An improved trap design for decoupling multinuclear RF coils

Meyerspeer, Martin; Roig, Eulalia Serés; Gruetter, Rolf; Magill, Arthur W.

doi:10.1002/mrm.24931

Scientific article

English

An improved trap design for decoupling multinuclear RF coils

Contributors

Meyerspeer, Martin; Roig, Eulalia Serés; Gruetter, Rolf; Magill, Arthur W.

Published in

Magnetic resonance in medicine, vol. 72, no. 2, p. 584-590

Publication date

2014

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.

UNIGE affiliation entities

Faculté de médecine / Section de médecine clinique / Département de radiologie et informatique médicale

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

Article (Published version)

Identifiers

PID : unige:45000
DOI : 10.1002/mrm.24931
PMID : 24006123

Journal ISSN

0740-3194

674views

683downloads

Creation

10/01/2015 18:06:00

First validation

10/01/2015 18:06:00

Update

14/03/2023 22:39:07

Status update

14/03/2023 22:39:07

Last indexation

30/10/2024 22:07:42

An improved trap design for decoupling multinuclear RF coils

Contributors

Published in

Publication date

Abstract

UNIGE affiliation entities

Citation (ISO format)

Main files (1)

Identifiers

Journal ISSN

Technical informations

Creation

First validation

Update

Status update

Last indexation