In English

Regularization in microwave tomography

Alexey Voronov
Göteborg : Chalmers tekniska högskola, 2007. 58 s. Ex - Institutionen för signaler och system, Chalmers tekniska högskola, ISSN 99-2747920-4; EX079/2007, 2007.
[Examensarbete på avancerad nivå]

Microwave tomography is a promising method for the breast cancer imaging. Dielectric properties of the healthy tissue and the tumor have a high contrast under microwave investigation. To determine the dielectric properties from antenna measurements it is necessary to solve the inverse electromagnetic problem. This inverse problem is ill-posed, its solution is not stable. Regularization is used to achieve stability. Ordinary Tikhonov regularization usually makes the solution too smooth. Edge-preserving regularization is investigated to obtain a stable solution without oversmoothing the solution. Tikhonov and Edge-preserving regularizations are compared. It is found that edge-preserving regularization decreases the smoothness of the reconstruction but has the same robustness against the noise compared to Tikhonov regularization.

Nyckelord: tomography, tissue properties, FDTD, optimization, regularization



Publikationen registrerades 2007-10-09. Den ändrades senast 2013-04-04

CPL ID: 52390

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