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电子学报  2015 

基于配准的肺4D-CT图像超分辨率重建

DOI: 10.3969/j.issn.0372-2112.2015.02.027, PP. 383-386

Keywords: 肺4D-CT数据,超分辨率重建,ActiveDemons配准,projectionontoconvexset(POCS)算法

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Abstract:

肺4D-CT数据在肺癌治疗中有重要意义.但肺4D-CT数据纵向(Z方向)分辨率低,为显示正确比例图像需进行插值运算,由此带来图像的模糊.本文提出了一种基于ActiveDemons配准的超分辨率重建技术来提高肺4D-CT图像分辨率.我们将不同相位同一位置的低分辨率图像视为不同"帧"图像.首先采用ActiveDemons配准方法得到不同"帧"图像之间的运动估计;而后采用凸集投影(ProjectionOntoConvexSet,POCS)超分辨率算法重建高分辨率肺图像.实验结果表明,与三次样条插值和反投影方法相比较,我们的方法能得到更清晰的肺图像,明显增强图像结构.

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