Fig. 2 from Kandala & Sohn, Scientific Reports (2022). Reused under CC BY 4.0. Source ↗
Featured paper / Scientific Reports · 2022
Design of standalone wireless impedance matching (SWIM) system for RF coils in MRI
The gist
A loaded MRI coil can drift away from its ideal impedance, reducing power transfer and image quality. SWIM closes that loop: it generates a calibration signal, measures reflected power, searches a switched capacitor network for the best match, and lets the coil be monitored wirelessly.
3 sautomatic calibration
33 dBreturn loss
+24%SNR improvement