Lorentz force electrical impedance tomography using magnetic field measurements

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dc.contributor.authorZengin, Reyhan
dc.contributor.authorGencer, Nevzat Guneri
dc.date.accessioned2020-03-26T19:24:57Z
dc.date.available2020-03-26T19:24:57Z
dc.date.issued2016
dc.departmentSelçuk Üniversitesien_US
dc.description.abstractIn this study, magnetic field measurement technique is investigated to image the electrical conductivity properties of biological tissues using Lorentz forces. This technique is based on electrical current induction using ultrasound together with an applied static magnetic field. The magnetic field intensity generated due to induced currents is measured using two coil configurations, namely, a rectangular loop coil and a novel xy coil pair. A time-varying voltage is picked-up and recorded while the acoustic wave propagates along its path. The forward problem of this imaging modality is defined as calculation of the pick-up voltages due to a given acoustic excitation and known body properties. Firstly, the feasibility of the proposed technique is investigated analytically. The basic field equations governing the behaviour of time-varying electromagnetic fields are presented. Secondly, the general formulation of the partial differential equations for the scalar and magnetic vector potentials are derived. To investigate the feasibility of this technique, numerical studies are conducted using a finite element method based software. To sense the pick-up voltages a novel coil configuration (xy coil pairs) is proposed. Two-dimensional numerical geometry with a 16-element linear phased array (LPA) ultrasonic transducer (1 MHz) and a conductive body (breast fat) with five tumorous tissues is modeled. The static magnetic field is assumed to be 4 Tesla. To understand the performance of the imaging system, the sensitivity matrix is analyzed. The sensitivity matrix is obtained for two different locations of LPA transducer with eleven steering angles from -25 degrees to 25 degrees at intervals of 5 degrees. The characteristics of the imaging system are shown with the singular value decomposition (SVD) of the sensitivity matrix. The images are reconstructed with the truncated SVD algorithm. The signal-to-noise ratio in measurements is assumed 80 dB. Simulation studies based on the sensitivity matrix analysis reveal that perturbations with 5 mm x 5 mm size can be detected up to a 3.5 cm depth.en_US
dc.description.sponsorshipMinistry of Development within the context of Faculty Development Programme (FDP); Selcuk UniversitySelcuk Universityen_US
dc.description.sponsorshipThis work was financially supported by the Ministry of Development within the context of Faculty Development Programme (FDP). FDP was coordinated by the Middle East Technical University in partnership with Selcuk University. We would like to thank to Mursel Karadas for his valuable criticism on the theoretical work and numerical simulations. We are also grateful to Serdar Kiykioglu for his critical reading of the manuscript.en_US
dc.identifier.doi10.1088/0031-9155/61/16/5887en_US
dc.identifier.endpage5905en_US
dc.identifier.issn0031-9155en_US
dc.identifier.issn1361-6560en_US
dc.identifier.issue16en_US
dc.identifier.pmid27436483en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.startpage5887en_US
dc.identifier.urihttps://dx.doi.org/10.1088/0031-9155/61/16/5887
dc.identifier.urihttps://hdl.handle.net/20.500.12395/33758
dc.identifier.volume61en_US
dc.identifier.wosWOS:000384208600006en_US
dc.identifier.wosqualityQ2en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.indekslendigikaynakPubMeden_US
dc.language.isoenen_US
dc.publisherIOP PUBLISHING LTDen_US
dc.relation.ispartofPHYSICS IN MEDICINE AND BIOLOGYen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.selcuk20240510_oaigen_US
dc.subjectelectrical conductivity imagingen_US
dc.subjectelectrical impedance tomographyen_US
dc.subjectmagneto-acousto-electrical tomographyen_US
dc.subjectHall effect imagingen_US
dc.subjectultrasounden_US
dc.titleLorentz force electrical impedance tomography using magnetic field measurementsen_US
dc.typeArticleen_US

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