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1、,医学物理学 同步辐射原理与医学应用,张新夷 物理楼243室 65643522 xy- http:/,第二讲 同步辐射医学成像进展,Won the first Nobel Prize in Physics in 1901.,Roentgen began the practice of radiology by presenting an X-ray photograph of his wifes hand in January of 1896.,RADIOLOGY more than one CENTURY - by American College of Radiology,1895 Roe
2、ntgen discovers the X ray on November 8. 1896 Roentgens discovery launches rapidly a flurry of experimentation around the world. In March, a “Roentgen photograph” is introduced as evidence in a courtroom. Hospitals begin acquiring X-ray equipment.,The “first radiograph of the human brain” is actuall
3、y a pan of cat intestines.,This image was made by Francis Williams of Boston, one of the first radiologists, in March 1896.,1900,1896,Angiographic work began in January, 1896, with this post-mortem injection of mercury compounds.,First use a contrast medium,1901 Roentgen wins the first Nobel Laureat
4、e in Physics prize. 1904 Edisons assistant in X-ray research, dies of extreme and repeated X-ray exposure. 1919 Dr. Carlos Heuser, an Argentine radiologist, is the first to use a contrast medium in a living human circulatory system.,First practices of modern angiography,19201929 Chest X rays are use
5、d to screen for tuberculosis Roentgen dies February 10, 1923. Drs. Graham and Cole discover in 1923 how to visualize the gall bladder with X rays by using contrast media. The first practices of modern angiography are developed in 1927 by a Portuguese physician, who is the first to create images of t
6、he circulatory system in the living brain.,The first image of a human coronary artery recorded in vivo with SR. This coronary angiogram was done at the SSRL in May 1986.,An image of a human coronary artery recorded in vivo at the NSLS, in Nov. 1992. Improvements in the imaging system have increased
7、the quality of the angiogram.,First “tomograph”,19301939 In 1936, the first “tomograph”, an X-ray “slice” of the body, is presented at a radiology meeting. and foreshadows the development in the 1970s of CT. 19501959 Dr. W. Goodwin introduces the concept of X-ray guided nephrostomy.,肾造口术,Finding bre
8、ast cancers with high accuracy,19601969 In 1960, Dr. Robert Egan publishes the results of an intensive, three-year study of mammography, with an accuracy in finding breast cancers is remarkable (9799%). Drs. Dotter and Judkins are the first to report performing an angioplasty.,血管重建术,CT, Angioplasty,
9、19701979 CT, or computed tomography, which takes X-ray “slices” of the body and images them on a computer screen, is introduced. With the addition of computer technology, to create 3-dimensional images. Swiss physician Dr. Andreas Gruntvig invents balloon angioplasty.,1980Today Phase contrast imagin
10、g for soft tissues with SR. Teleradiology, the ability to send images through the “information superhighway,” is introduced.,Phase contrast imaging， Teleradiology,1900,1920,1940,1980,Roentgen photograph,Angiographic work,Tomograph,CT,1960,Use contrast medium in a living human,1896,1919,1936,1986,189
11、5,Chest X rays to screen for TB,1920s,2000,1927,First practices of modern angiography,1960,Mammography,1970s,Phase contrast imaging with SR,2000,First human coronary angiogram with SR,How is the story of a century of medical radiology,To improve on the faint images, borrowing from advances in physic
12、s, chemistry, pharmacology, nuclear science, computers, telemetry and information science, is the story of a century of medical radiology. A century later, the vastly more sophisticated arts of medical imaging are still based upon the recognition that body parts absorb X rays according to their dens
13、ity.,吸收衬度成像,吸收衬度成像是利用X-射线在穿透样品时，样品对X-射线的吸收系数不同从而引起吸收强度的不同来记录图像的。,吸收衬度成像,冠状动脉血管造影,How is the story of medical radiology in the future,SR-based imaging might change medical practice. To observe inside of various organs is the story of medical radiology. The future more sophisticated arts of medical im
14、aging are based upon the recognition that body parts absorb X rays according to their density, as well as the change of phase.,位相衬度成像,位相衬度成像是利用空间相干的X-射线透过样品后携带的位相信息来成像。 位相衬度成像是近几年发展起来的一种新的成像方法，与吸收衬度成像相比，这种技术的敏感度要高1000倍。这样，就可以对神经组织、肺腺泡结构等成像，以及在不用造影剂的情况下来显示软组织的内部结构。,absorption,scattering,refraction,Sa
15、mple,X-rays,Absorption Refraction Extinction (small angle scattering free),N(,k)=nR(,k)+inI(,k),Diffraction Enhanced Imaging (DEI),在分析晶体接受角范围内，X-射线的衍射强度依赖于入射角，这种关系称为摇摆曲线。,N(,k)=nR(,k)+inI(,k),At top “pure” absorption (absorption and small angle scattering rejected) Ileft+Iright aparent absorption (a
16、bsorption including small angle scattering) Ileft- Iright refraction imaging,Three kinds of images are usually recorded.,Diffraction image,+,Apparent absorption image,-,Refraction image,衍射增强成像结果（脚趾）,传统的同步辐射图像,同步辐射衍射增强图像,IL-XPCT in-line X-ray phase contrast computerized tomography,中极穴,中极穴旁开,足三里穴,足三里穴旁开,考试题,选择以下一篇文章为主题，作口头报告，重点说明同步辐射在科学研究中的作用。 揭示生命能量之源-ATP合酶三维结构的同步辐射研究，田亮、张新夷，核技术, 26(1)2(2003). 细胞膜通
