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4719406 Phantom for performance evaluation of a nuclear magnetic resonance scanner
X
New Patents
suitable for enhancing of the gastrointestinal tomography.
contrast in imaging, tract by nuclear
e.g., spin
MAGNETIC RESONANCE IMAGING SYSTEM
4719406
Masao Jimbo, Yukio Nanjyo, Ootawara, assigned to Kabushiki Kaisha Toshiba
PHANTOM FOR PERFORMANCE EVALUATION OF A NUCLEAR MAGNETIC RESONANCE SCANNER Daniel J Schaefer, Robert General Electric Company
Newman
assigned
to
There is provided a phantom for measuring a performance parameter of a nuclear magnetic resonance scanner capable of acquiring NMR data from a study object. The phantom is made up of a housing composed of a substantially nonNMR-active material, and positionable in use within a radio-frequency coil forming part of an NMR scanner. The phantom further includes a first medium disposed within the housing to load the radio frequency coil in a manner similar to that of a patient. The NMR properties of the medium are further selected such that an NMR signal, if any, produced by the medium occurs at a time other than when a performance parameter of said NMR scanner is measured. In the preferred embodiment, the phantom comprises two concentrically disposed cylinders of different diameters and a pair of end plates fastened to opposite ends of the cylinders. The first medium is disposed within the volume defined between the side walls of the cylinders and the end plates. A second medium is disposed within the volume defined within the innermost cylinder and generates the NMR test signals.
4719423 NMR IMAGING OF MATERIALS FOR TRANSPORT PROPERTIES Harold Vinegar, William Shell Oil Company
4719424
Rothwell
assigned
to
NMR imaging methods are provided for determining spatial diffusion coefficients, formation resistivity factors, mean pore size, and permeability of a porous material. The imaging methods employ a constant magnetic field and two images are obtained for the material, one with a non-imaging gradient and one without a non-imaging gradient. These images are combined to produce diffusion coefficients.
Japan
An MRI system includes an MR signal acquisition section, an imaging processing section, a control signal generating section, and a control section. The MR signal acquisition section excites an MR phenomenon in a portion including a selected slice of an object to be examined, and detects MR signals generated by the MR phenomenon. The imaging processing section processes the MR signals to form an image based on MR data in the selected slice of the object. The control signal generating section generates a control signal for acquiring the MR signals in response to movement of the object. The control section controls the MR excitation operation and the MR signal acquisition operation of the MR signal acquisition section in accordance with the control signal.
4719425 NMR IMAGING METHOD APPARATUS
AND
Kamil V Ettinger, Aberdeen, United Kingdom assigned to Scientific Innovations Inc A method and apparatus for imaging the concentration of paramagnetic species inside a sample is disclosed wherein a sample is placed inside an NMR imager and an additional microwave field is introduced. A microwave field is chosen in such a way that there is a simultaneous resonance of nuclear spins (protons) and eiectrons in the same main magnetic field. The microwave signal is modulated which provides a modulation transfer to the intensity of the NMR signal. The modulation is extracted from the NMR signal to produce an image representative of the local electron spin resonance (ESR) and thereby the concentration of paramagnetic species in the sample. In addition, electrical activity of the brain can be detected and measured by measuring the broadening of the width of NMR spectral lines. A discharging neuron in the brain introduces an inhomogeneity in the magnetic field which reveals itself as a broadening of resonance lines which can be measured to determine the neuron discharge current flux.
New Patents
suitable for enhancing of the gastrointestinal tomography.
contrast in imaging, tract by nuclear
e.g., spin
MAGNETIC RESONANCE IMAGING SYSTEM
4719406
Masao Jimbo, Yukio Nanjyo, Ootawara, assigned to Kabushiki Kaisha Toshiba
PHANTOM FOR PERFORMANCE EVALUATION OF A NUCLEAR MAGNETIC RESONANCE SCANNER Daniel J Schaefer, Robert General Electric Company
Newman
assigned
to
There is provided a phantom for measuring a performance parameter of a nuclear magnetic resonance scanner capable of acquiring NMR data from a study object. The phantom is made up of a housing composed of a substantially nonNMR-active material, and positionable in use within a radio-frequency coil forming part of an NMR scanner. The phantom further includes a first medium disposed within the housing to load the radio frequency coil in a manner similar to that of a patient. The NMR properties of the medium are further selected such that an NMR signal, if any, produced by the medium occurs at a time other than when a performance parameter of said NMR scanner is measured. In the preferred embodiment, the phantom comprises two concentrically disposed cylinders of different diameters and a pair of end plates fastened to opposite ends of the cylinders. The first medium is disposed within the volume defined between the side walls of the cylinders and the end plates. A second medium is disposed within the volume defined within the innermost cylinder and generates the NMR test signals.
4719423 NMR IMAGING OF MATERIALS FOR TRANSPORT PROPERTIES Harold Vinegar, William Shell Oil Company
4719424
Rothwell
assigned
to
NMR imaging methods are provided for determining spatial diffusion coefficients, formation resistivity factors, mean pore size, and permeability of a porous material. The imaging methods employ a constant magnetic field and two images are obtained for the material, one with a non-imaging gradient and one without a non-imaging gradient. These images are combined to produce diffusion coefficients.
Japan
An MRI system includes an MR signal acquisition section, an imaging processing section, a control signal generating section, and a control section. The MR signal acquisition section excites an MR phenomenon in a portion including a selected slice of an object to be examined, and detects MR signals generated by the MR phenomenon. The imaging processing section processes the MR signals to form an image based on MR data in the selected slice of the object. The control signal generating section generates a control signal for acquiring the MR signals in response to movement of the object. The control section controls the MR excitation operation and the MR signal acquisition operation of the MR signal acquisition section in accordance with the control signal.
4719425 NMR IMAGING METHOD APPARATUS
AND
Kamil V Ettinger, Aberdeen, United Kingdom assigned to Scientific Innovations Inc A method and apparatus for imaging the concentration of paramagnetic species inside a sample is disclosed wherein a sample is placed inside an NMR imager and an additional microwave field is introduced. A microwave field is chosen in such a way that there is a simultaneous resonance of nuclear spins (protons) and eiectrons in the same main magnetic field. The microwave signal is modulated which provides a modulation transfer to the intensity of the NMR signal. The modulation is extracted from the NMR signal to produce an image representative of the local electron spin resonance (ESR) and thereby the concentration of paramagnetic species in the sample. In addition, electrical activity of the brain can be detected and measured by measuring the broadening of the width of NMR spectral lines. A discharging neuron in the brain introduces an inhomogeneity in the magnetic field which reveals itself as a broadening of resonance lines which can be measured to determine the neuron discharge current flux.