Fig. 5: Comparison of several generations of radiofrequency (RF) coil systems and characterization of 120 kW RF coil for liter-scale nanowarming.
From: Physical vitrification and nanowarming at liter-scale CPA volumes: toward organ cryopreservation
a Photo of the RF coil system is shown alongside the schematic of the coil’s approximate uniform volume (blue cylindrical region) with diameter (D) and length (L) listed next to blue region (not to scale). The bottom table compares operating power, magnetic field strength, frequency, sample volume, and uniformity of the systems. Note that the RF coil uniformity is a % variation of magnetic field strength across the RF coil volume (blue cylinders). The top green arrow shows the increasing sample scale for RF coils with practical capacities, such as 1 mL cryovials in a 1 kW coil, human ovaries and eyes in a 15 kW coil, and human kidney and heart in a 120 kW coil. b Photo of the RF coil bore and RF probe placement for magnetic field measurements with labels showing relative radial directions (North (N), South (S), East (E), and West (W)). c Plot of measured magnetic field strength vs. coil power. d Plot of magnetic field strength vs. axial location for different radial locations. The 120 kW system frequency is fixed at 360+/− 5 kHz.
