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An improved trap design for decoupling multinuclear RF coils

Meyerspeer, Martin
Roig, Eulalia Serés
Magill, Arthur W.
Published in Magnetic Resonance in Medicine. 2014, vol. 72, no. 2, p. 584-590
Abstract PURPOSE: Multinuclear magnetic resonance spectroscopy and imaging require a radiofrequency probe capable of transmitting and receiving at the proton and non-proton frequencies. To minimize coupling between probe elements tuned to different frequencies, LC (inductor-capacitor) traps blocking current at the 1 H frequency can be inserted in non-proton elements. This work compares LC traps with LCC traps, a modified design incorporating an additional capacitor, enabling control of the trap reactance at the low frequency while maintaining 1 H blocking. METHODS: Losses introduced by both types of trap were analysed using circuit models. Radiofrequency coils incorporating a series of LC and LCC traps were then built and evaluated at the bench. LCC trap performance was then confirmed using 1 H and 13 C measurements in a 7T human scanner. RESULTS: LC and LCC traps both effectively block interaction between non-proton and proton coils at the proton frequency. LCC traps were found to introduce a sensitivity reduction of 5+/-2%, which was less than half of that caused by LC traps. CONCLUSION: Sensitivity of non-proton coils is critical. The improved trap design, incorporating one extra capacitor, significantly reduces losses introduced by the trap in the non-proton coil.
PMID: 24006123
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MEYERSPEER, Martin et al. An improved trap design for decoupling multinuclear RF coils. In: Magnetic Resonance in Medicine, 2014, vol. 72, n° 2, p. 584-590. doi: 10.1002/mrm.24931 https://archive-ouverte.unige.ch/unige:45000

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Deposited on : 2015-01-12

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