Please wait a minute...
 首页  期刊介绍 期刊订阅 联系我们 横山亮次奖 百年刊庆
 
最新录用  |  预出版  |  当期目录  |  过刊浏览  |  阅读排行  |  下载排行  |  引用排行  |  横山亮次奖  |  百年刊庆
清华大学学报(自然科学版)  2016, Vol. 56 Issue (6): 672-676    DOI: 10.16511/j.cnki.qhdxxb.2016.22.031
  工程物理 本期目录 | 过刊浏览 | 高级检索 |
用单一光源标定光子计数探测器
冯初晴, 沈淇, 康克军, 邢宇翔
清华大学 工程物理系, 粒子技术与辐射成像教育部重点实验室, 北京 100084
Energy calibration of photon counting detectors using a single monochromatic source
FENG Chuqing, SHEN Qi, KANG Kejun, XING Yuxiang
Key Laboratory of Particle and Radiation Imaging of Ministry of Education, Department of Engineering Physics, Tsinghua University, Beijing 100084, China
全文: PDF(2847 KB)  
输出: BibTeX | EndNote (RIS)      
摘要 光子计数探测器在X光能谱CT成像中应用越来越广泛。受到脉冲堆叠、 电荷共享等物理作用的影响, 目前的光子计数探测器的能量标定方法具有一定的局限性。该文提出了一种只用一个单能光源对探测器进行标定的方法, 通过充分挖掘及利用有限的数据, 运用迭代的方法, 最终确定探测器各阈值所对应的能量。该方法不仅实验量小, 操作简单, 标定结果较准确, 还考虑了对小像素探测器标定有较大影响的电荷共享问题, 且具有普适性, 对其他光子计数探测器的标定也有一定的帮助。
服务
把本文推荐给朋友
加入引用管理器
E-mail Alert
RSS
作者相关文章
冯初晴
沈淇
康克军
邢宇翔
关键词 光子计数探测器能谱CT能量标定电荷共享    
Abstract:Photon counting detectors (PCDs) are important in spectral X-ray imaging and computed tomography (CT) systems. Various PCD energy calibration methods have been developed but have many limitations because of the influences of the pulse pileup, charge sharing and other physical effects. This paper describes a calibration method using only one monochromatic source. An iterative technique is used to fully analyze the data to determine the energy for various thresholds. The method gives good results with fewer tests than other calibration methods. The charge sharing effect is implicitly corrected, which is an important factor in the calibration of small pixel detectors. This method is quite universal and can be used to calibrate other PCDs.
Key wordsphoton counting detector    spectral computed tomography (CT)    energy calibration    charge sharing
收稿日期: 2014-12-09      出版日期: 2016-07-01
ZTFLH:  TL816+.1  
通讯作者: 邢宇翔, 副研究员, E-mail: xingyx@tsinghua.edu.cn     E-mail: xingyx@tsinghua.edu.cn
引用本文:   
冯初晴, 沈淇, 康克军, 邢宇翔. 用单一光源标定光子计数探测器[J]. 清华大学学报(自然科学版), 2016, 56(6): 672-676.
FENG Chuqing, SHEN Qi, KANG Kejun, XING Yuxiang. Energy calibration of photon counting detectors using a single monochromatic source. Journal of Tsinghua University(Science and Technology), 2016, 56(6): 672-676.
链接本文:  
http://jst.tsinghuajournals.com/CN/10.16511/j.cnki.qhdxxb.2016.22.031  或          http://jst.tsinghuajournals.com/CN/Y2016/V56/I6/672
  图1 确定TOTGE 关系的迭代步骤流程图
  图2 光子计数探测器标定实验装置
  图3 未校正的单色光源241Am 的TOT能谱
  图4 校正后的放射性同位素241Am 源的TOT能谱
  图5 光子计数探测器不同阈值[50,90]所对应的能量
  图6 未校正的放射性同位素155Eu源的TOT能谱
  图7 校正后的放射性同位素155Eu源的TOT能谱
[1] Llopart X, Campbell M, San Segundo D, et al. Medipix2, a 64k pixel read out chip with 55 μm square elements working in single photon counting mode [C]//Nuclear Science Symposium Conference Record, 2001 IEEE. San Diego, CA, USA, 2001, 3: 1484-1488.
[2] Llopart X, Ballabriga R, Campbell M, et al. Timepix, a 65k programmable pixel readout chip for arrival time, energy and/or photon counting measurements [J]. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2007, 581(1): 485-494.
[3] Fiederle M, Greiffenberg D, Idárraga J, et al. Energy calibration measurements of MediPix2 [J]. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2008, 591(1): 75-79.
[4] Pellegrini G, Chmeissani M, Maiorino M, et al. Performance limits of a 55 μm pixel CdTe detector [C]//Nuclear Science Symposium Conference Record, 2004 IEEE. Rome, Italy, 2004, 4: 2104-2109.
[5] Ponchut C. Correction of the charge sharing in photon-counting pixel detector data [J]. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2008, 591(1): 311-313.
[6] Taguchi K, Iwanczyk J S. Vision 20/20: Single photon counting X-ray detectors in medical imaging [J]. Medical Physics, 2013, 40(10), 100901.
[7] Greiffenberg D, Fauler A, Zwerger A, et al. Energy resolution and transport properties of CdTe-Timepix-Assemblies [J]. Journal of Instrumentation, 2011, 6(1), C01058.
[8] Zwerger A, Fauler A, Fiederle M, et al. Medipix2: Processing and measurements of GaAs pixel detectors [J]. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2007, 576(1): 23-26.
[9] Jakubek J, Cejnarova A, Holy T, et al. Pixel detectors for imaging with heavy charged particles [J]. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2008, 591(1): 155-158.
[10] Youn H, Han J C, Kam S, et al. Energy calibration of energy-resolved photon-counting pixel detectors using laboratory polychromatic X-ray beams [J]. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2014, 760: 79-85.
[11] Jakubek J. Precise energy calibration of pixel detector working in time-over-threshold mode [J]. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2011, 633: S262-S266.
[12] Ponchut C, Ruat M. Energy calibration of a CdTe X-ray pixel sensor hybridized to a Timepix chip [J]. Journal of Instrumentation, 2013, 8(1), C01005.
No related articles found!
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
版权所有 © 《清华大学学报(自然科学版)》编辑部
本系统由北京玛格泰克科技发展有限公司设计开发 技术支持:support@magtech.com.cn