摘要
双能X射线CT成像技术可以精确地获得被扫描物体中的电子密度分布,对于医疗诊断和癌症放射治疗具有重要的参考价值。为了提高双能CT重建精度,该文提出了一种基于同步辐射光源的双能CT成像方法,并对相干光的后处理重建算法进行了研究。同步辐射光源具有一系列的优势。使用不同物质进行双能CT成像数值模拟可以发现:采用同步辐射光源进行双能CT重建,可以更加精确地获取被扫描物质的等效原子序数及电子密度,误差远小于使用X光机的传统双能CT系统。结果表明,基于同步辐射光源的双能CT成像技术将成为生物医学中定量研究的重要手段。目前,中国已经在上海建造成第三代同步辐射光源,为双能CT成像的进一步研究提供了条件。
The distribution of electron density can be obtained by dual-energy imaging technology with high precision,which is important for medical diagnosis and treatment planning in the radiotherapy.A dual-energy CT imaging method was developed using synchrotron radiation to improve the reconstruction,with the interference light post-processing algorithm analyzed for reconstruction.Numerical simulations with different materials were implemented using the post-processing reconstruction method to show that the electron density and effective atomic number can be obtained with high precision,with much less error than that of conventional dual-energy CT system using Bremsstrahlung radiation.The results also show that dual-energy X-ray CT using synchrotron radiation has the potential to be an important tool for quantitative measurement in biological research.China has developed a third-generation synchrotron radiation light source in Shanghai,which provides an excellent scientific platform for the further research of dual-energy CT imaging.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2011年第4期457-461,共5页
Journal of Tsinghua University(Science and Technology)
关键词
双能量CT
电子密度
同步辐射
X射线成像
dual-energy CT
electron density
synchrotron radiation
X-ray imaging
