Ultra-low-field MRI for the detection of liquid explosives

被引：55
|
作者：
Espy, M. [1 ]
Flynn, M. [1 ]
Gomez, J. [1 ]
Hanson, C. [1 ]
Kraus, R. [1 ]
Magnelind, P. [1 ]
Maskaly, K. [1 ]
Matlashov, A. [1 ]
Newman, S. [1 ]
Owens, T. [1 ]
Peters, M. [1 ]
Sandin, H. [1 ]
Savukov, I. [1 ]
Schultz, L. [1 ]
Urbaitis, A. [1 ]
Volegov, P. [1 ]
Zotev, V. [1 ]
机构：
[1] Los Alamos Natl Lab, Appl Modern Phys Grp, Los Alamos, NM 87545 USA
来源：
SUPERCONDUCTOR SCIENCE & TECHNOLOGY | 2010年 / 23卷 / 03期
关键词：
NUCLEAR-QUADRUPOLE RESONANCE; QUANTUM INTERFERENCE DEVICE; MICROTESLA MAGNETIC-FIELDS; NMR; SPECTROMETER; RELAXOMETRY; MEG;
D O I：
10.1088/0953-2048/23/3/034023
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Recently it has become both possible and practical to use magnetic resonance (MR) at magnetic fields in the range from mu T to mT, the so-called ultra-low-field (ULF) regime. SQUID (superconducting quantum interference device) sensor technology allows for ultra-sensitive detection while pulsed pre-polarizing fields greatly enhance the signal. The instrumentation allows for unprecedented flexibility in signal acquisition sequences and simplified MRI instrumentation. Here we present results for a new application of ULF MRI and relaxometry for the detection and characterization of liquids. We briefly describe the motivation and advantages of the ULF MR approach, and present recent results from a seven-channel ULF MRI/relaxometer system constructed to non-invasively inspect liquids at a security checkpoint for the presence of hazardous material. The instrument was deployed at the Albuquerque International Airport in December 2008, and results from that endeavor are also presented.
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页数：8
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