| Patent Number |
Title Of Patent |
Date Issued |
| 7565189 |
MRI gradient coils with reduced neural stimulation |
July 21, 2009 |
| 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 |
| 7563172 |
Interchangeable putter system |
July 21, 2009 |
| 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 |
April 18, 2006 |
| 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 |
| 6519343 |
Active control of acoustic output in gradient coils |
February 11, 2003 |
| 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. |
| 5990680 |
Active acoustic control in quiet gradient coil design for MRI |
November 23, 1999 |
| 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 |
October 26, 1999 |
| 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 |
June 9, 1998 |
| 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 |
May 16, 1995 |
| 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 |
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 |
August 9, 1994 |
| 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 |
June 28, 1994 |
| 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 |
June 14, 1994 |
| 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 |
December 1, 1992 |
| 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 |
| 5162736 |
NMR imaging |
November 10, 1992 |
| 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 |
September 1, 1992 |
| 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 |
December 18, 1990 |
| 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 |
January 23, 1990 |
| 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 |
October 10, 1989 |
| 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 |
| 4820986 |
Inductive circuit arrangements |
April 11, 1989 |
| 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 |
May 13, 1986 |
| 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 |
April 2, 1985 |
| 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 |
March 2, 1982 |
| 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 |
October 2, 1979 |
| 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 |
August 21, 1979 |
| 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 |
Nuclear magnetic resonance apparatus and methods |
September 19, 1978 |
| 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 |
Image formation using nuclear magnetic resonance |
May 3, 1977 |
| 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 |
