Radiofrequency Configuration to Facilitate Bilateral Breast 31P MR Spectroscopic Imaging and High-Resolution MRI at 7 Tesla

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Abstract

Purpose:

High-resolution MRI combined with phospholipid detection may improve breast cancer grading. Currently, configurations are optimized for either high-resolution imaging or 31P spectroscopy. To be able to perform both imaging as well as spectroscopy in a single session, we integrated a 1H receiver array into a 1H-31P 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 31P MRS.

Methods:

Two quadrature double-tuned radiofrequency coils were designed for bilateral breast MR with active detuning at the 1H 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 1H 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 31P sensitivity by 0.4 dB.

Conclusion:

Dynamic contrast-enhanced scans of 0.7 mm isotropic, diffusion-weighted imaging, and 31P 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.

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