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NMR Biomed. 2016 Jun;29(6):709-20. doi: 10.1002/nbm.3517. Epub 2016 Apr 1.

Whole-body radiofrequency coil for (31) P MRSI at 7 T.

Author information

1
Department of Radiology, University Medical Center Utrecht, Utrecht, the Netherlands.
2
MR Coils BV, Zaltbommel, the Netherlands.

Abstract

Widespread use of ultrahigh-field (31) P MRSI in clinical studies is hindered by the limited field of view and non-uniform radiofrequency (RF) field obtained from surface transceivers. The non-uniform RF field necessitates the use of high specific absorption rate (SAR)-demanding adiabatic RF pulses, limiting the signal-to-noise ratio (SNR) per unit of time. Here, we demonstrate the feasibility of using a body-sized volume RF coil at 7 T, which enables uniform excitation and ultrafast power calibration by pick-up probes. The performance of the body coil is examined by bench tests, and phantom and in vivo measurements in a 7-T MRI scanner. The accuracy of power calibration with pick-up probes is analyzed at a clinical 3-T MR system with a close to identical (1) H body coil integrated at the MR system. Finally, we demonstrate high-quality three-dimensional (31) P MRSI of the human body at 7 T within 5 min of data acquisition that includes RF power calibration.

KEYWORDS:

31P; 7 T; MRSI; RF coil

PMID:
27037615
DOI:
10.1002/nbm.3517
[Indexed for MEDLINE]

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