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Volumetric wireless coil based on periodically coupled split‐loop resonators for clinical wrist imaging
Author(s) -
Shchelokova Alena V.,
van den Berg Cornelis A.T.,
Dobrykh Dmitry A.,
Glybovski Stanislav B.,
Zubkov Mikhail A.,
Brui Ekaterina A.,
Dmitriev Dmitry S.,
Kozachenko Alexander V.,
Efimtcev Alexander Y.,
Sokolov Andrey V.,
Fokin Vladimir A.,
Melchakova Irina V.,
Belov Pavel A.
Publication year - 2018
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.27140
Subject(s) - electromagnetic coil , imaging phantom , specific absorption rate , resonator , radiofrequency coil , acoustics , biomedical engineering , image quality , magnetic resonance imaging , materials science , nuclear magnetic resonance , computer science , physics , electrical engineering , optics , engineering , telecommunications , antenna (radio) , radiology , medicine , artificial intelligence , image (mathematics)
Purpose Design and characterization of a new inductively driven wireless coil (WLC) for wrist imaging at 1.5 T with high homogeneity operating due to focusing the B 1 field of a birdcage body coil. Methods The WLC design has been proposed based on a volumetric self‐resonant periodic structure of inductively coupled split‐loop resonators with structural capacitance. The WLC was optimized and studied regarding radiofrequency fields and interaction to the birdcage coil (BC) by electromagnetic simulations. The manufactured WLC was characterized by on‐bench measurements and in vivo and phantom study in comparison to a standard cable‐connected receive‐only coil. Results The WLC placed into BC gave the measuredB 1+increase of the latter by 8.6 times for the same accepted power. The phantom and in vivo wrist imaging showed that the BC in receiving with the WLC inside reached equal or higher signal‐to‐noise ratio than the conventional clinical setup comprising the transmit‐only BC and a commercial receive‐only flex‐coil and created no artifacts. Simulations and on‐bench measurements proved safety in terms of specific absorption rate and reflected transmit power. Conclusions The results showed that the proposed WLC could be an alternative to standard cable‐connected receive coils in clinical magnetic resonance imaging. As an example, with no cable connection, the WLC allowed wrist imaging on a 1.5 T clinical machine using a full‐body BC for transmitting and receive with the desired signal‐to‐noise ratio, image quality, and safety.