2015
DOI: 10.1137/140978272
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Randomize-Then-Optimize for Sampling and Uncertainty Quantification in Electrical Impedance Tomography

Abstract: Abstract. In a typical inverse problem, a spatially distributed parameter in a physical model is estimated from measurements of model output. Since measurements are stochastic in nature, so is any parameter estimate. Moreover, in the Bayesian setting, the choice of regularization corresponds to the definition of the prior probability density function, which in turn is an uncertainty model for the unknown parameters. For both of these reasons, significant uncertainties exist in the solution of an inverse proble… Show more

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Cited by 16 publications
(3 citation statements)
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“…In the case of the selected regularization, the feasible set of parameters is in the same range for both absolute and difference imaging, and all the estimates are relatively tolerant with respect to the choices of parameters, given that the parameters are in the feasible range-these observations were made based on simulations, but they can be justified based on the Bayesian interpretations of the prior models. For the Bayesian interpretation of the parameters of the model (22), see [59,60]. For a Bayesian intepretation of the TV model ( 23) and an approximation for the selection of the parameter α based on the expected magnitude of the changes in f, see [61].…”
Section: Simulated Datamentioning
confidence: 99%
“…In the case of the selected regularization, the feasible set of parameters is in the same range for both absolute and difference imaging, and all the estimates are relatively tolerant with respect to the choices of parameters, given that the parameters are in the feasible range-these observations were made based on simulations, but they can be justified based on the Bayesian interpretations of the prior models. For the Bayesian interpretation of the parameters of the model (22), see [59,60]. For a Bayesian intepretation of the TV model ( 23) and an approximation for the selection of the parameter α based on the expected magnitude of the changes in f, see [61].…”
Section: Simulated Datamentioning
confidence: 99%
“…The use of a low‐rank surrogate of H Q has also been explored in References 9,10 and is similar to Method 1 (cf, Section 4.1) that we propose. Other approaches to sampling from the posterior distribution include randomize‐then‐optimize 30,31 and randomized MAP approach 32 . However, none of these methods can handle the case where Q −1 or Q −1/2 is not available.…”
Section: Sampling From the Posterior Distributionmentioning
confidence: 99%
“…The use of a low-rank surrogate of H Q has also been explored in [10,11] and is similar to Method 1 (c.f., subsection 4.1) that we propose. Other approaches to sampling from the posterior distribution include randomize-then-optimize (RTO) [5,4] and randomized MAP approach [45]. However, none of these methods can handle the case where Q −1 or Q −1/2 are not available.…”
Section: Sampling From the Posterior Distributionmentioning
confidence: 99%