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1. US6519343 - Active control of acoustic output in gradient coils

Office United States of America
Application Number 09254844
Application Date 11.03.1999
Publication Number 6519343
Publication Date 11.02.2003
Grant Number 6519343
Grant Date 11.02.2003
Publication Kind B1
IPC
A61F 11/06
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
11Methods or devices for treatment of the ears, e.g. surgical; Protective devices for the ears, carried on the body or in the hand
06Protective devices for the ears
A61B 5/055
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
5Measuring for diagnostic purposes; Identification of persons
05Measuring for diagnosis by means of electric currents or magnetic fields
055involving electronic or nuclear magnetic resonance, e.g. magnetic resonance imaging
G01R 33/38
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33Arrangements or instruments for measuring magnetic variables
20involving magnetic resonance
28Details of apparatus provided for in groups G01R33/44-G01R33/6496
38Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
G01R 33/385
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33Arrangements or instruments for measuring magnetic variables
20involving magnetic resonance
28Details of apparatus provided for in groups G01R33/44-G01R33/6496
38Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
385using gradient magnetic field coils
G10K 11/00
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
KSOUND-PRODUCING DEVICES;  METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
11Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
G10K 11/16
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
KSOUND-PRODUCING DEVICES;  METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
11Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
16Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
CPC
G10K 11/178
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
KSOUND-PRODUCING DEVICES
11Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
16Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
175using interference effects; Masking sound
178by electro-acoustically regenerating the original acoustic waves in anti-phase
G01R 33/3854
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33Arrangements or instruments for measuring magnetic variables
20involving magnetic resonance
28Details of apparatus provided for in groups G01R33/44 - G01R33/64
38Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
385using gradient magnetic field coils
3854means for active and/or passive vibration damping or acoustical noise suppression in gradient magnet coil systems
G10K 2210/1161
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
KSOUND-PRODUCING DEVICES
2210Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
10Applications
116Medical; Dental
1161NMR or MRI
G10K 2210/1291
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
KSOUND-PRODUCING DEVICES
2210Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
10Applications
129Vibration, e.g. instead of, or in addition to, acoustic noise
1291Anti-Vibration-Control, e.g. reducing vibrations in panels or beams
G10K 2210/3026
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
KSOUND-PRODUCING DEVICES
2210Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
30Means
301Computational
3026Feedback
G10K 2210/3027
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
KSOUND-PRODUCING DEVICES
2210Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
30Means
301Computational
3027Feedforward
Inventors Mansfield, Peter
Agents Kilpatrick Stockton, LLP
Priority Data 9620138 27.09.1996 GB
Title
(EN) Active control of acoustic output in gradient coils
Abstract
(EN)

An acoustically controlled magnetic coil system is provided in which suitable non-magnetic transducers are embedded in a block of acoustic material in which the coil is also embedded, the transducers being energised to oppose the vibratory noise generated by the coil when energised.