US 12,066,509 B2
MRI apparatus
Satoshi Imai, Nasushiobara (JP)
Assigned to CANON MEDICAL SYSTEMS CORPORATION, Otawara (JP)
Filed by CANON MEDICAL SYSTEMS CORPORATION, Otawara (JP)
Filed on Oct. 19, 2022, as Appl. No. 18/047,800.
Claims priority of application No. 2021-173032 (JP), filed on Oct. 22, 2021.
Prior Publication US 2023/0131526 A1, Apr. 27, 2023
Int. Cl. G01R 33/36 (2006.01); A61B 5/00 (2006.01); A61B 5/055 (2006.01); G01R 33/48 (2006.01)
CPC G01R 33/36 (2013.01) [A61B 5/055 (2013.01); A61B 5/6814 (2013.01); A61B 5/6823 (2013.01); G01R 33/48 (2013.01); A61B 2560/0214 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An MRI apparatus comprising:
a transmission circuit configured to apply a transmission pulse to an object;
at least one radio frequency (RF) coil configured to include an active trap circuit provided with a PIN diode, and to receive a magnetic resonance signal from the object;
a power supply circuit configured to apply a reverse bias voltage and a forward bias voltage to the PIN diode, and to apply multiple values of a forward current when the forward bias voltage is applied to the PIN diode; and
a control circuit configured to control the power supply circuit in such a manner that the power supply circuit sets the forward current to the multiple values, depending on imaging conditions.