Journal Article

FZJ-2019-01795

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Design of a Quadrature 1H/31P Coil Using Bent Dipole Antenna and Four-Channel Loop at 3T MRI

Hong, S.-M. (Corresponding author) ; Choi, C.-H.FZJ* ; Magill, A. W. ; Jon Shah, N. ; Felder, J.FZJ*

2018
IEEE New York, NY

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Please use a persistent id in citations: doi:10.1109/TMI.2018.2844462

Abstract: MRI using nuclei other than protons is of clinical interest due to the important role of these nuclei in cellular processes. Phosphorous-31 ( 31 P), for example, plays an important role in energy metabolism. However, measurement of 31 P can be challenging, as the receive signal is weak compared with that of proton ( 1 H). Consequently, it is often necessary to integrate 1 H elements for localizations and B0 shimming in RF coils intended for 31 P measurements. Good decoupling between the 1 H and the 31 P elements is therefore essential. In this paper, bent dipole antennas tuned to 1 H were integrated with a four channel 31 P loop coil array, in a manner providing strong geometric decoupling between dipoles and loops. As the physical length of a resonant dipole antenna is too long at 3T, the dipole antennas were bent around the load. The loss of 31 P elements due to the presence of the dipole antennas was evaluated by measuring scattering parameters and comparing the SNR of 31 P spectra with and without the presence of the dipole antennas. The performance of the bent dipole antenna was evaluated by simulation and sensitivity measurement. The Q-factors and the SNR of the four-loop array were reduced by less than 5% when the bent dipole antennas were introduced. The measured sensitivity of the bent dipole was higher (15%) than that of dual-tuned birdcage. The combined bent dipole and loop array is therefore a promising design for 1 H/ 31 P applications at 3T.

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Contributing Institute(s):

1. Physik der Medizinischen Bildgebung (INM-4)
2. Jara-Institut Quantum Information (INM-11)
3. JARA-BRAIN (JARA-BRAIN)

Research Program(s):

1. 573 - Neuroimaging (POF3-573) (POF3-573)

Appears in the scientific report 2019

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Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Clinical Medicine ; Current Contents - Engineering, Computing and Technology ; Ebsco Academic Search ; IF >= 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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