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Mathematics > Numerical Analysis

arXiv:1808.01493 (math)
[Submitted on 4 Aug 2018]

Title:Variational regularization of the weighted conical Radon transform

Authors:Markus Haltmeier, Daniela Schiefeneder
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Abstract:Recovering a function from integrals over conical surfaces recently got significant interest. It is relevant for emission tomography with Compton cameras and other imaging applications. In this paper, we consider the weighted conical Radon transform with vertices on the sphere. Opposed to previous works on conical Radon transform, we allow a general weight depending on the distance of the integration point from the vertex. As first main result, we show uniqueness of inversion for that transform. To stably invert the weighted conical Radon transform, we use general convex variational regularization. We present numerical minimization schemes based on the Chambolle-Pock primal dual algorithm. Within this framework, we compare various regularization terms, including non-negativity constraints, $H^1$-regularization and total variation regularization. Compared to standard quadratic Tikhonov regularization, TV-regularization is demonstrated to significantly increase the reconstruction quality from conical Radon data.
Subjects: Numerical Analysis (math.NA)
Cite as: arXiv:1808.01493 [math.NA]
  (or arXiv:1808.01493v1 [math.NA] for this version)
  https://doi.org/10.48550/arXiv.1808.01493
Related DOI: https://doi.org/10.1088/1361-6420/aae9a3

Submission history

From: Markus Haltmeier [view email]
[v1] Sat, 4 Aug 2018 15:33:38 UTC (1,076 KB)
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