Surface coil system for magnetic resonance imaging
US4793356A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 14, 1985 |
| Grant date | Dec 27, 1988 |
| Priority date | — |
| Expiry date | Aug 14, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/341
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A resonance exciting coil (C) excites magnetic resonance in nuclei disposed in an image region in which a main magnetic field and transverse gradients have been produced. A flexible receiving coil (D) includes a flexible plastic sheet (40) on which one or more loops (20) are adhered to receive signals from the resonating nuclei. Velcro straps (46) strap the flexible sheet and the attached coil into close conformity with the surface of the portion of the patient to be imaged. An impedance matching or coil resonant frequency adjusting network (50) is mounted on the flexible sheet for selectively adjusting at least one of an impedance match and the peak sensitivity resonant frequency of the receiving coil. A preamplifier (52) amplifies the received signals prior to transmission on a cable (24). A selectively variable voltage source (70) applies a selectively adjustable DC bias voltage to the cable for selectively adjusting at least one of the impedance match and the LC resonant frequency of the receiving coil. The received signals are amplified by an amplifier (82) and processed by an image processor (30) to form man-readable images of the examined region of the patient for display on…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.