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| Number | Title | Issue Date |
| 4536711 | Method and apparatus for measuring flow in a pipe or conduit This method and apparatus is directed to measuring flow velocity of a flowing solid or fluid in a pipe. In the preferred and illustrated embodiment, a single magnet is utilized to impress a magnetic field on the flow, the field having a gradient. A concen... | 08/20/1985 |
| 4535290 | Method for measuring the nuclear magnetic resonance for NMR tomography In NMR tomography, the nuclear spins of a selected type present in a selected area of a body are selectively excited by applying first a selection gradient field and exciting thereafter the nuclear spins by a HF signal which initially effects a rotation o... | 08/13/1985 |
| 4532217 | Biological uses of shift reagents for the nuclear magnetic resonance of physiological metal cations A novel group of nuclear magnetic resonance shift reagents is disclosed. This group comprises the anionic chelates of dysprosium and thulium wherein the chelate moiety has a charge of at least -3. These reagents cause a shift in the nuclear magnetic reson... | 07/30/1985 |
| 4531094 | Methods and apparatus of obtaining NMR spectra A method of obtaining an NMR spectrum from a sample comprising the steps of: maintaining a static magnetic field along an axis which is homogeneous over at least a small volume constituting part of a sample applying a gradient to said magnetic field which... | 07/23/1985 |
| 4527124 | Method of and device for determining a nuclear magnetization distribution in a part of a body The invention proposes a method and a device in which resonance signals (generated for NMR imaging) are sampled in the presence of a (semi-) static and a time modulated gradient magnetic field, the gradient direction of the fields applied being mutually p... | 07/02/1985 |
| 4525673 | NMR spectrometer incorporating a re-entrant FIFO Cyclic instrument control and data acquisition functions which are critically dependent upon synchrony are directed from a computer based system including a FIFO buffer adapted to feedback the most recently active word from its output register and re-stor... | 06/25/1985 |
| 4521733 | NMR Imaging of the transverse relaxation time using multiple spin echo sequences Improved nuclear magnetic resonance (NMR) imaging methods based on a Carr-Purcell-Meiboom-Gill (CPMG) RF pulse sequence and pulsed magnetic field gradients applied to both multiple angle projection (MAP) imaging techniques, and to the two-dimensional Four... | 06/04/1985 |
| 4520315 | Nuclear spin tomography method A disclosed exemplary method provides complete mensuration of all two-dimensional Fourier components of a nuclear spin property and image reconstruction. In spite of unavoidable inhomogeneities of the DC magnetic field, an optimum sectional image is to be... | 05/28/1985 |
| 4520316 | NMR imaging technique A method of obtaining an NMR spectrum for at least a portion of a specimen slice is provided. The method comprises acquiring a number of projections of the specimen slice and shifting the projections by Ɗf for any point of interest. The shifted projectio... | 05/28/1985 |
| 4513247 | Method for recording three-dimensional nuclear magnetic resonance spectra and a device for carrying out the same For recording three-dimensional nuclear magnetic resonance spectra the nuclear spin-system must be excited by three 90° pulses, with variation of the pulse intervals t1 and tm. Instead of varying the two pulse intervals separately, ... | 04/23/1985 |
| 4510448 | Device for generating images of an examination subject The disclosure relates to a device for generating images of an examination subject with nuclear magnetic resonance in which a coil system for applying magnetic fields to the examination subject and for detecting the excursion of the magnetic nuclear spins... | 04/09/1985 |
| 4509015 | Nuclear magnetic resonance methods 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 fi... | 04/02/1985 |
| 4506223 | Method for performing two-dimensional and three-dimensional chemical shift imaging Selective excitation is used to excite to resonance nuclear spins located in a predetermined region of an NMR sample. Variable amplitude gradients are then used to phase encode spatial information into the NMR signal produced by the excited nuclear spins.... | 03/19/1985 |
| 4502008 | Method and apparatus for nuclear magnetic resonance spectroscopy A method and apparatus for nuclear magnetic resonance spectroscopy is disclosed which expands the decoupling bandwidth. In the method, a pulse train containing a series of radiofrequency pulses joined without interval is applied repeatedly to a sample, ea... | 02/26/1985 |
| 4502007 | Method of measuring NMR spin-spin relaxation time (T2) using spin-echos A method is disclosed for measuring the NMR spin-spin relaxation time (T2) of nuclei using spin-echos comprising the steps of locating the nuclei in a static magnetic field, applying an RF pulse to the nuclei at the Larmor frequency of the nucl... | 02/26/1985 |
| 4489275 | High temperature sample heating for spectroscopic studies apparatus In accordance with the invention, an improved sample heating apparatus is provided comprising an evacuated cylindrical envelope having a first portion of reduced diameter and capable of fitting into a cavity of a spectroscopic analysis device and capable ... | 12/18/1984 |
| 4486709 | Depth and refocusing pulses for use with inhomogeneous radiofrequency coils in nuclear magnetic resonance spectroscopy In a pulsed nuclear magnetic resonance method of analysis, in which a single radiofrequency pulse is applied using an irradiation coil which provides an inhomogeneous radiofrequency field across the sample volume, the inhomogeneity of this field ensures t... | 12/04/1984 |
| 4484138 | Method of eliminating effects of spurious free induction decay NMR signal caused by imperfect 180 degrees RF pulses A method for eliminating the effects of a spurious free induction decay (FID) NMR signal due to imperfect 180° RF pulses comprises applying a large magnitude, short duration magnetic field gradient pulse, termed the "crusher" pulse immediately following ... | 11/20/1984 |
| 4480228 | Selective volume method for performing localized NMR spectroscopy Selective irradiation is used to isolate a planar slice of nuclear spins in a nuclear magnetic resonance (NMR) sample. Selective radio frequecy pulses, applied in the presence of magnetic field gradients, are then employed to define a smaller sensitive vo... | 10/30/1984 |
| 4477777 | Analysis of biological material A method of determining or imaging fats in a non 13 C enriched biological sample, particularly human tissue comprising subjecting the sample to a magnetic field, irradiating the sample with radiofrequency electromagnetic radiation, obtaining fr... | 10/16/1984 |
| 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 |
| 4472683 | Imaging apparatus using nuclear magnetic resonance An imaging apparatus using nuclear magnetic resonance is disclosed in which both an image corresponding to the projection of a nuclear spin distribution in a to-be-inspected object on a two-dimensional plane and a display mark indicating a desired measuri... | 09/18/1984 |
| 4470014 | NMR Spectroscopy In a method of heteronuclear decoupling in high resolution pulsed NMR spectroscopy, during acquisition of signals emanating from a nuclear species to be observed (e.g. carbon-13), irradiation of an interfering nuclear species (e.g. protons) is effected by... | 09/04/1984 |
| 4468621 | Investigation of samples by N.M.R. techniques Spatially discriminated information is obtained by appropriate processing of data derived from a series of pulsed N.M.R. operations performed with a magnetic field exhibiting a linear gradient whose magnitude is different for each operation. In obtaining ... | 08/28/1984 |
| 4458203 | Nuclear magnetic resonance imaging A method of imaging a body by nuclear magnetic resonance wherein volume scanning of a region of the body is achieved by scanning a first planar slice of the region and at least one further slice of the region in the relaxation time for the scan of the fir... | 07/03/1984 |
| 4438400 | Method for suppression of acoustic ringing in NMR measurements Compensation rather than direct suppression removes the effects of acoustic ringing as encountered in pulsed nuclear magnetic resonance experiments. Single and double spin-echo excitation, combined with several alternative schemes for phase cycling both t... | 03/20/1984 |
| 4424487 | Dispersion coefficient determination Dispersion coefficients of fluids in porous media are determined by NMR spin echo techniques while the fluid is flowing through the porous medium.... | 01/03/1984 |
| 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 |
| 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 |
| 4408161 | Computer-controlled, portable spin echo NMR instrument and method of use In accordance with the present invention, permeability estimates of a carbonate sample based on spin echo diffusion characteristics of the hydrogen nuclei of interstitial fluids within the pore space of such sample, can be swiftly and accurately achieved ... | 10/04/1983 |
| 4398148 | Electromagnetic coil system for examination of large objects by nuclear magnetic resonance and whole-body imaging machine using a system In a system for obtaining images on the principle of nuclear magnetic resonance (NMR) of nuclei contained in the human body, two symmetrical coils constituting an electromagnet are spaced apart so that a patient's body can be placed transversely with resp... | 08/09/1983 |
| 4354157 | Method of and device for determining a nuclear spin density distribution in a part of a body It has been found that devices for determining nuclear spin density distributions in an object by means of nuclear spin resonance measurements produce artefacts in the calculated density distributions. The artefacts occurring are dependent of the gradient... | 10/12/1982 |
| 4333053 | Imaging systems In known NMR imaging apparatuses it has been the practice to arrange the GR field gradient, which rotates in the plane of the examined slice, with a zero crossing substantially in the center of the slice and to demodulate at the Larmor frequenc... | 06/01/1982 |
| 4329646 | Impulse resonance spectrometer An impulse resonance spectrometer is provided, wherein high frequency energy in the shape of pulses is applied to a sample material located in a polarizing magnetic field, to detect a nuclear magnetic resonance signal from the sample material. The spectro... | 05/11/1982 |
| 4321537 | Fourier transform nuclear magnetic resonance spectrometer In a Fourier transform nuclear magnetic resonance spectrometer, as is known, a pulse modulated radio frequency is applied to a sample placed in a magnetic field, and a free induction decay signal resulting from the above application is Fourier transformed... | 03/23/1982 |
| 4315216 | Imaging systems Nuclear magnetic resonance (NMR) apparatus have beenproposed for examining slices or volumes of bodies, perhaps for medical examination of patients. Magnetic fields are used to induce resonance in a selected region of a body and a resonance signal is dete... | 02/09/1982 |
| 4307343 | Moving gradient zeugmatography Nuclear magnetic resonance phenomena are employed to generate a two dimensional image of a thin planar slice through a body under investigation. The apparatus herein operates to determine the spin density distribution in a planar slab within the body whic... | 12/22/1981 |
| 4307344 | Imaging systems In a nuclear magnetic resonance imaging apparatus it has been proposed to excite resonance preferentially in a cross-sectional slice of a patient's body by applying a field gradient pulse in conjunction with a pulse of RF. It has been found that the shape... | 12/22/1981 |
| 4301411 | NMR Test method for dispersion of solids in elastomer compositions An NMR test method is provided for determining the homogeneity of dispersion of a filler substance such as carbon black in an elastomer composition such as a rubber, either on an arbitrary scale or by reference to a standard dispersion of optimum homogene... | 11/17/1981 |
| 4301410 | Spin imaging in solids using synchronously rotating field gradients and samples A method for spin imaging in solids using nuclear magnetic resonance (NMR) spectroscopy. The invention includes the steps of rotating the sample about an axis which makes a particular angle with the NMR static external magnetic field, rotating a magnetic ... | 11/17/1981 |
