On Algorithms Based on Joint Estimation of Currents and Contrast in Microwave Tomography

Autor:	Barri��re, Paul-Andr��, Idier, J��r��me, Goussard, Yves, Laurin, Jean-Jacques
Jazyk:	angličtina
Rok vydání:	2009
Předmět:	FOS: Computer and information sciences 45Q05 62G05 Information Theory (cs.IT) Computer Science - Information Theory FOS: Mathematics Numerical Analysis (math.NA) Mathematics - Numerical Analysis
Popis:	This paper deals with improvements to the contrast source inversion method which is widely used in microwave tomography. First, the method is reviewed and weaknesses of both the criterion form and the optimization strategy are underlined. Then, two new algorithms are proposed. Both of them are based on the same criterion, similar but more robust than the one used in contrast source inversion. The first technique keeps the main characteristics of the contrast source inversion optimization scheme but is based on a better exploitation of the conjugate gradient algorithm. The second technique is based on a preconditioned conjugate gradient algorithm and performs simultaneous updates of sets of unknowns that are normally processed sequentially. Both techniques are shown to be more efficient than original contrast source inversion. 12 pages, 12 figures, 5 tables
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9fc48cde2dbaea16b168a5de2d171b2a http://arxiv.org/abs/0901.4723 Zobrazit plný text záznamu