A Katsevich 2008 Inverse Problems 24 045012 doi:10.1088/0266-5611/24/4/045012
A Katsevich
Show affiliationsIn this paper we develop local tomography (LT) for image reconstruction from motion contaminated data. It is assumed that motion is known. We propose a new LT function fΛ, which is related to an original object f via an operator
:
. Because of motion,
may fail to be a pseudo-differential operator (PDO). We obtain the conditions that guarantee that
is a PDO. Under these conditions, similarly to the classical LT in
is a PDO of order 1. Computation of fΛ depends on a weight function Φ. We show that Φ can be chosen in such a way that the operator
has principal symbol |ξ|. This result has an interesting corollary for conventional exact reconstruction. It suggests a novel frequency-split approach to finding f from motion contaminated data. In practice tomographic data are discrete, and derivatives are usually replaced by their mollified analogs. We consider how mollification affects the singularities of the LT function fΛ. Using this approach we develop an algorithm for finding values of jumps of f using LT. We also consider various aspects of numerical implementation of LT and show the results of numerical experiments.
92C55 Biomedical imaging and signal processing (See also 44A12, 65R10)
Issue 4 (August 2008)
Received 10 March 2008, in final form 15 May 2008
Published 24 June 2008
A Katsevich 2008 Inverse Problems 24 045012
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