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Radiofrequency configuration to facilitate bilateral breast 31 P MR spectroscopic imaging and high‐resolution MRI at 7 Tesla
Author(s) -
van der Velden Tijl A.,
Italiaander Michel,
van der Kemp Wybe J.M.,
Raaijmakers Alexander J.E.,
Schmitz A.M. Th.,
Luijten Peter R.,
Boer Vincent O.,
Klomp Dennis W.J.
Publication year - 2015
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.25573
Subject(s) - nuclear magnetic resonance , physics , magnetic resonance imaging , nuclear medicine , materials science , medicine , radiology
Purpose High‐resolution MRI combined with phospholipid detection may improve breast cancer grading. Currently, configurations are optimized for either high‐resolution imaging or 31 P spectroscopy. To be able to perform both imaging as well as spectroscopy in a single session, we integrated a 1 H receiver array into a 1 H‐ 31 P transceiver at 7T. To ensure negligible signal loss due to coupling between elements, we investigated the use of a floating decoupling loop to enable bilateral MRI and 31 P MRS. Methods Two quadrature double‐tuned radiofrequency coils were designed for bilateral breast MR with active detuning at the 1 H frequency. The two coils were placed adjacent to each other and decoupled for both frequencies with a single resonant floating loop. Sensitivity of the bilateral configuration, facilitating space for a 26‐element 1 H receive array, was compared with a transceiver configuration. Results The floating loop was able to decouple the elements over 20 dB for both frequencies. Enlargement of the elements, to provide space for the receivers, and the addition of detuning electronics altered the 31 P sensitivity by 0.4 dB. Conclusion Dynamic contrast‐enhanced scans of 0.7 mm isotropic, diffusion‐weighted imaging, and 31 P MR spectroscopic imaging can be acquired at 7T in a single session as demonstrated in a patient with invasive ductal carcinoma. Magn Reson Med 74:1803–1810, 2015. © 2014 Wiley Periodicals, Inc.