Radio frequency (RF) probes designed like by microstrip patch antennas create uniform and strong magnetic field in high frequency MRI machines, unlike convention coil and bird cage shaped coils used today. These probes also showed smaller radiation losses, making them competitive, even advantageous to conventional methods.
from Engineering and Construction News – ScienceDaily https://www.sciencedaily.com/releases/2018/10/181031141505.htm
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