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Verfasst von:Braun, Fabian [VerfasserIn]   i
 Grychtol, Bartłomiej [VerfasserIn]   i
Titel:Aortic blood pressure measured via EIT
Titelzusatz:investigation of different measurement settings
Verf.angabe:Fabian Braun, Martin Proença, Michael Rapin, Mathieu Lemay, Andy Adler, Bartłomiej Grychtol, Josep Solà and Jean-Philippe Thiran
E-Jahr:2015
Jahr:26 May 2015
Umfang:13 S.
Fussnoten:Gesehen am 17.12.2018
Titel Quelle:Enthalten in: Physiological measurement
Ort Quelle:Bristol : IOP Publ., 1993
Jahr Quelle:2015
Band/Heft Quelle:36(2015), 6, Seite 1147-1159
ISSN Quelle:1361-6579
Abstract:Electrical impedance tomography (EIT) allows the measurement of intra-thoracic impedance changes related to cardiovascular activity. As a safe and low-cost imaging modality, EIT is an appealing candidate for non-invasive and continuous haemodynamic monitoring. EIT has recently been shown to allow the assessment of aortic blood pressure via the estimation of the aortic pulse arrival time (PAT). However, finding the aortic signal within EIT image sequences is a challenging task: the signal has a small amplitude and is difficult to locate due to the small size of the aorta and the inherent low spatial resolution of EIT. In order to most reliably detect the aortic signal, our objective was to understand the effect of EIT measurement settings (electrode belt placement, reconstruction algorithm). This paper investigates the influence of three transversal belt placements and two commonly-used difference reconstruction algorithms (Gauss-Newton and GREIT) on the measurement of aortic signals in view of aortic blood pressure estimation via EIT. A magnetic resonance imaging based three-dimensional finite element model of the haemodynamic bio-impedance properties of the human thorax was created. Two simulation experiments were performed with the aim to (1) evaluate the timing error in aortic PAT estimation and (2) quantify the strength of the aortic signal in each pixel of the EIT image sequences. Both experiments reveal better performance for images reconstructed with Gauss-Newton (with a noise figure of 0.5 or above) and a belt placement at the height of the heart or higher. According to the noise-free scenarios simulated, the uncertainty in the analysis of the aortic EIT signal is expected to induce blood pressure errors of at least ± 1.4 mmHg.
DOI:doi:10.1088/0967-3334/36/6/1147
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext: http://dx.doi.org/10.1088/0967-3334/36/6/1147
 Volltext: http://stacks.iop.org/0967-3334/36/i=6/a=1147
 DOI: https://doi.org/10.1088/0967-3334/36/6/1147
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1585603740
Verknüpfungen:→ Zeitschrift

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