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清华大学学报(自然科学版)  2016, Vol. 56 Issue (12): 1346-1351    DOI: 10.16511/j.cnki.qhdxxb.2016.25.045
  核能与新能源工程 本期目录 | 过刊浏览 | 高级检索 |
改进的多层螺旋CT线性插值算法
万欣, 刘锡明, 苗积臣, 吴志芳
清华大学 核能与新能源技术研究院, 核检测技术北京市重点实验室, 北京 100084
Improved linear interpolation algorithm for multi-slice helical CT
WAN Xin, LIU Ximing, MIAO Jichen, WU Zhifang
Beijing Key Laboratory of Nuclear Detection and Measurement Technology, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
全文: PDF(2440 KB)  
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摘要 线性插值是多层螺旋CT的基础重建算法之一,基本原理是搜寻重建平面上下2组投影数据进行插值,而搜寻数据及计算权重函数过程会大大降低重建效率。该文提出了一种改进的适用于一定螺距范围的线性插值算法,以4层螺旋CT为例,给出了不同探测器排投影数据的权重函数,可直接用于插值计算,从而提高重建效率。通过模拟三维Shepp-Logan头部模型投影数据,验证了该算法的重建效果和适用范围。结果表明:该算法在中小螺距范围内重建效果好,图像还原能力高,在保证重建图像质量的同时,拥有较大的体积覆盖率,可用于需要快速重建的情况。
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万欣
刘锡明
苗积臣
吴志芳
关键词 多层螺旋CT (MSCT)线性插值算法重建图像螺距    
Abstract:Linear interpolation (LI) is one of the basic reconstruction algorithms for multi-slice helical CT (MSCT) which searches for the upper and lower projection data sets adjacent to the reconstructed slice for interpolation. However, the searching for the data and computing the weighting function significantly reduces the reconstruction efficiency. An improved LI method was developed for a range of helical pitches with a 4-slice helical CT as an example. The algorithm defines the projection data weighting function from different detector rows, which can be used directly for interpolation to increase the reconstruction efficiency. The 3D projection data for the Shepp-Logan head phantom was simulated to verify the reconstruction capability and the applicable range of this method. The results show that this method does well for moderate and small helical pitches. The image restoration capacity is very good and the volume coverage is quite fast with good image quality. This method can be used in situations requiring fast reconstruction.
Key wordsmulti-slice helical CT (MSCT)    linear interpolation algorithm    reconstructed image    helical pitch
收稿日期: 2016-02-26      出版日期: 2016-12-15
ZTFLH:  TP301.6  
通讯作者: 吴志芳,研究员,E-mail:zhifang.wu@tsinghua.edu.cn     E-mail: zhifang.wu@tsinghua.edu.cn
引用本文:   
万欣, 刘锡明, 苗积臣, 吴志芳. 改进的多层螺旋CT线性插值算法[J]. 清华大学学报(自然科学版), 2016, 56(12): 1346-1351.
WAN Xin, LIU Ximing, MIAO Jichen, WU Zhifang. Improved linear interpolation algorithm for multi-slice helical CT. Journal of Tsinghua University(Science and Technology), 2016, 56(12): 1346-1351.
链接本文:  
http://jst.tsinghuajournals.com/CN/10.16511/j.cnki.qhdxxb.2016.25.045  或          http://jst.tsinghuajournals.com/CN/Y2016/V56/I12/1346
  图1 4SCT_h~4螺旋扫描共轭区域
  图2 三维SL头部模型透视图及z=0处剖面图
  图3 SL模型在4SCT下的仿真投影数据
  图4 三种算法对不同螺距扫描投影的重建图像
  图5 h=3时3种算法重建图像第128行灰度曲线
  图6 h=4时3种算法重建图像第128行灰度曲线
  图7 h=6时3种算法重建图像第128行灰度曲线
  图8 三种算法重建图像归一化平均绝对距离
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