  The combination of surface coils and metamaterials remarkably enhance
magnetic resonance imaging (MRI) performance for significant local staging
flexibility. However, due to the coupling in between, impeded signal-to-noise
ratio (SNR) and low-contrast resolution, further hamper the future growth in
clinical MRI. In this paper, we propose a high-Q metasurface decoupling
isolator fueled by topological LC loops for 1.5T surface coil MRI system,
increasing the magnetic field up to fivefold at 63.8 MHz. We have employed a
polarization conversion mechanism to effectively eliminate the coupling between
the MRI metamaterial and the radio frequency (RF) surface transmitter-receiver
coils. Furthermore, a high-Q metasurface isolator was achieved by taking
advantage of bound states in the continuum (BIC) for extremely high-field MRI
and spectroscopy. An equivalent physical model of the miniaturized metasurface
design was put forward through LC circuit analysis. This study opens up a
promising route for the easy-to-use and portable surface coil MRI scanners.
