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In many inverse problems a functional of u is given by measurements where u solves a partial differential equation of the type L(p)u + Su = q. Here, q is a known source term and L(p), S are operators with p as unknown parameter of the inverse problem. For the numerical reconstruction of p often the heuristically derived Fréchet derivative R of the mapping R… (More)

We give a short account of the history of CT from motion tomography in the early 1930's to sprial CT. We discuss the physical and the mathematical background. Finally we give an outlook on possible future developments of CT and related techniques. I. INTRODUCTION In 1895, Röntgen first indicated that X-rays could be used to image internal structures such as… (More)

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