NMR tomography apparatus having iron-free dc motors for capacitor adjustment
US4902975A · kind A · utility
9Cited by
4References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 17, 1984 |
| Grant date | Feb 20, 1990 |
| Priority date | — |
| Expiry date | Aug 17, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/3628
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A nuclear magnetic resonance tomography apparatus has a coil for generating a basic magnetic field, a gradient coil and measuring coils. A capacitor arrangement precisely adjusts the resonance of the measurement coil to the basic field coil. An iron-free dc motor is disposed within the field generated by the basic field coil for physically adjusting the plates of the capacitors connected in the circuit including the measurement coil. The rotor and coils of the iron-free dc motor are disposed within the basic magnetic field such that the basic magnetic field functions as the stator field for operating the motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.