System and method for receiving magnetic resonance (MR) signals with an FET electrically between preamplifier terminals
US9018955B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 17, 2011 |
| Grant date | Apr 28, 2015 |
| Priority date | — |
| Expiry date | Feb 26, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/3621
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A preamplifier is provided for a radio frequency (RF) receiver coil in a magnetic resonance imaging (MRI) system. The preamplifier includes an amplifier configured to receive at least one magnetic resonance (MR) signal from the RF receiver coil and configured to generate an amplified MR signal. An input circuit is electrically connected to the amplifier. The input circuit is configured to be electrically connected to an output of the RF receiver coil for transmitting the at least one MR signal from the RF receiver coil to the amplifier. The input circuit includes an impedance transformer and a field effect transistor (FET). The FET is electrically connected between the impedance transformer and the amplifier. The FET has an FET impedance. The impedance transformer is configured to transform a source impedance of at least approximately 100 ohms. The impedance transformer is further configured to transform the FET impedance into a preamplifier input impedance of less than approximately 5 ohms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.