发明名称 |
OPEN PERMANENT MAGNET STRUCTURE FOR GENERATING HIGHLY UNIFORM FIELD |
摘要 |
A hybrid permanent magnet structure (71) for providing a uniform magnetic field within a region of interest while allowing access via open ends by a patient for NMR scanning and by a surgeon to the patient via a large opening (56) at the top. The magnet structure comprises nested inner and outer magnetic structures separated by ferromagnetic material and surrounded by a ferromagnetic yoke (70). The inner magnetic sections comprise end blocks of triangular cross section (64, 66), and the outer magnetic sections comprise end blocks of trapezoidal cross section (65, 67, 68). Field distortion compensating means is provided by a primary filter structure to the ferromagnetic material and by magnetic insertions or a secondary filter structure.
|
申请公布号 |
WO9629614(A1) |
申请公布日期 |
1996.09.26 |
申请号 |
WO1996US03358 |
申请日期 |
1996.03.12 |
申请人 |
NEW YORK UNIVERSITY |
发明人 |
ABELE, MANLIO, G.;RUSINEK, HENRY;JENSEN, JENS |
分类号 |
G01R33/383;A61B5/055;G01R33/38;G01R33/3873;G01V3/00;G01V3/14;G03G21/00;H01F7/02;(IPC1-7):G01V3/00 |
主分类号 |
G01R33/383 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|