US 11,852,702 B2
Magnetic resonance measurement apparatus
Masato Takahashi, Wako (JP)
Assigned to RIKEN, Wako (JP)
Appl. No. 17/275,605
Filed by RIKEN, Wako (JP)
PCT Filed Sep. 10, 2019, PCT No. PCT/JP2019/035446
§ 371(c)(1), (2) Date Mar. 11, 2021,
PCT Pub. No. WO2020/054686, PCT Pub. Date Mar. 19, 2020.
Claims priority of application No. 2018-171745 (JP), filed on Sep. 13, 2018.
Prior Publication US 2022/0050157 A1, Feb. 17, 2022
Int. Cl. G01R 33/36 (2006.01); G01R 33/34 (2006.01)
CPC G01R 33/3671 (2013.01) [G01R 33/34092 (2013.01); G01R 33/3657 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A magnetic resonance measurement apparatus comprising a first LC circuit configured to form an oscillating magnetic field that causes an object to exhibit magnetic resonance, wherein
the first LC circuit includes a parallel connection assembly including a diode,
the parallel connection assembly further includes a diode connected, in parallel and in reverse direction, to the diode,
in a first state in which bias current is not applied to the diode of the parallel connection assembly and oscillating voltage for forming the oscillating magnetic field is applied to the first LC circuit, the diode of the parallel connection assembly functions as a short-circuit such that the resonance frequency of the first LC circuit becomes a first resonance frequency, and
in a second state in which bias current is not applied to the diode of the parallel connection assembly and the oscillating voltage is not applied to the first LC circuit, the diode of the parallel connection assembly functions as capacitance such that the resonance frequency of the first LC circuit becomes a second resonance frequency that is different from the first resonance frequency.