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Tomography is published by MDPI from Volume 7 Issue 1 (2021). Previous articles were published by another publisher in Open Access under a CC-BY (or CC-BY-NC-ND) licence, and they are hosted by MDPI on mdpi.com as a courtesy and upon agreement with Grapho, LLC.
Article

Low-Noise Active Decoupling Circuit and its Application to 13C Cryogenic RF Coils at 3 T

1
Department of Electrical Engineering, Technical University of Denmark, Kongens Lyngby, Copenhagen, Denmark
2
MR Research Centre, Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
*
Author to whom correspondence should be addressed.
Tomography 2017, 3(1), 60-66; https://doi.org/10.18383/j.tom.2016.00280
Received: 2 December 2016 / Revised: 7 January 2017 / Accepted: 9 February 2017 / Published: 1 March 2017
We analyze the loss contributions in a small, 50-mm-diameter receive-only coil for carbon-13 (13C) magnetic resonance imaging at 3 T for 3 different circuits, which, including active decoupling, are compared in terms of their Q-factors and signal-to-noise ratio (SNR). The results show that a circuit using unsegmented tuning and split matching capacitors can provide >20% SNR enhancement at room temperature compared with that using more traditional designs. The performance of the proposed circuit was also measured when cryogenically cooled to 105 K, and an additional 1.6-fold SNR enhancement was achieved on a phantom. The enhanced circuit performance is based on the low capacitance needed to match to 50 Ω when coil losses are low, which significantly reduces the proportion of the current flowing through the matching network and therefore minimizes this loss contribution. This effect makes this circuit particularly suitable for receive-only cryogenic coils and/or small coils for low-gamma nuclei.
Keywords: RF coil; SNR; cryogenic; 13C MRI RF coil; SNR; cryogenic; 13C MRI
MDPI and ACS Style

Sanchez-Heredia, J.D.; Hansen, E.S.S.; Laustsen, C.; Zhurbenko, V.; Ardenkjær-Larsen, J.H. Low-Noise Active Decoupling Circuit and its Application to 13C Cryogenic RF Coils at 3 T. Tomography 2017, 3, 60-66. https://doi.org/10.18383/j.tom.2016.00280

AMA Style

Sanchez-Heredia JD, Hansen ESS, Laustsen C, Zhurbenko V, Ardenkjær-Larsen JH. Low-Noise Active Decoupling Circuit and its Application to 13C Cryogenic RF Coils at 3 T. Tomography. 2017; 3(1):60-66. https://doi.org/10.18383/j.tom.2016.00280

Chicago/Turabian Style

Sanchez-Heredia, Juan Diego, Esben Søvsø Szocska Hansen, Christoffer Laustsen, Vitaliy Zhurbenko, and Jan Henrik Ardenkjær-Larsen. 2017. "Low-Noise Active Decoupling Circuit and its Application to 13C Cryogenic RF Coils at 3 T" Tomography 3, no. 1: 60-66. https://doi.org/10.18383/j.tom.2016.00280

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