Gradient coils for MRI systems having multiple current density zones
US6657432B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 25, 2002 |
| Grant date | Dec 2, 2003 |
| Priority date | — |
| Expiry date | Sep 25, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/385
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A process of providing a gradient field includes providing a pair of opposing magnets and associated magnet poles, which are divided into zones. For each zone, a target current density is determined, and is modeled after a mathematical series, at least two of which are different. Gradient coils are formed from wires disposed on the magnet poles along paths corresponding to the mathematical series. A current source is connected to the gradient coils to provide the gradient field. A magnetic resonance imaging system includes a pair of opposing magnets and magnet poles, and a pair of gradient coils. The gradient coils are formed from wires disposed along paths on each magnet pole, which are divided into zones defined by a shape of the wire path in that zone. The shape in each zone corresponds to a mathematical series, which are different in at least two of the zones.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.