Tracking system and pulse sequences to monitor the position of a device using magnetic resonance
US5307808A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 1, 1992 |
| Grant date | May 3, 1994 |
| Priority date | — |
| Expiry date | Apr 1, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/5617
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A tracking system employs magnetic resonance signals to monitor the position of a device such as a catheter within a subject. The device has a receiver coil which is sensitive to magnetic resonance signals generated in the subject. These signals are detected in the presence of magnetic field gradients and thus have frequencies which are substantially proportional to the location of the coil along the direction of the applied gradient. Signals are detected responsive to sequentially applied mutually orthogonal magnetic gradients to determine the position of the device in several dimensions. The position of the device as determined by the tracking system is superimposed upon independently acquired medical diagnostic images.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.