基于投影加权的多能光子计数X线CT全能谱图像重建改进方法

发布时间：2018-03-08 10:49

本文选题：光子计数　切入点：X线CT　出处：《东南大学学报(自然科学版)》2016年06期 　论文类型：期刊论文

【摘要】：为了提高多能光子计数X线CT全能谱重建图像的对比噪声比,提出了一种基于投影加权的图像重建改进方法.首先,针对包含不同对比材料的3种模体进行投影仿真,获得包含泊松噪声和高斯噪声的投影正弦图;然后,从投影正弦图中提取噪声信息,构造关于权重的对比噪声比优化函数;最后,求解出使对比噪声比最优的权重,利用该权重进行投影加权图像重建,并对重建图像进行评估.实验结果表明:与当前仅考虑泊松噪声的基于投影加权的图像重建方法相比,对于含钙材料的模体,利用改进方法可明显提高重建图像的对比噪声比;对于含碘材料和等效软组织材料的模体,利用改进方法重建的图像对比噪声比则无显著统计差异.
[Abstract]:In order to improve the contrast noise ratio of multi-energy photon counting X-ray CT omnipotent spectrum reconstruction image, an improved image reconstruction method based on projection weighting is proposed. Firstly, three kinds of motifs containing different contrast materials are simulated by projection. The projection sinusoidal graph containing Poisson noise and Gao Si noise is obtained. Then, the noise information is extracted from the projection sinusoidal graph, and the optimization function of the contrast noise ratio about the weight is constructed. Finally, the optimal weight of the contrast noise ratio is solved. The weight is used to reconstruct the projected weighted image, and the reconstructed image is evaluated. The experimental results show that compared with the current projection-weighted image reconstruction method which only considers Poisson noise, The improved method can obviously improve the contrast noise ratio of reconstructed images, while for the motifs of iodine containing materials and equivalent soft tissue materials, the contrast noise ratio of reconstructed images with the improved method has no significant statistical difference.
【作者单位】：南京航空航天大学核科学与工程系;
【基金】：国家自然科学基金资助项目(51575256) 中央高校基本科研业务费专项资金资助项目(NP2015101) 江苏高校优势学科建设工程资助项目
【分类号】：TP391.41

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