Transmit mode coil detuning for MRI systems
US6850067B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 19, 2003 |
| Grant date | Feb 1, 2005 |
| Priority date | — |
| Expiry date | May 19, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/3628
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A detuning circuit for an MRI coil having a series tuning capacitor includes: a detuning inductor and a PIN diode in parallel communication with the tuning capacitor, where the tuning capacitor has a tuning inductor node and a PIN diode node; a first diode and a second diode in parallel communication with the PIN diode, where the first, second and PIN diodes are arranged with the same serial polarity and the first and second diodes have a common node; and a reactance in communication between the common node and the tuning inductor node. The circuit detunes the MRI coil in response to an MRI transmit pulse. A detuning circuit for an MRI coil having a series tuning capacitor includes a detuning inductor; and a detuning switch in parallel combination with a secondary tuning capacitor, the detuning inductor and the parallel combination being in parallel communication with the series tuning capacitor. The secondary tuning capacitor acts to reduce current during detuning of the MRI coil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.