tomography low dose nonlocal means maximum a posteriori
Z. Bian J. Ma J. Huang H. Zhang L. Lu Y. Gao Y. Zhang Z. Liang W. Chen
Department of Biomedical Engineering, Southern Medical University, Guangzhou 510515, China Department of Biomedical Engineering, Southern Medical University, Guangzhou 510515, China;Departmen Department of Radiology, State University of New York, Stony Brook, NY 11794, USA
国际会议
World Congress on Medical Physics and Biomedical Engineering (2012年医学物理及生物医学工程国际会议(IFMBE))
北京
英文
827-830
2012-05-26（万方平台首次上网日期，不代表论文的发表时间）