技术发展-历史发展 1917奥地利数学家雷当提出CT成像原理 1967年Hounsfield在英国EMI公司实验中心从 事计算机和重建技术研究工作 1971年9月第一台CT机安装于Atkinson- Morley's医院，一幅图像的处理时间为 20min左右 1974年美国George Townl医学中心工程师设 计出全身CT扫描机
技术发展-历史发展 1917奥地利数学家雷当提出CT成像原理 1967年Hounsfield在英国EMI公司实验中心从 事计算机和重建技术研究工作 1971年9月第一台CT机安装于AtkinsonMorley’s医院，一幅图像的处理时间为 20min左右 1974年美国George Town医学中心工程师设 计出全身CT扫描机
Hounsfield和Cormack因发明CT获得 1979年诺贝尔医学和生理学奖。 G.N.Hounsfield A.M.Cormack Central Research Tufts University Laboratories, Medford,MA,USA London Electric and Musical Industries 百代唱片公司
Hounsfield和Cormack因发明CT获得 1979年诺贝尔医学和生理学奖。 Central Research Laboratories, EMI London G. N. Hounsfield A. M. Cormack Tufts University Medford, MA, USA Electric and Musical Industries 百代唱片公司
Johann Radon Born:16 Dec 1887 in Tetschen, Bohemia(now Decin,Czech Republic) Died:25 May 1956 in Vienna,Austria He worked on the Calculus of variations. Differential geometry and Measure theory. Johann Radon entered the University of Vienna where he was awarded a doctorate in 1910 for a dissertation on the calculus of variations.The year 1911 he spent in Gottingen. became assistant professor at the University of Brunn(now Brno)for a year and then moved to the Technische Hochschule in Vienna. In 1919 Radon became assistant professor at Hamburg becoming a full professor in Greifswald in 1922.He was appointed to the University of Vienna in 1947 and he remained there for the rest of his life
Johann Radon entered the University of Vienna where he was awarded a doctorate in 1910 for a dissertation on the calculus of variations. The year 1911 he spent in Göttingen, became assistant professor at the University of Brünn (now Brno) for a year and then moved to the Technische Hochschule in Vienna. In 1919 Radon became assistant professor at Hamburg becoming a full professor in Greifswald in 1922. He was appointed to the University of Vienna in 1947 and he remained there for the rest of his life. Johann Radon Born: 16 Dec 1887 in Tetschen, Bohemia (now Decin, Czech Republic) Died: 25 May 1956 in Vienna, Austria He worked on the Calculus of variations, Differential geometry and Measure theory
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件目病（国文台（工真①D视图固W带助山 会日B色的圈区4,1◆◆⊙124%·田□回四回P ⑧·目，·业~图日04是T, Appendix A TRANSLATION OF RADONS 1917 PAPER 0 (c)For an arbitrary point P-[x.yl and anyr0.let Translation of Radon's 1917 Paper* Lr)+rco.y+rsin)d Then for every point P. m(-=0. Thus the following theorems hold. If one integrates a function of two variables x,y-a point-fimnction f(P)in the Theorem I.The integral of along the straight line g with the equation plane-that satisfies suitable regularity conditions,along an arbitrary straight xcos◆+ysin◆-p,given by line g,then the values F(g)of these integrals define a line-function.The (0) version of this functional e牌hydw% Tha wing questions are given:Is every Fn.)-氏-n.+)-广pms◆-sim◆，psin◆+a)杰 process?If this is the case,is the point-function fthen uniquely determined by F and how can it be found? The problem of finding a line-function F(g)from the mean values over its EraePmm pons)which the dual problem.in part B. alizations that P icularly from Theorem II.If the mean value of F(p,)is formed for the tangent lines of the circle with center P-[x,y]and radius Interesting in themselves,the treatment of these problems is gaining even more interest because of the fact that there are numerous relations between this () 以g)=xcos◆+yin◆+，)d4 then this integral is absolutely convergent for all P. A.DETERMINATION OF A POINT-FUNCTION IN THE /ar的dand c PLANE FROM ITS INTEGRALS ALONG STRAIGHT LINES (0) -@ (a)(x.y)is continuous Here the integral is to be understood in the Stieltjes sense and it can also be (b)The following double integral,which is to be taken over the whole defined by the formula: plane,is convergent: 川偿學 () -=(0-厂0 Before starting with the proof of these theorems.we note that conditions