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The design and construction of a dedicated RF coil setup for human brain imaging ((1)H) and spectroscopy ((31)P) at ultra-high magnetic field strength (7 T) is presented. The setup is optimized for signal handling at the resonance frequencies for (1)H (297.2 MHz) and (31)P (120.3 MHz). It consists of an eight-channel (1)H transmit-receive head coil with multi-transmit capabilities, and an insertable, actively detunable (31)P birdcage (transmit-receive and transmit only), which can be combined with a seven-channel receive-only (31)P array. The setup enables anatomical imaging and (31)P studies without removal of the coil or the patient. By separating transmit and receive channels and by optimized addition of array signals with whitened singular value decomposition we can obtain a sevenfold increase in SNR of (31)P signals in the occipital lobe of the human brain compared with the birdcage alone. These signals can be further enhanced by 30 ± 9% using the nuclear Overhauser effect by B1-shimmed low-power irradiation of water protons. Together, these features enable acquisition of (31)P MRSI at high spatial resolutions (3.0 cm(3)  voxel) in the occipital lobe of the human brain in clinically acceptable scan times (~15 min).

Original publication

DOI

10.1002/nbm.3422

Type

Journal article

Journal

NMR Biomed

Publication Date

11/2015

Volume

28

Pages

1570 - 1578

Keywords

31P-MRS, 31P-MRSI, 7 T, B1 shimming, RF coil, WSVD, array coil, multi-transmit, spectroscopic imaging, ultra-high field, Adult, Equipment Design, Equipment Failure Analysis, Humans, Image Enhancement, Magnetic Resonance Imaging, Magnetics, Male, Molecular Imaging, Occipital Lobe, Phosphorus, Phosphorus Compounds, Proton Magnetic Resonance Spectroscopy, Radio Waves, Reproducibility of Results, Sensitivity and Specificity, Tissue Distribution, Transducers