Remote magnetic actuation using a clinical scale system
Fig 1
Clinical scale field applicator.
(a) Schematic drawing of stacked coils (copper color), iron core (dark gray), and steel yoke (light gray) for low-frequency field generation (< 100 Hz) and flux guidance. A total of 18 coil stacks can be addressed individually by 18 amplifiers. Both at the top and bottom, six outer stacks, a cylindrical stack consisting of two segments, and a central inner stack are mounted. The elliptical coils (red, blue, green) are used for high-frequency imaging signal generation and reception and have not been used in the manipulation experiments. The transparent blue sphere indicates the 20 cm workspace. (b) Photograph of low-frequency field applicators. Gray hoses supply cooling oil, while black cables are the current connectors. (c) Final assembly of clinical MPI demonstrator. The low-frequency field generator has been completely shielded to avoid contact between the high-frequency excitation field and materials with a non-linear response. Left of the field generator, capacitors and toroidal coils are visible. Together with the drive coil (white coil with blue light), these form the resonant three orthogonal transmit/receive channels operating at approx. 150 kHz.