Active control of noise and vibrations in magnetic resonance ima

Details Active control of noise and vibrations in magnetic resonance ima Active control of noise and vibrations in magnetic resonance ima

1993-08-20

1996-08-20

Kuntz, Curtis

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

1286532, 1286535, A61F 1106

Patent

active

055486533

ABSTRACT:
An active noise and vibration control system which minimizes noise output by creating a secondary, cancelling noise and/or vibration field using vibrational inputs. The system includes one or more piezoceramic actuators mounted to the inner surface of a magnetic resonance imaging device. The actuators can be either mounted directly to the device or to one or more noise cancelling members which are resiliently mounted to the device. Transducers are also provided for sensing the noise or vibrations generated by the device and producing an error signal corresponding to the level of noise or vibrations sensed. A controller sends a control signal to the actuators in response to the error signal, thereby causing the actuators to vibrate and generate a noise or vibration field which minimizes the total noise emanating from the device. Alternatively, the system can use noise and vibration feedback simultaneously.

REFERENCES:
patent: 4473906 (1984-09-01), Warnaka et al.
patent: 5146505 (1992-09-01), Pfaff et al.
patent: 5170433 (1992-12-01), Elliott
patent: 5221185 (1993-06-01), Pla et al.
patent: 5237618 (1993-08-01), Bethel
patent: 5313945 (1994-05-01), Friedlander
patent: 5370340 (1994-12-01), Pla

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