Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2013, Vol. 24 ›› Issue (2): 020102 doi: 10.13538/j.1001-8042/nst.2013.02.008


An experimental study of dual-energy CT imaging using synchrotron radiation

HAO Jia1,2 ZHANG Li1,2 XING Yuxiang1,2 KANG Kejun1,2   

  1. 1Department of Engineering Physics, Tsinghua University, Beijing 100084, China
    2Key Laboratory of Particle & Radiation Imaging (Tsinghua University), Ministry of Education, Beijing 100084, China
  • Received:2012-08-05
  • Contact: ZHANG Li E-mail:
HAO Jia, ZHANG Li, XING Yuxiang, KANG Kejun. An experimental study of dual-energy CT imaging using synchrotron radiation.Nuclear Science and Techniques, 2013, 24(2): 020102     doi: 10.13538/j.1001-8042/nst.2013.02.008


The measurement of electron density is important for medical diagnosis and charged particle radiotherapy treatment planning. Traditionally, electron density is obtained by CT imaging using the relationship between CT-number and electron densities established beforehand. However, the measurement is not accurate due to the beam hardening effect. In this paper, we propose a simple and practical electron density acquisition method based on dual-energy CT technique. For each sample, the CT imaging is conducted using two selected X-ray energy from synchrotron radiation. A post-processing dual-energy reconstruction method is used. Linear attenuation coefficients of the scanned samples are obtained by FBP reconstruction. The effective atomic number and electron density are got by solving the dual-energy simultaneous equations. Different phantoms and breast tissues were scanned in this experimental study under 10 keV and 30 keV monochromatic X-rays. The distribution of effective atomic numbers and electron densities of the scanned phantoms were obtained by Dual-energy CT image reconstruction, which agrees well with the theoretical values. Compared with conventional methods, the measurement accuracy is greatly improved, and the measurement error is reduced to about 1%. This experimental study demonstrates that DECT imaging based on synchrotron radiation source is applicable to medical diagnosis for quantitative measurement with high accuracy.

Key words: Dual-energy CT, Synchrotron radiation, Electron density, X-ray imaging