en
Scientific article
Open access
English

An improved trap design for decoupling multinuclear RF coils

Published inMagnetic resonance in medicine, vol. 72, no. 2, p. 584-590
Publication date2014
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.

Citation (ISO format)
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
Main files (1)
Article (Published version)
accessLevelPublic
Identifiers
ISSN of the journal0740-3194
571views
281downloads

Technical informations

Creation01/10/2015 6:06:00 PM
First validation01/10/2015 6:06:00 PM
Update time03/14/2023 10:39:07 PM
Status update03/14/2023 10:39:07 PM
Last indexation01/16/2024 3:46:34 PM
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack