Validation of cardiac accelerometer sensor measurements
Identifieur interne : 004354 ( Main/Exploration ); précédent : 004353; suivant : 004355Validation of cardiac accelerometer sensor measurements
Auteurs : Espen W. Remme [Norvège] ; Lars Hoff [Norvège] ; Per Steinar Halvorsen [Norvège] ; Edvard Nrum [Norvège] ; Helge Skulstad [Norvège] ; Lars A. Fleischer [Norvège] ; Ole Jakob Elle [Norvège] ; Erik Fosse [Norvège]Source :
- Physiological Measurement [ 0967-3334 ] ; 2009.
Abstract
In this study we have investigated the accuracy of an accelerometer sensor designed for the measurement of cardiac motion and automatic detection of motion abnormalities caused by myocardial ischaemia. The accelerometer, attached to the left ventricular wall, changed its orientation relative to the direction of gravity during the cardiac cycle. This caused a varying gravity component in the measured acceleration signal that introduced an error in the calculation of myocardial motion. Circumferential displacement, velocity and rotation of the left ventricular apical region were calculated from the measured acceleration signal. We developed a mathematical method to separate translational and gravitational acceleration components based on a priori assumptions of myocardial motion. The accuracy of the measured motion was investigated by comparison with known motion of a robot arm programmed to move like the heart wall. The accuracy was also investigated in an animal study. The sensor measurements were compared with simultaneously recorded motion from a robot arm attached next to the sensor on the heart and with measured motion by echocardiography and a video camera. The developed compensation method for the varying gravity component improved the accuracy of the calculated velocity and displacement traces, giving very good agreement with the reference methods.
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DOI: 10.1088/0967-3334/30/12/010
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Remme</name><affiliation wicri:level="1"><country xml:lang="fr">Norvège</country><wicri:regionArea>The Interventional Centre, Oslo University Hospital, Rikshospitalet, Oslo</wicri:regionArea><wicri:noRegion>Oslo</wicri:noRegion></affiliation><affiliation wicri:level="1"><country wicri:rule="url">Norvège</country></affiliation></author><author><name sortKey="Hoff, Lars" sort="Hoff, Lars" uniqKey="Hoff L" first="Lars" last="Hoff">Lars Hoff</name><affiliation wicri:level="1"><country xml:lang="fr">Norvège</country><wicri:regionArea>Vestfold University College, Tnsberg</wicri:regionArea><wicri:noRegion>Tnsberg</wicri:noRegion></affiliation></author><author><name sortKey="Halvorsen, Per Steinar" sort="Halvorsen, Per Steinar" uniqKey="Halvorsen P" first="Per Steinar" last="Halvorsen">Per Steinar Halvorsen</name><affiliation wicri:level="1"><country xml:lang="fr">Norvège</country><wicri:regionArea>The Interventional Centre, Oslo University Hospital, Rikshospitalet, Oslo</wicri:regionArea><wicri:noRegion>Oslo</wicri:noRegion></affiliation></author><author><name sortKey="Nrum, Edvard" sort="Nrum, Edvard" uniqKey="Nrum E" first="Edvard" last="Nrum">Edvard Nrum</name><affiliation wicri:level="1"><country xml:lang="fr">Norvège</country><wicri:regionArea>The Interventional Centre, Oslo University Hospital, Rikshospitalet, Oslo</wicri:regionArea><wicri:noRegion>Oslo</wicri:noRegion></affiliation></author><author><name sortKey="Skulstad, Helge" sort="Skulstad, Helge" uniqKey="Skulstad H" first="Helge" last="Skulstad">Helge Skulstad</name><affiliation wicri:level="1"><country xml:lang="fr">Norvège</country><wicri:regionArea>Department of Cardiology, Oslo University Hospital, Rikshospitalet, Oslo</wicri:regionArea><wicri:noRegion>Oslo</wicri:noRegion></affiliation></author><author><name sortKey="Fleischer, Lars A" sort="Fleischer, Lars A" uniqKey="Fleischer L" first="Lars A" last="Fleischer">Lars A. Fleischer</name><affiliation wicri:level="1"><country xml:lang="fr">Norvège</country><wicri:regionArea>Vestfold University College, Tnsberg</wicri:regionArea><wicri:noRegion>Tnsberg</wicri:noRegion></affiliation></author><author><name sortKey="Elle, Ole Jakob" sort="Elle, Ole Jakob" uniqKey="Elle O" first="Ole Jakob" last="Elle">Ole Jakob Elle</name><affiliation wicri:level="1"><country xml:lang="fr">Norvège</country><wicri:regionArea>The Interventional Centre, Oslo University Hospital, Rikshospitalet, Oslo</wicri:regionArea><wicri:noRegion>Oslo</wicri:noRegion></affiliation></author><author><name sortKey="Fosse, Erik" sort="Fosse, Erik" uniqKey="Fosse E" first="Erik" last="Fosse">Erik Fosse</name><affiliation wicri:level="1"><country xml:lang="fr">Norvège</country><wicri:regionArea>The Interventional Centre, Oslo University Hospital, Rikshospitalet, Oslo</wicri:regionArea><wicri:noRegion>Oslo</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">Physiological Measurement</title><title level="j" type="abbrev">Physiol. Meas.</title><idno type="ISSN">0967-3334</idno><idno type="eISSN">1361-6579</idno><imprint><publisher>IOP Publishing</publisher><date type="published" when="2009">2009</date><biblScope unit="volume">30</biblScope><biblScope unit="issue">12</biblScope><biblScope unit="page" from="1429">1429</biblScope><biblScope unit="page" to="1444">1444</biblScope><biblScope unit="production">Printed in the UK</biblScope></imprint><idno type="ISSN">0967-3334</idno></series><idno type="istex">755203A072AAC6BCE0B34D3AA0E716CB90B6CBE8</idno><idno type="DOI">10.1088/0967-3334/30/12/010</idno><idno type="PII">S0967-3334(09)21426-2</idno><idno type="articleID">321426</idno><idno type="articleNumber">010</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0967-3334</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">In this study we have investigated the accuracy of an accelerometer sensor designed for the measurement of cardiac motion and automatic detection of motion abnormalities caused by myocardial ischaemia. The accelerometer, attached to the left ventricular wall, changed its orientation relative to the direction of gravity during the cardiac cycle. This caused a varying gravity component in the measured acceleration signal that introduced an error in the calculation of myocardial motion. Circumferential displacement, velocity and rotation of the left ventricular apical region were calculated from the measured acceleration signal. We developed a mathematical method to separate translational and gravitational acceleration components based on a priori assumptions of myocardial motion. The accuracy of the measured motion was investigated by comparison with known motion of a robot arm programmed to move like the heart wall. The accuracy was also investigated in an animal study. The sensor measurements were compared with simultaneously recorded motion from a robot arm attached next to the sensor on the heart and with measured motion by echocardiography and a video camera. The developed compensation method for the varying gravity component improved the accuracy of the calculated velocity and displacement traces, giving very good agreement with the reference methods.</div></front></TEI><affiliations><list><country><li>Norvège</li></country></list><tree><country name="Norvège"><noRegion><name sortKey="Remme, Espen W" sort="Remme, Espen W" uniqKey="Remme E" first="Espen W" last="Remme">Espen W. Remme</name></noRegion><name sortKey="Elle, Ole Jakob" sort="Elle, Ole Jakob" uniqKey="Elle O" first="Ole Jakob" last="Elle">Ole Jakob Elle</name><name sortKey="Fleischer, Lars A" sort="Fleischer, Lars A" uniqKey="Fleischer L" first="Lars A" last="Fleischer">Lars A. Fleischer</name><name sortKey="Fosse, Erik" sort="Fosse, Erik" uniqKey="Fosse E" first="Erik" last="Fosse">Erik Fosse</name><name sortKey="Halvorsen, Per Steinar" sort="Halvorsen, Per Steinar" uniqKey="Halvorsen P" first="Per Steinar" last="Halvorsen">Per Steinar Halvorsen</name><name sortKey="Hoff, Lars" sort="Hoff, Lars" uniqKey="Hoff L" first="Lars" last="Hoff">Lars Hoff</name><name sortKey="Nrum, Edvard" sort="Nrum, Edvard" uniqKey="Nrum E" first="Edvard" last="Nrum">Edvard Nrum</name><name sortKey="Remme, Espen W" sort="Remme, Espen W" uniqKey="Remme E" first="Espen W" last="Remme">Espen W. Remme</name><name sortKey="Skulstad, Helge" sort="Skulstad, Helge" uniqKey="Skulstad H" first="Helge" last="Skulstad">Helge Skulstad</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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