This book develops the statistical approach to inverse problems with an emphasis on modeling and computations.  The framework is the Bayesian paradigm, where all variables are modeled as random variables, the randomness reflecting the degree of belief of their values, and the solution of the inverse problem is expressed in terms of probability densities.  The book discusses in detail the construction of prior models, the measurement noise modeling and Bayesian estimation.  Markov Chain Monte Carlo-methods as well as optimization methods are examples that are often non-trivial but easy to follow.  Besides the simple examples, the book contains problems as discretization errors, and statistical model reduction.  Furthermore, the techniques are then applied to a number of real world applications such as limited angle tomography, image deblurring, electical impedance tomography, and biomagnetic inverse problems.  The book is intended for researchers and advanced students in applied mathematics, computational physics, and engineering.  The first part of the book can be used as a text book on advanced inverse problems courses.

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