衍射增强成像的若干基础问题研究 Ⅰ衍射增强成像的衬度与X射线能量的关系  

Studies on some basic problems about diffraction enhanced imaging Ⅰ. Relation between the contrast of imaging and the energy of X-rays

作　　者：刘成林[1,2] 闫晓辉[1] 张新夷[1,3] 朱佩平[4] 黄万霞[4] 袁清习[4] 

机构地区：[1]复旦大学同步辐射研究中心复旦大学物理系,应用表面物理国家重点实验室,上海200433 [2]盐城师范学院物理系,北京100049 [3]上海针灸和经络研究所 [4]中国科学院高能物理研究所

出　　处：《核技术》2006年第12期881-884,共4页Nuclear Techniques

基　　金：国家重点基础研究专项973项目(2005CB523306);江苏省高校自然科学基础研究项目(06KJD140199)资助

摘　　要：为了探讨X射线衍射增强成像的衬度与X射线能量的关系,利用北京同步辐射光源4W1A光束线引出的硬X射线对大块正常和癌变的乳腺组织进行成像研究。在摇摆曲线顶部位置获得的图像(峰位图像)和表观吸收图像的衬度随X射线能量的变化关系是相似的,说明峰位图像和表观吸收图像包含的主要衬度相似,即吸收衬度,而折射图像的衬度随X射线能量的增大总体上呈现下降趋势。综合来看,对于乳腺类的软组织来说,DEI成像在低能量端有很好的衬度,反映了衍射增强成像更适合于主要由轻元素组成的物体的成像。For discussing the relation between the contrast of X-ray diffraction enhanced imaging （DEI） and the energy of X-rays, the massive samples of breast tissue including normal and cancerous were studied with the DEI method using the hard X-rays from 4W1A beamline at the Beijing Synchrotron Radiation Facility （BSRF）. The results show that the contrasts of the peak-position image or apparent absorption image keep unchanged when different X-ray energies are used. The contrast of refraction image trends to be weakened when the X-ray energy is increased. As a result, it seems the DEI method is fit to image objects made of light elements.

关 键 词：X射线衍射增强成像 衬度 X射线能量 同步辐射 乳腺组织 

分 类 号：O434.1[机械工程—光学工程] R817.1[理学—光学]