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A practical double‐tuned 1 H/ 31 P quadrature birdcage headcoil optimized for 31 P operation
Author(s) -
Matson Gerald B.,
Vermathen Peter,
Hill Tony C.
Publication year - 1999
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/(sici)1522-2594(199907)42:1<173::aid-mrm23>3.0.co;2-o
Subject(s) - electromagnetic coil , homogeneity (statistics) , nuclear magnetic resonance , excitation , radiofrequency coil , physics , materials science , proton therapy , acoustics , computer science , proton , nuclear physics , quantum mechanics , machine learning
Abstract A double‐tuned 1 H/ 31 P birdcage head coil for use with humans at 1.5 T is described. The coil was designed for proton‐decoupled 31 P excitation and reception and incorporated a number of practical features including optimized sensitivity for 31 P, quadrature operation at 1 H and 31 P frequencies, and a radiofrequency (RF) mirror for improved B 1 homogeneity. The design achieved similar B 1 homogeneity at both 31 P and 1 H frequencies. Inductive matching was used to accommodate samples with large loading differences. A facile method for tuning and matching over a variety of sample loadings is presented, along with capacitively shortened bazookas for suppression of cable braid currents. The proton sensitivity, although down by approximately a factor of two compared with an optimized 1 H birdcage head coil, was still ample for shimming and generation of scout images. Advantages of the design are discussed and proton‐decoupled 31 P spectra of human brain are presented. Magn Reson Med 42:173–182, 1999. © 1999 Wiley‐Liss, Inc.