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The crossover surface coil: an efficient in vivo nmr detector
Author(s) -
Nagel Timothy L.,
Stolk Jacob A.,
Alderman Donald W.,
Schoenborn Robin,
Schweizer Martin P.
Publication year - 1990
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.1910130209
Subject(s) - electromagnetic coil , crossover , electromagnetic shielding , foil method , transposition (logic) , groove (engineering) , coil tap , materials science , copper , nuclear magnetic resonance , detector , acoustics , physics , optics , electrical engineering , computer science , composite material , geometry , engineering , mathematics , rogowski coil , artificial intelligence , metallurgy
The crossover surface coil is constructed with two turns of copper foil using a unique transposition construction which incorporates an explicit center tap ground of the widened bottom layer. The coil reduces dielectric and inductive losses by effective shielding of electric fields and uniform distribution of magnetic fields for minimum Q losses upon loading of the coil. Flexible, copper foil construction permits easy conformation to tissues of interest, enhancing coil performance. Construction details of the crossover coil and Q data for coils of various sizes operating at a number of frequencies are given.