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
Magnetic resonance electrical impedance tomography based on MRI-SPAMM
Download
index.pdf
Date
2016
Author
Sümser, Kemal
Metadata
Show full item record
Item Usage Stats
260
views
206
downloads
Cite This
Electrical conductivity of biological tissues differs among different kinds of tissues. Information about measured impedance of a tissue gives great deal of information about pathological state of the tissue and some biomedical applications requires this information. Magnetic Resonance Current Density Imaging (MRCDI) and Magnetic Resonance Electrical Impedance Tomography (MREIT) are two imaging modalities which investigates current and conductivity distribution inside objects by utilizing the magnetic flux density distribution induced by externally applied currents. Spatial Modulation of Magnetization (SPAMM) is a pre-imaging pulse sequence which is used to evaluate spatially dependent properties of an imaged object. Standard MREIT pulse sequences have long repetition times and this results in long acquisition times. Long acquisition times make imaging susceptible to artefacts. This problem can be overcomed by injecting current during a pre-imaging sequence and usage of pulse sequences with low repetition times. The aim of this study is to implement a new data acquisition sequence for MRCDI and MREIT applications. Spin Echo (SE) and Gradient Echo (GE) based SPAMM pulse sequences are implemented and tested on different experimental phantoms. Magnetic flux density data are obtained using this new technique. Current density and conductivity distributions are calculated. Noise levels and minimum measurable current level with proposed sequences are measured. SPAMM based pulse sequences are found to be applicable to MRCDI and MREIT studies and can help to reduce data acquisition times.
Subject Keywords
Tomography.
,
Magnetic resonance.
,
Magnetic resonance imaging.
,
Electrical impedance tomography.
URI
http://etd.lib.metu.edu.tr/upload/12619811/index.pdf
https://hdl.handle.net/11511/25503
Collections
Graduate School of Natural and Applied Sciences, Thesis
Suggestions
OpenMETU
Core
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...
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...
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...
Dual current injection-magnetic resonance electrical impedance tomography using spatial modulation of magnetization
Naji, Nashwan; Eyüboğlu, Behçet Murat; Department of Electrical and Electronics Engineering (2016)
Electrical conductivity of biological tissues provides valuable information on physiological and pathological state of tissues. This may provide conductivity imaging a great potential to have diagnostic applications in clinical field. Developing a method that is able to recognize conductivity variations inside human body has received a great attention over the last decades. Magnetic Resonance Electrical Impedance Tomography (MREIT) is an imaging modality that utilizes current injection during magnetic reson...
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...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
K. Sümser, “Magnetic resonance electrical impedance tomography based on MRI-SPAMM,” M.S. - Master of Science, Middle East Technical University, 2016.
