Self-shield open magnetic resonance imaging superconducting magnet

US8996083B2 · kind B2 · utility

Assignee

• Institute of Electrical Engineering, Chinese Academy of Sciences · CN

Inventors

• Qiuliang Wang · Beijing, CN
• Xinning Hu · Beijing, CN
• Chunzhong Wang · Beijing, CN
• Hui Wang · Troy, US
• Luguang Yan · Beijing, CN
• Yinming Dai · Beijing, CN
• Baozhi Zhao · Beijing, CN
• Jianhua Wang · Novi, US
• Jianyi Xu · Beijing, CN

Key dates

• Filing date: Dec 14, 2011
• Grant date: Mar 31, 2015
• Expiry date: Dec 14, 2031

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/421
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A self-shield open magnetic resonance imaging superconducting magnet comprises five pairs of coils: shim coils, first main magnetic coils, second main magnetic coils, third main magnetic coils, and shielding coils. The five pairs of coils are symmetric about the center. The shim coils are arranged closest to the center point; the first main magnetic coils, the second main magnetic coils, the third main magnetic coils, and the shielding coils are arranged in sequence outside. The first main magnetic coils are connected with reverse current. The second and third main magnetic coils are connected with positive current for providing the main magnetic field strength. The shim coils are connected with positive current for compensating the magnetic field in the central region. The shielding coils are connected with reverse current for creating a magnetic field opposite to the main magnetic field for compensating the stray magnetic field in the space.