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Titolo:
Electrical capacitance tomography: image reconstruction along electrical field lines
Autore:
Loser, T; Wajman, R; Mewes, D;
Indirizzi:
Univ Hannover, Inst Proc Engn, D-30167 Hannover, Germany Univ Hannover Hannover Germany D-30167 c Engn, D-30167 Hannover, Germany Tech Univ Lodz, Dept Comp Engn, PL-90924 Lodz, Poland Tech Univ Lodz Lodz Poland PL-90924 ept Comp Engn, PL-90924 Lodz, Poland
Titolo Testata:
MEASUREMENT SCIENCE & TECHNOLOGY
fascicolo: 8, volume: 12, anno: 2001,
pagine: 1083 - 1091
SICI:
0957-0233(200108)12:8<1083:ECTIRA>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
SYSTEM;
Keywords:
electrical capacitance tomography; image reconstruction; ART; electrical field calculation; FEM;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Loser, T Univ Hannover, Inst Proc Engn, Callinstr 36, D-30167 Hannover, Germany Univ Hannover Callinstr 36 Hannover Germany D-30167 ver, Germany
Citazione:
T. Loser et al., "Electrical capacitance tomography: image reconstruction along electrical field lines", MEAS SCI T, 12(8), 2001, pp. 1083-1091

Abstract

For image reconstruction in electrical capacitance tomography (ECT) various implementations of the linear backprojection (LBP) algorithm and iterative reconstruction techniques have become the standard in most applications. Most implementations suffer from a smoothing effect and lack of accuracy due to their smooth sensitivity maps and the so-called 'soft' field problem in ECT, respectively. Therefore it is usually difficult in capacitance tomography to reconstruct objects with sharp contours. In the present paper a novel reconstruction model based on a finite-element-method (FEM) calculationis introduced. The model is derived directly from linear (x-ray) tomography, wherein weighting matrices along the rays are calculated. By analogy, weighting matrices in ECT are calculated numerically along the paths of the electrical field lines, which are influenced by the distribution of the various permittivities in the measurement plane. Finally the image reconstruction is done by implementing these new weighting matrices within standard iteration techniques (ART and LBP). With the new algorithm even objects with sharp contours can be reconstructed. The results are more detailed and accurate tomograms.

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Documento generato il 25/01/20 alle ore 16:11:34