Toward a magnetic resonance electrical impedance tomography in ultra-low field: A direct magnetic resonance imaging method by an external alternating current

被引：6
|
作者：
Lee, Seong-Joo [1 ]
Shim, Jeong Hyun [1 ,2 ]
Yu, Kwon Kyu [1 ]
Hwang, Seong-min [1 ,2 ]
Oh, Sangwon [1 ]
Hilschenz, Ingo [1 ]
Kim, Kiwoong [1 ,2 ]
机构：
[1] KRISS, Ultra Low Magnet Field Team, 267 Gajeong Ro, Daejeon 34113, South Korea
[2] UST, Dept Med Phys, 217 Gajeong Ro, Daejeon 34113, South Korea
来源：
APPLIED PHYSICS LETTERS | 2018年 / 112卷 / 15期
关键词：
DYNAMIC NUCLEAR-POLARIZATION; ADIABATIC PULSES; NMR; MREIT; MRI; CONDUCTIVITY;
D O I：
10.1063/1.5023540
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Measuring the electrical impedance of biological tissues in a low frequency range is challenging. Here, we have conducted a superconducting quantum interference device-based microtesla magnetic resonance (MR) imaging study. To obtain an MR image caused by an injected alternating current (ac), we utilized the direct resonance method in which the nuclear spins resonate with the ac magnetic field generated by the external ac current. This method requires an adiabatic pulse and non-adiabatic step-down pulse techniques. The experimental and simulation results agree well with each other and show the feasibility of low-frequency magnetic resonance electrical impedance tomography in the kHz range. Published by AIP Publishing.
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页数：4
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