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

作     者：HAO Jia ZHANG Li XING Yuxiang KANG Kejun 

作者机构：Department of Engineering PhysicsTsinghua University Key Laboratory of Particle & Radiation Imaging(Tsinghua University)Ministry of Education 

出 版 物：《Nuclear Science and Techniques》 (核技术（英文）)

年 卷 期：2013年第24卷第2期

页      面：7-11页

核心收录：

学科分类：08[工学] 080203[工学-机械设计及理论] 0802[工学-机械工程] 

基　　金：supported by National Key Technology R&D Program of the Ministry of Science and Technology(No.2012BA107B05) 

主　　题：同步辐射光源 CT成像 实验 有效原子序数 电子密度 测量精度 线性衰减系数 CT图像重建 

摘      要：The measurement of electron density is important for medical diagnosis and charged particle radiotherapy treatment ***,electron density is obtained by CT imaging using the relationship between CT-number and electron densities established ***,the measurement is not accurate due to the beam hardening *** this paper,we propose a simple and practical electron density acquisition method based on dual-energy CT *** each sample,the CT imaging is conducted using two selected X-ray energy from synchrotron radiation.A post-processing dual-energy reconstruction method is *** attenuation coefficients of the scanned samples are obtained by FBP *** effective atomic number and electron density are got by solving the dual-energy simultaneous *** phantoms and breast tissues were scanned in this experimental study under 10 keV and 30 keV monochromatic *** 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 *** 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.