US 12,287,388 B2
Magnetic particle imaging device
Kota Nomura, Tokyo (JP); Kodai Katagiri, Tokyo (JP); Tetsuya Matsuda, Tokyo (JP); Shun Tonooka, Tokyo (JP); and Kazuki Yamauchi, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Appl. No. 17/912,042
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Apr. 16, 2020, PCT No. PCT/JP2020/016734
§ 371(c)(1), (2) Date Sep. 16, 2022,
PCT Pub. No. WO2021/210135, PCT Pub. Date Oct. 21, 2021.
Prior Publication US 2023/0184862 A1, Jun. 15, 2023
Int. Cl. G01R 33/563 (2006.01); G01R 33/3815 (2006.01); G01R 33/38 (2006.01)
CPC G01R 33/56375 (2013.01) [G01R 33/3815 (2013.01); G01R 33/3804 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A magnetic particle imaging device to image a distribution of a magnetic particle in an inspection object, the magnetic particle imaging device comprising:
a static magnetic field generator to generate a non-magnetic field region;
an alternating current (AC) magnetic field application instrument to apply an AC magnetic field to the non-magnetic field region; and
a magnetization distribution measuring instrument to measure a harmonic signal emitted from a magnetic particle in the non-magnetic field region,
wherein the magnetization distribution measuring instrument includes:
a detection coil having an axis parallel to a direction of the AC magnetic field in order to detect a magnetization signal;
a measuring instrument connected to the detection coil; and
a resonance frequency variable device including a capacitor connected in parallel to the detection coil in order to adjust a resonance frequency of the detection coil and the measuring instrument, and
a capacity of the capacitor is adjusted such that a resonance frequency of a closed circuit including the detection coil, the measuring instrument, and the resonance frequency variable device coincides with a frequency of the harmonic signal,
the measuring instrument includes:
a transfer coil to be energized with a current based on a magnetic signal generated from the inspection object, and to excite a magnetic field based on an energizing current; and
a magnetic measuring instrument to measure a magnetic field excited by the transfer coil, and
the closed circuit includes the detection coil, the transfer coil, and the resonance frequency variable device.