Title :
Open MRI Magnet With Iron Rings Correcting the Lorentz Force and Field Quality
Author :
Qiuliang Wang ; Hui Wang ; Jie Zheng ; Yinming Dai ; Xuchen Zhu ; Qun He ; Junsheng Cheng ; Shunzhong Chen ; Shousen Song ; Baozhi Zhao ; Chunyan Cui ; Yi Li ; Housheng Wang ; Lankai Li ; Zhipeng Ni ; Zhongkui Feng ; Luguang Yan ; Jianyi Xu
Author_Institution :
Inst. of Electr. Eng., Beijing, China
Abstract :
A magnetic resonance imaging (MRI) superconducting magnet with openness can reduce claustrophobia of a patient. To fabricate an open MRI magnet, a new magnet configuration with iron rings and pole plates balancing the force between the coil and the yoke, and correcting the field homogeneity has been proposed. An MRI magnet with the center field of 0.7 T generated by split-pair coils and yokes is fabricated. The coils are contained in the cryostat with separated vessels connected with two pipes. The coils are separated with a room temperature gap of 480 mm and the diameter spherical volume (DSV) of 300 mm in which the homogeneity is 3 ppm in peak-to-peak. The cryogenic system is cooled by one GM cryo-cooler to realize the zero boiling off liquid helium. In the paper, the detailed design, fabrication, and test will be reported.
Keywords :
biomedical MRI; biomedical equipment; cryogenics; superconducting magnets; GM cryo-cooler; Lorentz force; claustrophobia; cryogenic system; diameter spherical volume; field quality; iron rings; magnet configuration; magnetic flux density 0.7 T; magnetic resonance imaging superconducting magnet; open MRI magnet; pole plates; split-pair coils; temperature 293 K to 298 K; zero boiling off liquid helium; Coils; Helium; Iron; Magnetic fields; Magnetic noise; Magnetic resonance imaging; Superconducting magnets; Iron-rings balancing Lorentz force; open magnetic resonance imaging (MRI); superconducting magnet; zero boiling off liquid helium;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2013.2290587
