Metamaterial inspired wireless coil for clinical breast imaging

• Published in: Journal of magnetic resonance (1997) Vol. 322; p. 106877
• Main Authors: Puchnin, Viktor, Solomakha, Georgiy, Nikulin, Anton, Magill, Arthur W., Andreychenko, Anna, Shchelokova, Alena
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 01-01-2021
• Subjects: Breast MRI; Metamaterial inspired RF coils; SNR enhancement; Specific absorption rate; Split-loop resonator; Transmit efficiency; Wireless coil; Split-loop resonator; Wireless coil; SNR enhancement; Metamaterial inspired RF coils; Breast MRI; Specific absorption rate; Transmit efficiency
• ISSN: 1090-7807; 1096-0856
• DOI: 10.1016/j.jmr.2020.106877

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•A metamaterial inspired wireless coil for targeted breast MRI at 1.5T is presented.•Wireless coil is based on electromagnetically coupled split-loop resonators.•Improvements of local transmit and SAR efficiencies of the body coil were achieved.•The phantom test showed a tenfold increase of SNR when compared to the body coil.
In this work, we propose an application of a metamaterial inspired volumetric wireless coil (WLC) based on coupled split-loop resonators for targeted breast MRI at 1.5 T. Due to strong electromagnetic coupling with the body coil, the metamaterial inspired WLC locally focuses radiofrequency (RF) magnetic flux in the target region, thus improving both transmit and receive performance of the external body coil. This leads to substantial enhancement in local transmit efficiency and improvement of RF safety. Phantom images showed a tenfold increase of signal-to-noise ratio (SNR) in the region-of-interest (ROI) and, at the same time, an almost 50-fold reduction in transmit power relative to the same body coil used alone.