The use of Cole-Cole plots to compare two multi-frequencybioimpedance instruments
Identifieur interne : 00C489 ( Main/Exploration ); précédent : 00C488; suivant : 00C490The use of Cole-Cole plots to compare two multi-frequencybioimpedance instruments
Auteurs : D. B. Stroud [Australie] ; B. H. Cornish ; B. J. Thomas ; L. C. Ward [Australie]Source :
- Clinical Nutrition [ 0261-5614 ] ; 1995.
Abstract
Abstract: Two commercially available multi-frequency bioimpedance spectrometers (Xitron 4000B and SEAC SFB3) were compared by performing measurements on a set of electronic circuits and by studying 14 healthy volunteers. Output data were plotted as reactance versus resistance and fitted with a semicircle using a least squares fitting program. In tests with six electronic circuits both instruments produced impedance loci that were well described by semicircular Cole-Cole plots, though there were some minor discrepancies using the Xitron instrument at frequencies above 150 kHz. When tested on the volunteers the SEAC instrument gave very good fits (RMSE = 1.5 Ω) to a semicircle from 5-600 kHz on all volunteers. The Xitron instrument gave excellent fits to the semicircle between 5 and 55 kHz (RMSE = 0.7 Ω) but above 55 kHz the phase measurements stayed constant or even increased, confirming the anomalous behaviour reported by other authors. The conclusions to be drawn are that the semicircular plots predicted by the Cole-Cole theory give a very good description of multifrequency impedance data recorded by the SEAC SFB3 instrument, on human subjects, for frequencies between 5 and 600 kHz. The Xitron 4000B is not able to reproduce the theoretically expected results in humans above 55 kHz.
Url:
DOI: 10.1016/S0261-5614(95)80069-7
Affiliations:
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B." last="Stroud">D. B. Stroud</name><affiliation wicri:level="1"><country xml:lang="fr">Australie</country><wicri:regionArea>Medical Physics Department, Monash Medical Centre, Melbourne</wicri:regionArea><wicri:noRegion>Melbourne</wicri:noRegion></affiliation><affiliation></affiliation></author><author><name sortKey="Cornish, B H" sort="Cornish, B H" uniqKey="Cornish B" first="B. H." last="Cornish">B. H. Cornish</name><affiliation><wicri:noCountry code="subField"></wicri:noCountry></affiliation></author><author><name sortKey="Thomas, B J" sort="Thomas, B J" uniqKey="Thomas B" first="B. J." last="Thomas">B. J. Thomas</name><affiliation><wicri:noCountry code="subField"></wicri:noCountry></affiliation></author><author><name sortKey="Ward, L C" sort="Ward, L C" uniqKey="Ward L" first="L. C." last="Ward">L. C. Ward</name><affiliation wicri:level="1"><country xml:lang="fr">Australie</country><wicri:regionArea>Department of Biochemistry,University of Queensland, Brisbane, Q 4072</wicri:regionArea><wicri:noRegion>Q 4072</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">Clinical Nutrition</title><title level="j" type="abbrev">YCLNU</title><idno type="ISSN">0261-5614</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1995">1995</date><biblScope unit="volume">14</biblScope><biblScope unit="issue">5</biblScope><biblScope unit="page" from="307">307</biblScope><biblScope unit="page" to="311">311</biblScope></imprint><idno type="ISSN">0261-5614</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0261-5614</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Abstract: Two commercially available multi-frequency bioimpedance spectrometers (Xitron 4000B and SEAC SFB3) were compared by performing measurements on a set of electronic circuits and by studying 14 healthy volunteers. Output data were plotted as reactance versus resistance and fitted with a semicircle using a least squares fitting program. In tests with six electronic circuits both instruments produced impedance loci that were well described by semicircular Cole-Cole plots, though there were some minor discrepancies using the Xitron instrument at frequencies above 150 kHz. When tested on the volunteers the SEAC instrument gave very good fits (RMSE = 1.5 Ω) to a semicircle from 5-600 kHz on all volunteers. The Xitron instrument gave excellent fits to the semicircle between 5 and 55 kHz (RMSE = 0.7 Ω) but above 55 kHz the phase measurements stayed constant or even increased, confirming the anomalous behaviour reported by other authors. The conclusions to be drawn are that the semicircular plots predicted by the Cole-Cole theory give a very good description of multifrequency impedance data recorded by the SEAC SFB3 instrument, on human subjects, for frequencies between 5 and 600 kHz. The Xitron 4000B is not able to reproduce the theoretically expected results in humans above 55 kHz.</div></front></TEI><affiliations><list><country><li>Australie</li></country></list><tree><noCountry><name sortKey="Cornish, B H" sort="Cornish, B H" uniqKey="Cornish B" first="B. H." last="Cornish">B. H. Cornish</name><name sortKey="Thomas, B J" sort="Thomas, B J" uniqKey="Thomas B" first="B. J." last="Thomas">B. J. Thomas</name></noCountry><country name="Australie"><noRegion><name sortKey="Stroud, D B" sort="Stroud, D B" uniqKey="Stroud D" first="D. B." last="Stroud">D. B. Stroud</name></noRegion><name sortKey="Ward, L C" sort="Ward, L C" uniqKey="Ward L" first="L. C." last="Ward">L. C. Ward</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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