title: Whole-body radiofrequency coil for (31) P MRSI at 7 T.
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. Copyright © 2016 John Wiley & Sons, Ltd.
authors.affiliation: Department of Radiology, University Medical Center Utrecht, Utrecht, the Netherlands.
authors.forename: J
authors.initials: J
authors.lastname: Löring
authors.affiliation: Department of Radiology, University Medical Center Utrecht, Utrecht, the Netherlands.
authors.forename: W J M
authors.initials: WJ
authors.lastname: van der Kemp
authors.affiliation: MR Coils BV, Zaltbommel, the Netherlands.
authors.forename: S
authors.initials: S
authors.lastname: Almujayyaz
authors.affiliation: Department of Radiology, University Medical Center Utrecht, Utrecht, the Netherlands.
authors.forename: J W M
authors.initials: JW
authors.lastname: van Oorschot
authors.affiliation: Department of Radiology, University Medical Center Utrecht, Utrecht, the Netherlands.
authors.forename: P R
authors.initials: PR
authors.lastname: Luijten
authors.affiliation: Department of Radiology, University Medical Center Utrecht, Utrecht, the Netherlands.|MR Coils BV, Zaltbommel, the Netherlands.
authors.forename: D W J
authors.initials: DW
authors.lastname: Klomp
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000295:instrumentation*; D009682:Magnetic Resonance Spectroscopy / Q000295:instrumentation*; D008280:Magnetics / Q000295:instrumentation*; D057054:Molecular Imaging / Q000295:instrumentation*; D017553:Phosphorus Compounds / Q000378:metabolism*; D010759:Phosphorus Isotopes / Q000493:pharmacokinetics*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014159:Transducers; D051598:Whole Body Imaging / Q000295:instrumentation*
chemical_list: D017553:Phosphorus Compounds; D010759:Phosphorus Isotopes
keywords: 31P; 7 T; MRSI; RF coil