| Patent Number
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Title Of Patent
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Date Issued
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| 7565189
|
MRI gradient coils with reduced neural stimulation
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July 21, 2009
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| A novel approach to the design of gradient coils for MRI is introduced which takes into account from the start the effects of induced E-fields and hence currents in a patient subjected to time dependent magnetic field gradients. The approach has led to conceptually novel designs of g
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| 7563172
|
Interchangeable putter system
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July 21, 2009
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| An interchangeable putter system for the customization of putters to individual players and for increasing the versatility of putting on various putting surfaces. The system includes a club head and a plurality of interchangeable face plates. Each of the face plates includes a front
|
| 7030610
|
Active acoustic control with flexible joints in gradient coil design for MRI
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April 18, 2006
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| A method of producing an acoustically quiet coil design comprising first inner and outer surface conductor portions on a first block of material and second inner and outer surface conductor portions on a second block of material and including forming said portions of said each of said
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| 6519343
|
Active control of acoustic output in gradient coils
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February 11, 2003
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| 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.
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| 5990680
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Active acoustic control in quiet gradient coil design for MRI
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November 23, 1999
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| Acoustically controlled magnetic coils comprise first and second electrical conductors which are mechanically coupled by a block of material of defined acoustic transmission characteristics which holds the conductors a predetermined distance apart. The conductors are supplied with curren
|
| 5973495
|
Method and apparatus for eliminating mutual inductance effects in resonant coil assemblies
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October 26, 1999
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| Method and apparatus for eliminating mutual inductance effects in resonant coil assemblies in which a plurality of coils are situated in sufficiently close proximity to create small mutual inductances between the coils. The method comprises evaluating the mutual inductances using a T, st
|
| 5764059
|
Acoustic screen
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June 9, 1998
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| The invention describes apparatus for, and a method of, active acoustic screening and combined active acoustic and magnetic screening, of magnetic field coils, which pass a time varying current and which reside in relatively high static magnetic fields, typically greater than about 0.1
|
| 5416414
|
Sample mount for NMR microscopy
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May 16, 1995
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| A sample mount for NMR microscopy and NMR spectroscopy which enables a specimen to be accurately placed within an NMR apparatus and if required in a preferred embodiment for the specimen to be examined under an optical microscope to enable the images to be accurately compared.
|
| 5363036
|
Echo-volumar imaging using 180 degree RF pulses
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November 8, 1994
|
| A method of producing a magnetic resonance image of a defined region of an object by an echo volumar imaging process including subjecting the object to an initial selection process to select a thick slice within the object to produce an active volume of spin magnetisation subjecting the
|
| 5336999
|
Echo planar imaging using 180 degrees pulses
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August 9, 1994
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| A magnetic resonant image of an object is produced by subjecting the object to an initial slice selection to provide an active region and by subjecting the active region to a plurality of 180.degree. RF pulses and appropriate amplitude modulated x and y gradients.
|
| 5325060
|
Coil circuits
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June 28, 1994
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| A coil circuit comprising a multi-mode resonant gradient or RF coil circuits for imaging and spectroscopy in Nuclear Magnetic Resonance systems.
|
| 5321360
|
Resonant cavities for NMR
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June 14, 1994
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| A resonant array for NMR for use at high frequencies, the array comprising two identical end structures and a plurality of continuous rods joining the identical end structures to comprise a plurality of or electrical circuit sections, the continuous rods being of electrically conductive
|
| 5168228
|
Echo planar imaging systems
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December 1, 1992
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| Zonal magnification of a selected area of an image produced by Echo Planar Imaging is acheived by taking images of a defined area in the presence of a selective 180.degree. R.F. control pulse so that subsequent processing produces a magnified image of the selected area with enhanced reso
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| 5162736
|
NMR imaging
|
November 10, 1992
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| A nuclear magnetic resonance (NMR) method of producing a series of three or four dimensional spin parameter maps of a defined region, which spin parameter maps are displayable as a set of contiguous planar spin parameter maps with arbitrary orientation.
|
| 5143688
|
Surface electrical coil structures
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September 1, 1992
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| A surface electrical coil structure for use as a signal receiver and/or transmitter with the desired magnetic field characteristics and which comprises a plurality of small coils positioned over or around a specified volume each coil being singly or severally electrically connected such
|
| 4978920
|
Magnetic field screens
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December 18, 1990
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| The screen is provided by surrounding the coil producing the magnetic field with a set of electrical conductors the currents within the conductors being controlled in such a manner that the field is neutrailized in a specific region of space, the current distribution within the conductor
|
| 4896129
|
Magnetic field coils
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January 23, 1990
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| A magnetic coil comprising a plurality of conductors is designed by calculation of the continuous current density required on the surface on which the conductors are positioned to generate a specific magnetic field on a further target surface or at specified points.
|
| 4873503
|
Electrical coils
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October 10, 1989
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| A magnetic field of required strength is provided in a desired space by a set of electrical conductors supplied with an electrical current or currents the current distribution being determined by the induced surface current distribution in a conductive former shaped to be of the same sha
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| 4820986
|
Inductive circuit arrangements
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April 11, 1989
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| A switched coil arrangement is connected in a bridge configuration of four switches S.sub.1, S.sub.2, S.sub.3 and S.sub.4 which are each shunted by diodes D.sub.1, D.sub.2, D.sub.3 and D.sub.4 so that current can flow in either direction through a coil L depending on the setting of the
|
| 4588948
|
Nuclear magnetic resonance methods
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May 13, 1986
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| A method of investigating a body by nuclear magnetic resonance comprising preferentially exciting resonance in a slice of the body, applying a magnetic field to the body having first and second gradients (Gx, Gy) in different directions in the slice with both the gradients being peri
|
| 4509015
|
Nuclear magnetic resonance methods
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April 2, 1985
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| This invention provides methods of investigating a body by nuclear magnetic resonance. Nuclear magnetic resonance is preferentially excited in a slice of the body and the resulting free induction decay signals are detected in the presence of a magnetic field having first and second gradi
|
| 4318044
|
Methods of indicating nuclear spin density distribution
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March 2, 1982
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| Spin density distribution in a sample subjected to a static magnetic field along a y-axis is determined by subjecting the sample to an initial magnetic field gradient Gz to the static field together with a 90.degree. selective rf pulse to select a strip. The Gz gradient is then replaced
|
| 4169380
|
Electronic circuit arrangement
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October 2, 1979
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| A display device has its input information subject to a non-linear processing in order to compensate for the non-linearity of a sensor or in order to enhance the display. The input is periodically read and after processing is converted to a time signal by means of a down counter fed
|
| 4165479
|
Nuclear magnetic resonance apparatus and methods
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August 21, 1979
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| The nuclear magnetic resonance spin density distribution in a sample is obtained by subjecting the sample to a static magnetic field and exciting the sample with a selective or non-selective r.f. excitation pulse and a combination of magnetic field gradients which vary in directions alon
|
| 4115730
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Nuclear magnetic resonance apparatus and methods
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September 19, 1978
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| A nuclear magnetic resonance spin density distribution in a sample is obtained for a selected plane or planes by placing the sample in a static magnetic field, applying a gradient to the field and simultaneously applying selective rf pulses to select a plane or planes in the sample,
|
| 4021726
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Image formation using nuclear magnetic resonance
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May 3, 1977
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| Nuclear magnetic resonance apparatus designed to enable two and three dimensional images of objects to be obtained has coils for applying a static magnetic field and for applying magnetic gradients to the field in each of three orthogonal directions over the entire volume of a sample and
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