| Beam hardening correction for a cone-beam CT system and its effect on spatial resolution |
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| 作者姓名： | 赵维 付国涛 孙翠丽 王燕芳 魏存峰 曹大泉 阙介民 唐晓 史戎坚 魏龙 郁忠强 |
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| 作者单位： | 1. Key Laboratory of Nuclear Analytical Techniques, Institute of High Energy Physics, CAS, Beijing 100049, China;;2. Beijing Engineering Research Center of Radiographic Techniques and Equipment, Beijing 100049, China;;3. Graduate University of Chinese Academy of Sciences, Beijing 100049, China |
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| 基金项目： | Supported by National Natural Science Foundation of China(10905063); Instrument Developing Project of Chinese Academy of Sciences(2010024) |
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| 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.
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| 关 键 词： | 射束硬化校正 空间分辨率 CT系统 CT图像重建 锥束 调制传递函数 MTF值 点扩散函数 |
| 收稿时间： | 2011-1-24 |
| 修稿时间： | 2011-4-18 |
Beam hardening correction for a cone-beam CT system and its effect on spatial resolution |
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| ZHAO Wei ,, FU Guo-Tao , SUN Cui-Li , WANG Yan-Fang , WEI Cun-Feng , CAO Da-Quan , QUE Jie-Min , TANG Xiao , SHI Rong-Jian , WEI Long , YU Zhong-Qiang , Key Laboratory of Nuclear Analytical Techniques.Beam hardening correction for a cone-beam CT system and its effect on spatial resolution[J].High Energy Physics and Nuclear Physics,2011,35(10):978-985. |
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| Authors: | ZHAO Wei FU Guo-Tao SUN Cui-Li WANG Yan-Fang WEI Cun-Feng CAO Da-Quan QUE Jie-Min TANG Xiao SHI Rong-Jian WEI Long YU Zhong-Qiang Key Laboratory of Nuclear Analytical Techniques |
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| Institution: | ZHAO Wei 1,2,3,1 FU Guo-Tao 1,3 SUN Cui-Li 1,2 WANG Yan-Fang 1,2 WEI Cun-Feng 1,2 CAO Da-Quan 1,3 QUE Jie-Min 1,2 TANG Xiao 1,3 SHI Rong-Jian 1,2 WEI Long 1,2 YU Zhong-Qiang 1,2 1 Key Laboratory of Nuclear Analytical Techniques,Institute of High Energy Physics,CAS,Beijing 100049,China 2 Beijing Engineering Research Center of Radiographic Techniques and Equipment,China 3 Graduate University of Chinese Academy of Sciences,China |
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| Abstract: | 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 e... |
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| Keywords: | beam hardening correction cone-beam computed tomography spatial resolution |
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