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The Hardware System Study of the Magnetic Resonance Electrical Impedance Tomography

Author: HeYongBo
Tutor: SongTao
School: Institute of Electrical Engineering
Course: Theory and New
Keywords: Magnetic resonance electrical impedance tomography Magnetization vector Current density Magnetic flux density distribution SNR
CLC: TP274.4
Type: Master's thesis
Year: 2005
Downloads: 174
Quote: 3
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Abstract


Magnetic resonance electrical impedance tomography (Magnetic Resonance Electrical Impedance Tomography, referred MREIT) technology is a way to magnetic resonance imaging (MRI) technology and electrical impedance tomography (Electrical Impedance Tomography, EIT) technology combines a new functional imaging technology. Its biggest advantage lies in its ability to obtain high-resolution images impedance distribution , improve the conventional EIT techniques defects. The purpose of this paper is a magnetic resonance imaging technique electrical impedance signal measurement and data acquisition key technology research, on the basis of the design and development of a magnetic resonance electrical impedance tomography data acquisition system for further experimental studies and algorithms to build experimental platform . Firstly, starting from the EIT problem , systematically expounded the EIT hardware system structure and performance characteristics of each functional module and design methods , developed a complete EIT data acquisition system , the imaging experiments show the good performance of the system . On this basis , substantial departure from the principles and physical and combined MREIT existing research results, MRI techniques and EIT technology elaborate combination of points , discussed MREIT strictly match between the imaging sequence is given for the imaging of the system sequence. Combined 0.25T magnet magnetic resonance equipment , given MREIT hardware system solutions for bipolar current source characteristics, design implemented using hardware trigger circuit , and the entire system electromagnetic compatibility are discussed and design. The system of the physical model experiments , to obtain the magnetic flux density distribution image and a current density distribution image (MRCDI), verify the feasibility of the system ; RF shielding electrodes to reduce the phenomenon of different electrode configurations and materials for the discussion of the proposed system, a carbon electrode as the electrode MREIT preferred embodiment .

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