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5408181 NMR system for measuring polymer properties
New Patents
NMR image data is acquired with velocity encoding gradients applied and both a phase difference image array and a complex difference image array are produced. AF c flow image is produced from the complex difference image array after it is corrected for spin saturation effects and calibrated using information derived from the phase difference image array. Total blood flow through vessels can be measured from the flow image.
5408181 NMR SYSTEM FOR MEASURING POLYMER PROPERTIES Dechene Ronald L; Smith Thomas; Day David R; Tanzer Christian I; Marino Scott; Tache Ronald; Roy Ajoy Boxford, MA, UNITED STATES Assigned to Auburn International Inc A pulsed mnr analysis system for polymers materials extracted from industrial processes at a mobility enhancing temperature (at or above glass transition temperature for amorphous crystalline transition polymers, at the temperature for crystalline and semi-crystalline polymers). The sample is measured via rmu techniques and results correlated to viscosity and melt index or melt flow (which are related to average molecular weights). The mnr system (in or out of resonance) includes: sample throughput system (P, LI, Vl, V2) and user system controls (104) to ablish digitized free induction decay curves (C), from which components functions are determined using linear or non-linear regression techniques to correlate the curve components to the target nuclei and to flow rates in plastics. Substantial improvement of correlation of nmr derived constants and equations of a free induction decay curve with the foregoing polymer properties is obtained via (1) conducting the nmr process at a mobility enhancing temperature (normally elevated compared to the industrial process temperature of the industrial process) and (2) holding temperature substantially constant at such elevated temperature.
5409003 PROBES FOR USE IN IMAGING Young Ian R Marlborough, UNITED KINGDOM Assigned to Picker International Inc
XXIX
A probe (3) for use in in vivo imaging of a microscopic internal region (1) of a patient’s body using magnetic resonance techniques incorporates a member (7) having a surface having a pattern of projections (9) formed thereon. In use the surface contacts the surface of the region to trap between the projections molecules in the region, thereby to restrict diffusion of the molecules and so improve resolution of the image obtained.
5410248 METHOD FOR THE SIMULTANEOUS DETECTION OF VELOCITY AND ACCELERATION DISTRIBUTION IN MOVING FLUIDS Dumoulin Charles L Ballston Lake, NY, UNITED STATES Assigned to General Electric Company A motion imaging method uses magnetic resonance to detect velocity, and an acceleration distribution within moving materials in a subject. Velocity encoding is performed by computing differences of data obtained with modulated motion-encoding magnetic field gradient pulses. Distributions of acceleration are measured responsive to a motion sensitive phaseencoding gradient pulse.
5410249 METHOD AND APPARATUS FOR MAGNETIC RESONANCE IMAGING Van Yperen Gerrit H; Van Der Meulen Peter Eindhoven, NETHERLANDS Assigned to U S Philips Corporation In a magnetic resonance imaging method multiple refocusing RF-pulses (22-26) are applied and spin-echo signals (62-66) obtained following an excitation RF-pulse (21). Imperfections in the applied RF-pulses (21-26) and the switched gradient magnetic fields (3136, 42-46, 51-56) cause deviations from the desired phases of the nuclear dipole moments which appear as artefacts or ghosts in a resulting image. By a suitable arrangement of the application of the phase encoding values (242248; 342-348) imposed during the measurements and/or the addition of supplemental measurements, the effects of the phase deviations
NMR image data is acquired with velocity encoding gradients applied and both a phase difference image array and a complex difference image array are produced. AF c flow image is produced from the complex difference image array after it is corrected for spin saturation effects and calibrated using information derived from the phase difference image array. Total blood flow through vessels can be measured from the flow image.
5408181 NMR SYSTEM FOR MEASURING POLYMER PROPERTIES Dechene Ronald L; Smith Thomas; Day David R; Tanzer Christian I; Marino Scott; Tache Ronald; Roy Ajoy Boxford, MA, UNITED STATES Assigned to Auburn International Inc A pulsed mnr analysis system for polymers materials extracted from industrial processes at a mobility enhancing temperature (at or above glass transition temperature for amorphous crystalline transition polymers, at the temperature for crystalline and semi-crystalline polymers). The sample is measured via rmu techniques and results correlated to viscosity and melt index or melt flow (which are related to average molecular weights). The mnr system (in or out of resonance) includes: sample throughput system (P, LI, Vl, V2) and user system controls (104) to ablish digitized free induction decay curves (C), from which components functions are determined using linear or non-linear regression techniques to correlate the curve components to the target nuclei and to flow rates in plastics. Substantial improvement of correlation of nmr derived constants and equations of a free induction decay curve with the foregoing polymer properties is obtained via (1) conducting the nmr process at a mobility enhancing temperature (normally elevated compared to the industrial process temperature of the industrial process) and (2) holding temperature substantially constant at such elevated temperature.
5409003 PROBES FOR USE IN IMAGING Young Ian R Marlborough, UNITED KINGDOM Assigned to Picker International Inc
XXIX
A probe (3) for use in in vivo imaging of a microscopic internal region (1) of a patient’s body using magnetic resonance techniques incorporates a member (7) having a surface having a pattern of projections (9) formed thereon. In use the surface contacts the surface of the region to trap between the projections molecules in the region, thereby to restrict diffusion of the molecules and so improve resolution of the image obtained.
5410248 METHOD FOR THE SIMULTANEOUS DETECTION OF VELOCITY AND ACCELERATION DISTRIBUTION IN MOVING FLUIDS Dumoulin Charles L Ballston Lake, NY, UNITED STATES Assigned to General Electric Company A motion imaging method uses magnetic resonance to detect velocity, and an acceleration distribution within moving materials in a subject. Velocity encoding is performed by computing differences of data obtained with modulated motion-encoding magnetic field gradient pulses. Distributions of acceleration are measured responsive to a motion sensitive phaseencoding gradient pulse.
5410249 METHOD AND APPARATUS FOR MAGNETIC RESONANCE IMAGING Van Yperen Gerrit H; Van Der Meulen Peter Eindhoven, NETHERLANDS Assigned to U S Philips Corporation In a magnetic resonance imaging method multiple refocusing RF-pulses (22-26) are applied and spin-echo signals (62-66) obtained following an excitation RF-pulse (21). Imperfections in the applied RF-pulses (21-26) and the switched gradient magnetic fields (3136, 42-46, 51-56) cause deviations from the desired phases of the nuclear dipole moments which appear as artefacts or ghosts in a resulting image. By a suitable arrangement of the application of the phase encoding values (242248; 342-348) imposed during the measurements and/or the addition of supplemental measurements, the effects of the phase deviations