Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Data acquisition system for MAET with magnetic field measurements
Date
2019-06-01
Author
Kaboutari, Keivan
Tetik, Ahmet Onder
Ghalichi, Elyar
Gozu, Mehmet Soner
Zengin, Reyhan
Gençer, Nevzat Güneri
Metadata
Show full item record
This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
.
Item Usage Stats
252
views
0
downloads
Cite This
Magneto-acousto-electrical tomography (MAET) is an imaging modality to image the electrical conductivity of biological tissues. It is based on electrical current induction by using ultrasound under a static magnetic field. The aim of this study is to develop a data acquisition system for MAET based on magnetic field measurements. The static magnetic field is generated by six permanent neodymium magnets. A 16-element linear phased array (LPA) transducer is utilized to generate acoustic pressure waves inside the phantom. To measure the magnetic field intensity generated by the induced currents, contactless receiver sensors are developed using two similar disk multiple layer coils, which are Helmholtz coil sensor. Physical properties and electrical characteristics of the sensors are assessed. A two-stage cascaded amplifier is designed and utilized in the receiving system. The gain of the cascaded amplifier at 1 MHz is adjusted to be 96 dB. Experimental studies are conducted with two different phantoms, having 3 S m(-1) and 58 S m(-1) electrical conductivity, respectively. A-scan and B-scan images of phantoms are obtained with the LPA transducer. Comparison of the ultrasound (A-scan) and MAET signals reveals that 3 S m(-1) conductive inhomogeneity can be detected with this data acquisition system. Furthermore, the front and rear interfaces of an inhomogeneity (15.15 mm x 30 mm x 20 mm) of 58 S m(-1) conductivity are detectable.
Subject Keywords
Magneto-acousto-electrical tomography
,
Ultrasound transducer
,
Electrical impedance tomography
,
Lorentz force electrical impedance tomography
URI
https://hdl.handle.net/11511/36164
Journal
PHYSICS IN MEDICINE AND BIOLOGY
DOI
https://doi.org/10.1088/1361-6560/ab1809
Collections
Department of Electrical and Electronics Engineering, Article
Suggestions
OpenMETU
Core
Data acquisition system for Lorentz force electrical impedance tomography using magnetic field measurements
Kaboutari, Keivan; Gençer, Nevzat Güneri; Department of Electrical and Electronics Engineering (2017)
Lorentz Force Electrical Impedance Tomography (LFEIT) is a novel imaging modality to image electrical conductivity properties of biological tissues. This modality is recently proposed for early stage diagnosis of cancerous tissues. The main aim of this thesis study is to develop a data acquisition system for LFEIT. Design of contactless receiver sensor, static magnetic field generation (0.56 T is generated by permanent neodymium magnets), amplification of received signals and experimental studies using vari...
Development of reconstruction algorithms for magnetic resonance-electrical impedance tomography and experimental realization
Birgül, Özlem; Eyüboğlu, Behçet Murat; İder, Y. Ziya; Department of Electrical and Electronics Engineering (2002)
The electrical properties of biological tissues differ among tissues and vary with physiological and pathological state of a solution of bioelectrical field problems. The aim of this study is to reconstruct conductivity images with higher resolution and better accuracy than existing conductivity imaging tech niques. In order to achieve our goal, we proposed a technique named as Mag netic Resonance-Electrical Impedance Tomography (MR-EIT). MR-EIT com bines peripheral voltage measurements of classical Electri...
High resolution imaging of anisotropic conductivity with magnetic resonance electrical impedance tomography (mr-eit)
Değirmenci, Evren; Eyüboğlu, Behçet Murat; Department of Electrical and Electronics Engineering (2010)
Electrical conductivity of biological tissues is a distinctive property which differs among tissues. It also varies according to the physiological and pathological state of tissues. Furthermore, in order to solve the bioelectric field problems accurately, electrical conductivity information is essential. Magnetic Resonance Electrical Impedance Tomography (MREIT) technique is proposed to image this information with high spatial resolution. However, almost all MREIT algorithms proposed to date assumes isotrop...
Magnetic resonance conductivity tensor imaging (MRCTİ) at 3 tesla
Sadighi, Mehdi; Eyüboğlu, Behçet Murat; Department of Electrical and Electronics Engineering (2014)
Electrical conductivity of biological tissues changes with physiological and pathological state of tissue. Therefore, recognizing the changes of the conductivity distribution inside human body, provides unique information about the pathological conditions of internal organs which is not available from other imaging modalities. Magnetic Resonance Electrical Impedance Tomography (MREIT) is an imaging technique to reconstruct the isotropic conductivity distribution of the biological tissues. But most of the bi...
Design and Assembly of a Static Magnetic Field Generator for Lorentz Field Electrical Impedance Tomography
Tetik, Ahmet Onder; Ghalichi, Elyar; Kaboutari, Keivan; Gençer, Nevzat Güneri (2016-01-01)
In Lorentz Field Electrical Impedance Tomography (LFEIT), ultrasound waves are transmitted to a tissue under static magnetic field. Magnetic fields of currents generated in boundaries where conductivity difference exists because of vibrations are measured with coils. In this study, a static magnetic field is created with permanent magnets and magnetic core for LFEIT. The contribution of magnetic core to the created magnetic flux density is demonstrated. Based on these simulation studies magnetic core is des...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
K. Kaboutari, A. O. Tetik, E. Ghalichi, M. S. Gozu, R. Zengin, and N. G. Gençer, “Data acquisition system for MAET with magnetic field measurements,”
PHYSICS IN MEDICINE AND BIOLOGY
, pp. 0–0, 2019, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/36164.