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Experimental investigation of RF magnetic field homogeneity in a bridged loop‐gap resonator
Author(s) -
Ono Mitsuhiro,
Suenaga Akihiko,
Hirata Hiroshi
Publication year - 2002
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.10030
Subject(s) - homogeneity (statistics) , magnetic field , electromagnetic shielding , resonator , nuclear magnetic resonance , electric field , radio frequency , magnetostatics , magnetic reactance , materials science , condensed matter physics , electrical conductor , physics , optics , magnetization , magnetic energy , electrical engineering , engineering , statistics , mathematics , quantum mechanics , composite material
The relationship between an RF magnetic field and an electric shielding plate called a bridge in a bridged loop‐gap resonator (BLGR), which is used for EPR spectroscopy and imaging, is examined. The magnetic field in a BLGR is perturbed due to discontinuity of the conductive loop and electric fringing fields near the gaps. The magnetic field homogeneity in the BLGR can be improved with a bridge. The optimum angle for such bridges can be found by measuring the RF magnetic field. In this study, the RF magnetic field was measured for BLGRs 70 mm in diameter, with a resonance frequency of 302 ± 5 MHz. The field uniformity on a circle with a radius of 27 mm was improved by 8% with bridges at optimal angles. Improved RF magnetic field homogeneity associated with a BLGR is demonstrated. Magn Reson Med 47:415–419, 2002. © 2002 Wiley‐Liss, Inc.