US 12,265,142 B1
Magnetic particle imaging (MPI) device based on asymmetric bilateral structure
Jie Tian, Beijing (CN); Zhenchao Tang, Beijing (CN); Guangxing Zhou, Beijing (CN); and Yu An, Beijing (CN)
Assigned to Beihang University, Beijing (CN)
Filed by Beihang University, Beijing (CN)
Filed on Oct. 21, 2024, as Appl. No. 18/922,363.
Claims priority of application No. 202410257753.4 (CN), filed on Mar. 7, 2024.
Int. Cl. G01R 33/12 (2006.01)
CPC G01R 33/1276 (2013.01) 9 Claims
OG exemplary drawing
 
1. A magnetic particle imaging (MPI) device based on an asymmetric bilateral structure, comprising a fixed section and a movable section;
the fixed section comprises a pair of magnetic field generation coils, and the magnetic field generation coils are configured to generate a uniform and variable magnetic field and drive the field-free point (FFP) to move along a Z-axis direction;
the movable section comprises a permanent magnet, excitation coils and a reception coil;
the permanent magnet is configured to cooperate with the magnetic field generation coils to generate the FFP; the excitation coils are configured to move the FFP on a two-dimensional plane and excite magnetic particles to generate a nonlinear response signal; the reception coil is configured to receive an MPI signal;
the Z-axis direction is an axial direction of the permanent magnet, and the two-dimensional plane is perpendicular to the Z-axis direction;
the magnetic field generation coils comprise a first magnetic field generation coil and a second magnetic field generation coil; and
the first magnetic field generation coil and the second magnetic field generation coil are symmetrically arranged at a center of an imaging field of view; direct currents of an equal magnitude and a same direction are introduced into the first magnetic field generation coil and the second magnetic field generation coil, and the first magnetic field generation coil and the second magnetic field generation coil cooperate with the permanent magnet to generate the FFP between the first magnetic field generation coil and the second magnetic field generation coil.