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A smart metasurface for scanning deep brain tissues at 1.5T MRI
Das Priyanka,Gupta Jegyasu,Sikdar Debabrata,Bhattacharjee Ratnajit 한국물리학회 2023 Current Applied Physics Vol.53 No.-
Magnetic resonance imaging (MRI) is a dual phase clinical diagnostic procedure based on nuclear magnetic resonance (NMR). In the transmission phase, the body protons are stimulated by an externally applied RF field. During the reception phase, the excited protons release RF signals which are used for imaging. The signal-to-noise ratio (SNR) of scanned images can be improved by enhancing the RF magnetic flux density. However, high strength of RF magnetic fields during excitation might cause tissue heating and inhomogeneous field distribution in the subject under scan. Selective enhancement of RF magnetic flux density solely during the imaging phase is required for averting tissue heating and image artifacts while maintaining high SNR. In order to facilitate this, we report a nonlinear metasurface which could act as a dynamic supplement to transceiver MRI coils for obtaining images with higher spatial resolution or faster acquisition while maintaining low specific absorption rate (SAR).