| CT断层重建中滤波函数设计的新方法 |
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| 引用本文： | 石本义,王成,陈四海,毕昆.CT断层重建中滤波函数设计的新方法[J].CT理论与应用研究,2010,19(4):35-43. |
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| 作者姓名： | 石本义 王成 陈四海 毕昆 |
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| 作者单位： | [1]华中科技大学光电子科学与工程学院,武汉430074 [2]北京农业信息技术研究中心,北京100097 |
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| 摘 要： | 滤波函数在CT图像重建过程中起着非常重要的作用,直接关系到重建图像质量。为了提高CT重建图像质量,本文从加权平均的思想出发,根据FBP重建算法的理论基础,提出一种设计滤波函数的新思路,并分析了五点加权平均滤波函数性能比较。最后针对Shepp-Logan模型数据和实际的海螺投影数据,设计出一种新的滤波函数并与S-L和R-L滤波函数的重建效果进行了比较。从比较结果可以看出,新设计的滤波函数重建的图像效果在整体性能上最好,在局部地方,其密度分辨率有所提高。本文为滤波函数的设计提出了一种新的想法和思路。
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| 关 键 词： | 滤波函数 CT图像重建 FBP 加权平均 |
A Novel Method of CT Reconstruction Filter Function Design |
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| SHI Ben-yi,WANG Cheng,CHEN Si-hai,BI Kun.A Novel Method of CT Reconstruction Filter Function Design[J].Computerized Tomography Theory and Applications,2010,19(4):35-43. |
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| Authors: | SHI Ben-yi WANG Cheng CHEN Si-hai BI Kun |
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| Institution: | 1.College of Optoelectronic Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China 2.Beijing Research Center for Information Technology in Agriculture,Beijing 100097,China |
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| Abstract: | The design of filter function is very important in the CT reconstruction.In order to improve the image quality,a new method of filter function design was presented based on the FBP theory.Based on the simulated data of Shepp-Logan and the projection data of conch,the compared result of CT reconstruction using R-L filter function,S-L filter function and a new filter function based on the new design method was given.The reconstruction result of the new design filter function was the best in overall performance.In local areas,the density resolution had increased.So this paper provided a novel method for filter function designing in CT reconstruction. |
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| Keywords: | filter function CT reconstruction FBP weighted average |
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