Active shield gradient coil for nuclear magnetic resonance imaging apparatus
US5708360A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 15, 1995 |
| Grant date | Jan 13, 1998 |
| Priority date | — |
| Expiry date | Sep 15, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/4215
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An active shield gradient coil for a nuclear magnetic resonance imaging, formed by a primary coil having a fingerprint shaped current distribution formed on an inner cylinder in which at least a part of current return lines is cut out, a shield coil having a current distribution formed on an outer cylinder, and a bridging connection member for connecting cut out part of the current return lines of the primary coil with the shield coil, in which the current distribution of the shield coil is a composition of a first shield pattern for cancelling out a magnetic field produced by the primary coil outside the outer cylinder and a second shield pattern for cancelling out a magnetic field produced by the bridging connection member outside the outer cylinder. The current distribution of the primary coil can have turn back current paths for leading the cut out part of the current return lines on one end of the gradient coil to another end of the gradient coil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.