Beam hardening correction for a cone-beam CT system and its effect on spatial resolution

被引：3

作者：

赵维 ^{[1
,2
,3
]}

付国涛 ^{[1
,2
,3
]}

孙翠丽 ^{[1
,2
]}

王燕芳 ^{[1
,2
]}

魏存峰 ^{[1
,2
]}

曹大泉 ^{[1
,2
,3
]}

阙介民 ^{[1
,2
]}

唐晓 ^{[1
,2
,3
]}

史戒坚 ^{[1
,2
]}

魏龙 ^{[1
,2
]}

郁忠强 ^{[1
,2
]}

机构：

[1] Key Laboratory of Nuclear Analytical Techniques,Institute of High Energy Physics,CAS

[2] Graduate University of Chinese Academy of Sciences

[3] Beijing Engineering Research Center of Radiographic Techniques and Equipment

来源：

中国物理C | 2011年 / 35卷 / 10期

基金：

中国国家自然科学基金;

关键词：

beam hardening correction; cone-beam computed tomography; spatial resolution;

D O I：

暂无

中图分类号：

O434.1 [X射线]; TP391.41 [];

学科分类号：

070207 ; 080203 ; 0803 ;

摘要：

In this paper,we present a beam hardening correction (BHC) method in three-dimension space for a cone-beam computed tomography (CBCT) system in a mono-material case and investigate its effect on the spatial resolution.Due to the polychromatic character of the X-ray spectrum used,cupping and streak artifacts called beam hardening artifacts arise in the reconstructed CT images,causing reduced image quality.In addition,enhanced edges are introduced in the reconstructed CT images because of the beam hardening effect.The spatial resolution of the CBCT system is calculated from the edge response function (ERF) on different planes in space.Thus,in the CT images with beam hardening artifacts,enhanced ERFs will be extracted to calculate the modulation transfer function (MTF),obtaining a better spatial resolution that deviates from the real value.Reasonable spatial resolution can be obtained after reducing the artifacts.The 10% MTF value and the full width at half maximum (FWHM) of the point spread function with and without BHC are presented.

引用

页码：978 / 985

页数：8

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