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Titolo:
An improved data acquisition method for electrical impedance tomography
Autore:
Kerner, TE; Hartov, A; Osterman, KS; DeLorenzo, C; Paulsen, KD;
Indirizzi:
Dartmouth Coll, Thayer Sch Engn, Hanover, NH 03755 USA Dartmouth Coll Hanover NH USA 03755 hayer Sch Engn, Hanover, NH 03755 USA
Titolo Testata:
PHYSIOLOGICAL MEASUREMENT
fascicolo: 1, volume: 22, anno: 2001,
pagine: 31 - 38
SICI:
0967-3334(200102)22:1<31:AIDAMF>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
DISTINGUISHABILITY; ALGORITHM;
Keywords:
EIT; electrical impedance; imaging; data acquisition; synthesized trigonometric patterns;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
9
Recensione:
Indirizzi per estratti:
Indirizzo: Kerner, TE Dartmouth Coll, Thayer Sch Engn, Hanover, NH 03755 USA Dartmouth Coll Hanover NH USA 03755 ngn, Hanover, NH 03755 USA
Citazione:
T.E. Kerner et al., "An improved data acquisition method for electrical impedance tomography", PHYSL MEAS, 22(1), 2001, pp. 31-38

Abstract

Isaacson, Cheney and Seager have demonstrated that simultaneously applyingtrigonometric patterns of current to a circular electrode array optimizes the sensitivity of EIT to inner structure. We have found that it is less desirable to measure voltage at an electrode that also applies a current due to variable contact impedance. In order to preserve the optimum sensitivitywhile minimizing the effect of electrode artefacts, we have devised an approach where we sequentially apply a current between each individual electrode and a separate, fixed ground while measuring voltages at all other electrodes for each consecutive current impulse. By adding weighted sums of boththe applied currents and corresponding measured voltages from individual passes, we can synthesize trigonometric patterns of any spatial frequency. Since only one of the electrodes in any given acquired data set is used as asource, this approach significantly dilutes the effect of contact impedance on the resulting voltage measurements. We present simulated data showing the equivalency between the synthesized and actual trigonometric excitationpatterns. In addition, we report experimental data, both in vitro and in vivo, that show improved results using this data acquisition technique.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/09/20 alle ore 22:05:40