US 11,925,419 B2
Systems and methods for position determination
Xinyue Zhang, Shanghai (CN); and Tuoyu Cao, Shanghai (CN)
Assigned to SHANGHAI UNITED IMAGING HEALTHCARE CO., LTD., Shanghai (CN)
Filed by SHANGHAI UNITED IMAGING HEALTHCARE CO., LTD., Shanghai (CN)
Filed on Oct. 28, 2021, as Appl. No. 17/452,577.
Claims priority of application No. 202011628121.2 (CN), filed on Dec. 30, 2020; and application No. 202011628122.7 (CN), filed on Dec. 30, 2020.
Prior Publication US 2022/0202499 A1, Jun. 30, 2022
Int. Cl. A61B 34/20 (2016.01); A61B 5/00 (2006.01); A61B 5/055 (2006.01); A61B 5/06 (2006.01); G01R 33/032 (2006.01)
CPC A61B 34/20 (2016.02) [A61B 5/0035 (2013.01); A61B 5/055 (2013.01); A61B 5/062 (2013.01); A61B 5/721 (2013.01); G01R 33/032 (2013.01); A61B 2034/2051 (2016.02)] 19 Claims
OG exemplary drawing
 
1. A method implemented on a computing device having at least one processor and at least one storage device, the method comprising:
obtaining, via a plurality of sensors, real-time target magnetic field information of a target subject, wherein the plurality of sensors are configured on the target subject, the plurality of sensors include a plurality of diamond nitrogen-vacancy (NV) center sensors, the target subject is located in a reference magnetic field in a magnetic resonance imaging (MRI) system, the real-time target magnetic field information refers to a magnetic field strength vector corresponding to a magnetic field direction in a magnetic field coordinate system of the reference magnetic field, the reference magnetic field includes a main magnetic field and a plurality of gradient magnetic fields generated by the MRI system; and
determining real-time target position information of the target subject based on the real-time target magnetic field information of the target subject and magnetic field distribution information of the reference magnetic field in the MRI system, the magnetic field distribution information of the reference magnetic field reflecting a relationship between target position information of the target subject in the reference magnetic field and target magnetic field information of the target subject in the reference magnetic field, the real-time target magnetic field information of the target subject being the target magnetic field information of the target subject obtained in real time, and the real-time target position information of the target subject being the target position information of the target subject determined based on the real-time target magnetic field information of the target subject, wherein the real-time target magnetic field information of the target subject is obtained by:
for each pair of at least one pair of magnetic resonance peaks of a diamond NV center in the diamond NV center sensor, obtaining candidate magnetic field information related to a corresponding crystal axis direction in a crystal coordinate system of the diamond NV center, the candidate magnetic field information referring to a magnetic field strength vector corresponding to the corresponding crystal axis direction in the crystal coordinate system of the diamond NV center; and
determining the real-time target magnetic field information based on the candidate magnetic field information of each pair of the at least one pair of magnetic resonance peaks of the diamond NV center and a coordinate transformation relationship between the crystal coordinate system of the diamond NV center and the magnetic field coordinate system of the reference magnetic field.