Asymmetric arrangement of permanent-magnetic elements for a magnetic resonance apparatus
US6534984B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 29, 2002 |
| Grant date | Mar 18, 2003 |
| Priority date | — |
| Expiry date | Mar 29, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/3808
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A main field magnet arrangement for a one-sided magnet resonance device produces a homogeneous magnetic field B in a working volume (4). The working volume (4) and the main field magnet (1) are disposed on different sides of a plane E and the main field magnet (1) has a geometric shape which permits disposal of a radio frequency (RF) receiver coil system and optionally a gradient coil system on the same side of the plane E as the main field magnet (1). Field-generating elements of permanent-magnetic material form a radially outer part (2) and a radially inner part (3) relative to an axis A extending through the center of the working volume (4), wherein the surface, facing the working volume (4), of the radially inner part (3) is axially further spaced apart from the center of the working volume (4) than the surface of the radially outer part (2) facing the working volume (4), such that a depression (5) is formed in the radially inner part (3) in the axial direction. At least the radially inner part (3) of the field-generating elements is made from permanent-magnetic material, the axes of the prismatic rods forming a grid of lines having a grid constant a. The surfaces of the prisma…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.