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| Number | Title | Issue Date |
| 5207224 | Magnetic resonance apparatus A magnetic resonance imaging apparatus using a transverse magnet system (29) and having a patient handling arrangement (31, 33) which allows transport of a patient into the magnet system by first moving the patient in a direction (A) at right angles to th... | 05/04/1993 |
| 5034691 | Magnetic resonance methods and apparatus A magnetic resonance method comprising the steps of exciting magnetic resonance in nuclei in a planar region of a body, applying a first gradient magnetic field having a periodically reversing gradient in a first direction across the region in conjunction... | 07/23/1991 |
| 5015955 | Magnetic resonance methods A method of reducing the effects of eddy currents produced by a gradient magnetic field pulse pattern applied to a body in a magnetic resonance method by selecting the rates of change of magnetic flux produced during the edges of the or each pulse of the ... | 05/14/1991 |
| 4882560 | Coil arrangements in magnetic resonance apparatus An RF coil arrangement (23) in a magnetic resonance apparatus wherein a static magnetic field for application to a body under examination is produced in a gap (3) between a pair of pole pieces (5). The RF coil arrangement comprises at least one coil (45 o... | 11/21/1989 |
| 4870380 | Magnet arrangements A magnet arrangement for producing a magnet field in a gap (3) between a pair of pole pieces (1), e.g. to provide the main magnetic field for application to a subject for magnetic resonance imaging, wherein adjacent the pole pieces the magnet core 15 has ... | 09/26/1989 |
| 4864240 | Magnet systems A magnet system (1) for a nuclear magnetic resonance (NMR) imaging apparatus comprising a magnetic core arrangement (7, 13, 15) shaped to provide two or more discrete gaps (3, 5) of different sizes in which objects to be imaged may be placed, the magnetic... | 09/05/1989 |
| 4760337 | Nuclear magnetic resonance methods and apparatus A method of nuclear magnetic resonance imaging wherein motion artifacts in the image are reduced by compensating for variations in the coupling between the RF transmitter and/or detector coils (9A, 9B and/or 10A, 10B) and the body (43) being imaged due to... | 07/26/1988 |
| 4737754 | Method of operating an electromagnetic arrangement A method of operating an electromagnet arrangement comprising a main electromagnet and a number of correction coils for applying correction fields to the field produced by the main electromagnet to produce a resultant desired homogeneous magnetic field in... | 04/12/1988 |
| 4730620 | Nuclear magnetic resonance method and apparatus for reducing motion artifacts A method, and an apparatus for performing the method, are described, for imaging a region of a body using NMR in which part of the region is moving with a motion such that its displacement with respect to time is a nonmonotonic function during the time pe... | 03/15/1988 |
| 4728889 | Spectroscopy method An NMR spectroscopy method monitors a component of a sample, the component having two resonances in coupled together different spectral regions. The first resonance lies in a region including a resonance of a second component of a sample while the second ... | 03/01/1988 |
| 4710741 | Electromagnet arrangements for producing a magnetic field of high homogenity A coil arrangement for producing a magnetic field of high homogeneity, such as is required in magnetic resonance imaging, comprising a single pair of identical annular coils (17A, 17B) disposed coaxially in spaced relationship and a pair of annular member... | 12/01/1987 |
| 4703269 | Nuclear magnetic resonance imaging methods and apparatus A nuclear magnetic resonance imaging method and apparatus using the Hahn spin echo technique wherein dephasing of spins due to selection field gradients (G1x, G2x, G3x) applied during the radio frequency excitation pulses (B1 (90°), B2 (90°), B3 (90°) ... | 10/27/1987 |
| 4699148 | Nuclear magnetic resonance imaging In a steady state free precession (SFP) magnetic resonance imaging method, after each pulse of an applied train of phase coherent RF pulses which excite magnetic resonance spins in a region of a body being examined, magnetic field gradients are applied to... | 10/13/1987 |
| 4646023 | Nuclear magnetic resonance imaging An NMR chemical shift imaging method and apparatus wherein a number of experiments are performed with different encoding gradients sufficient to obtain a desired spatial resolution in the image, and each of said number of experiments is repeated for each ... | 02/24/1987 |
| 4642568 | Nuclear magnetic resonance methods and apparatus An NMR imaging method and apparatus wherein spatial encoding of spins is effected by applying a radio frequency field (B2) having a gradient, thereby avoiding the eddy current problems which can arise with d.c. gradient magnetic pulses conventionally used... | 02/10/1987 |
| 4631480 | Nuclear magnetic resonance method and apparatus In a method of imaging a body in which nuclear magnetic resonance is excited in a region including part of the body, and the free induction decay signal is measured, a quantity of a material of known nuclear magnetic resonance properties is included in th... | 12/23/1986 |
| 4613819 | Nuclear magnetic resonance imaging apparatus A phantom for use in assessing the performance of an NMR imaging apparatus which enables quantitative assessments of image slice width and spatial resolution under different conditions of contrast to be made, and which enables an assessment of overall per... | 09/23/1986 |
| 4607221 | Nuclear magnetic resonance method and apparatus A method and apparatus for determining the rate and direction of flow of a liquid in a selected region of a body by NMR techniques. NMR is excited preferentially in a slice of the body which includes the region and then a magnetic field having a gradient ... | 08/19/1986 |
| 4604578 | Nuclear magnetic resonance methods and apparatus In a method of investigating the distribution of a quantity in a chosen region of a body (E) by nuclear magnetic resonance techniques movement of the body during the investigation is monitored by probes (A, B C) attached to the body and responsive to magn... | 08/05/1986 |
| 4564813 | Nuclear magnetic resonance method and apparatus A method of nuclear magnetic resonance imaging of a body in which the spins of a chosen nucleus in a selected slice of the body are rotated through an angle appreciably greater than 90°. Two r.f. pulses, each accompanied by a magnetic field having a grad... | 01/14/1986 |
| 4563647 | Nuclear magnetic resonance methods and apparatus A method of exciting nuclear magnetic resonance at a particular location of a body comprises: exciting first nuclear spins in the body (A, Gx, -G'x, B, Gxd, C, Gy, -G'y, D) so that spins occurring in a first selected region of the body have their spin vec... | 01/07/1986 |
| 4554925 | Nuclear magnetic resonance imaging method A nuclear magnetic resonance imaging apparatus associated with heat treatment means (45) and arranged to examine material subjected to heat treatment. The heat treatment means may be automatically controlled in dependence on any output produced by the ima... | 11/26/1985 |
| 4553096 | Nuclear magnetic resonance method and apparatus A method and apparatus for determining the spatial distribution of the chemical shift spectra of a chosen element across a region of a body. Where the region is a slice, nuclear magnetic resonance for the element is excited preferentially in the slice. Fi... | 11/12/1985 |
| 4534358 | Nuclear magnetic resonance imaging apparatus A nuclear magnetic resonance imaging apparatus for medical use wherein a patient to be examined is positioned on support means (1) in a sitting posture and the required magnets (7, 11) and RF coils (13, 15) are arranged so as to allow easy movement of the... | 08/13/1985 |
| 4520828 | Nuclear magnetic resonance method and apparatus A method and apparatus for determining the rate of flow of a liquid in a selected region of a body by nuclear magnetic resonance techniques. The method includes a sequence of applying a first magnetic pulse (B1 (90°)) effective to excite nucle... | 06/04/1985 |
| 4475084 | Nuclear magnetic resonance detector Method and apparatus for producing an N.M.R. picture of a plane through an object by isolating the plane using an oscillating gradient and interrogating the plane using a rotating gradient and a multiplicity of R.F. pulses which are averaged over a define... | 10/02/1984 |
| 4454474 | Nuclear magnetic resonance systems A method of examining a slice of a body by nuclear magnetic resonance in which a steady magnetic field, and a gradient field Gz along the same axis define the slice to be examined. A periodic magnetic field H1 at the Larmor frequency... | 06/12/1984 |
| 4449097 | Nuclear magnetic resonance systems Nuclear magnetic resonance methods have been proposed for examination of large bodies, including medical examination of patients. These include so-called steady state free precession methods. Such methods involve alternating excitation of a region of the ... | 05/15/1984 |
| 4424488 | Nuclear magnetic resonance apparatus In Nuclear Magnetic Resonance (NMR) imaging systems it is known to excite resonance in a slice of a body and to sample the resonance signals in the presence of a field gradient across the slice. The gradient field is pulsed. Where such systems analyse the... | 01/03/1984 |
| 4418316 | Nuclear magnetic resonance apparatus In nuclear magnetic resonance (NMR) imaging systems it is known to excite resonance in a slice of a body and then to sample the resonance signals in the presence of a field gradient across the slice. It has been proposed that the signals should be sampled... | 11/29/1983 |
| 4417209 | Nuclear magnetic resonance apparatus In NMR imaging systems a pulsed field gradient may be applied across an excited slice (1) and the resonance signal detected during the field gradient pulse. It has been usual to demodulate the resonance signal at the Larmor frequency for a strip at the ce... | 11/22/1983 |
| 4384255 | Nuclear magnetic resonance systems The invention concerns the production of gradient fields for nuclear magnetic resonance apparatus particularly imaging apparatus. It has been earlier proposed that samples of the resonance signal be taken at intervals such that the field gradient integral... | 05/17/1983 |
| 4379262 | Nuclear magnetic resonance systems The invention is suitable for a small nuclear magnetic resonance pulse head applicable to a part of the body in the manner of ultrasonic systems. The arrangement generates a field which varies in amplitude with distance from the head, being uniform at sur... | 04/05/1983 |
| 4362993 | Imaging systems The invention provides RF field coils and detector coils for an NMR machine. The two coils are specially designed for their respective purpose, the transmit coil (5, 6) being rectangular and the received coil (7-11) substantially elliptical with defined a... | 12/07/1982 |
| 4361807 | Nuclear magnetic resonance systems The invention provides an investigation of chemical shift for an element, for example phosphorus, in a region of a body, in one example resonance is preferentially in a line in a slice of the body. Frequency dispersion down the line is produced by a pulse... | 11/30/1982 |
| 4355282 | Nuclear magnetic resonance systems The invention is related to the so-called "echo-planar" method of NMR imaging. In that method a resonance is first excited in a slice and then two orthogonal gradients provided dispersion in the slice. One gradient is pulsed to space the frequencies of sp... | 10/19/1982 |
| 4340862 | Imaging systems In an NMR examining arrangement for producing an image of a region, generally a planar slice, of a body, it has been suggested to derive, from the resonance signals, a plurality of values, for strips in the slice, and then to convolve them with a convolut... | 07/20/1982 |
| 4339718 | Coil arrangements For NMR purposes a uniform magnetic field has been produced by field coils. It is known to use a cosinusoidal distribution to produce a uniform field. However, a large-diameter low-inductance coil is required for NMR and it is difficult to wind a small nu... | 07/13/1982 |
| 4339716 | Nuclear magnetic resonance systems In a NMR pulse sequence dispersion caused by inhomogeneity in the steady axial magnetic field may be reduced by applying a 180° `spin-echo` RF pulse. However, whereas it is possible in known pulse sequences to apply a 90° RF pulse in the presence of a s... | 07/13/1982 |
