Patent ID: 11931135
Assignee: BEIJING UNIVERSITY OF AERONAUTICS AND ASTRONAUTICS
Field: Measurement (Instruments)
Classification: CPC A  G | IPC A  G

Claim 6:
7. The human-scale closed-bore MPI method based on the radial-Cartesian trajectory scanning according to claim 6, wherein the operation of constructing the field-free point and the dynamic magnetic field for the radial-Cartesian trajectory scanning comprises:
keeping the two circular permanent magnets and the first cylindrical coil fixed; and
controlling the two curved rectangular coils to rotate uniformly and mechanically around the central axes of the two circular permanent magnets; applying alternating currents of same magnitude and direction to the two curved rectangular coils; and applying an alternating current to the first cylindrical coil;
wherein, a frequency of the alternating current applied to the first cylindrical coil is at least N times a frequency of the alternating current applied to the two curved rectangular coils; and the frequency of the alternating current applied to the two curved rectangular coils is at least N times a mechanical rotation frequency of the two curved rectangular coils.