公开(公告)号：EP1340456A4

公开(公告)日：2005-11-09

申请号：EP01271111

申请日：2001-12-04

申请人： HITACHI LTD ,  HITACHI MEDICAL CORP

发明人： KAKUGAWA SHIGERU ,  AZUMA KATSUNORI ,  WAKUDA TSUYOSHI ,  WADAYAMA YOSHIHIDE ,  TAKESHIMA HIROTAKA ,  SAKAKIBARA KENJI ,  YATSUO TAKESHI ,  HONMEI TAKAO

IPC分类号： G01R33/38 ,  G01R33/3815 ,  G01R33/421 ,  A61B5/055

CPC分类号： G01R33/421 ,  G01R33/3806 ,  G01R33/3815

摘要： A magnet device provided with a shield current carrying means in which two sets of magneto static field generating sources for generating magnetic fields directed toward a first direction are disposed facing each other across a finite region and at least one set of the magnetostatic field generating sources are disposed on at least two almost concentric circles, wherein, on a first plane including a first axis, a second axis and a first point, the first point being a point of intersection between the first axis parallel to the first direction and passing the almost center of the shied current carrying means and the second axis crossing at right angles the first axis and spaced an almost equal distance from the two sets of the generating sources, positive and negative current carrying directions of one set out of two sets of magnetostatic field generating sources or those in respective sets are arranged alternately, when an angle formed by a half line at the n-th point position from the first point to extend toward the geometric center of a section of the shield current carrying means and the first axis is theta n, and the current carrying directions of the shield current carrying means are set in the order of increasing theta n.