公开(公告)号：EP0134701A2

公开(公告)日：1985-03-20

申请号：EP84305284.6

申请日：1984-08-03

Applicant: TECHNICARE CORPORATION

Inventor： Compton, Russell Allen ,  Kramer, David Moses ,  Hinshaw, Waldo Stephen

IPC: G01N24/06 ,  G01N24/08

CPC classification number: G01R33/385 ,  G01R33/381

Abstract: The null point in the gradient field of an NMR imaging system is offset from its nominal position in the static magnetic field by application of a bias field to the gradient field. The bias field produces a substantially uniform offset in the field intensity at every point in the gradient field. Alternatively, null point offset may be achieved by controll- ably superimposing two gradient fields of separately located null points.