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5315997 Method of Magnetic resonance imaging using diamagnetic contrast
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New Patents
region which is adapted to arch over the head of the patient. A second current path supplies current to the first current path. The second current path lies in a second plane which is substantially perpendicular to the first plane. The coil is suitable for use in a coupled resonator system.
A method of magnetic resonance imaging (MRI) is disclosed which employs a diamagnetic contrast agent comprising gas-carrying, microparticles, which are preferably microspheres consisting of minute gas bubbles encapsulated by stabilized biocompatible material. The MRI is carried out to produce a shortened T2* effect. The method is especially useful in imaging the vascular system as in angiography or venography.
5315276 COMPACT SUPERCONDUCTING MAGNET FOR MAGNETIC RESONANCE IMAGING F Russell Huson, Sergio Pissanetzky, John D Larson assigned to Hewlett Packard Company A C-shaped superconducting magnet for use in magnetic resonance imaging (MRI) equipment is disclosed. The magnet includes flux concentrators on opposing sides of the gap, for generating a vertical field therein; the flux concentrators include a plurality of coils, for carrying current in opposing directions, so as to generate an inwardly directed field to compensate for the gap. Injection correctors, each consisting of a horizontal coil, are disposed adjacent the flux concentrators. A flux return body, for example a superconducting solenoid or an iron yoke, provides a return path on the opposite side of the magnet from the gap. Flux deflectors guide return flux in a curved path from the flux return body to the injection correctors. The flux deflectors are constructed to include a superconducting coil which is wound about varying chords (or the full diameter) thereof, so that the induced flux is greater nearer the outside of the flux deflector, compensating for the tendency of the flux to crowd along the inner portion of the curved path. The return flux is thus provided to the injection correctors with sufficient uniformity to be corrected thereby.
5315997 METHOD OF MAGNETIC RESONANCE IMAGING USING DIAMAGNETIC CONTRAST Kenneth J Widder, James L Barnhart assigned to Molecular Biosystems Inc
5316756 NMR IMAGING USING PARAMAGNETIC CHELATES HAVING HYDROXYALKYL SUBSTITUTED AMIDE GROUPS Hein Gries, Franz-Josef Renneke, HannsJoachim Weinmann, Berlin, Federal Republic Of Germany assigned to Schering Aktiengesellschaft Compounds of the general formula I: See Patent for Chemical Structure (I) Rl signifies a COOX group or the group See Patent for Chemical Structure R2 and R3 are the same or different and signify a hydrogen atom, a lower straight- or branched-chain, hydrocarbon radical, a phenyl or benzyl group or either R2 or R3 signifies the group See Patent for Chemical Structure or R2 or R3 together signify a trimethylene or tetramethylene radical, R4 represents a straight- or branched-chain mono- or poly-hydroxyalkyl radical, R5 represents a hydrocarbon atom, a lower straight- or branched-chain, optionally mono- or poly-hydroxylated, hydrocarbon radical, Q signifies an oxygen or sulfur atom or the group See Patent for Chemical Structure wherein j signifies the numbers 1 to 4 and Rx signifies a hydrogen atom, a lower alkoxy group with 1 to 4 carbon atoms, a COOX group, or if j) 1, also the group See Patent for Chemical Structure wherein k and m are the same or different and represent the numbers 0 or 2, 1 signifies the numbers 1 or 2 and n and w are the same or different and signify the numbers 0 or 1, wherein n and w can only represent the number 1, if k and m signify the number 2, and X represents hydrogen atoms and/or metal ion equivalents, and their salts with physiologically harmless organic bases, are valuable complexing agents, complexes and complex salts for NMR imaging.
New Patents
region which is adapted to arch over the head of the patient. A second current path supplies current to the first current path. The second current path lies in a second plane which is substantially perpendicular to the first plane. The coil is suitable for use in a coupled resonator system.
A method of magnetic resonance imaging (MRI) is disclosed which employs a diamagnetic contrast agent comprising gas-carrying, microparticles, which are preferably microspheres consisting of minute gas bubbles encapsulated by stabilized biocompatible material. The MRI is carried out to produce a shortened T2* effect. The method is especially useful in imaging the vascular system as in angiography or venography.
5315276 COMPACT SUPERCONDUCTING MAGNET FOR MAGNETIC RESONANCE IMAGING F Russell Huson, Sergio Pissanetzky, John D Larson assigned to Hewlett Packard Company A C-shaped superconducting magnet for use in magnetic resonance imaging (MRI) equipment is disclosed. The magnet includes flux concentrators on opposing sides of the gap, for generating a vertical field therein; the flux concentrators include a plurality of coils, for carrying current in opposing directions, so as to generate an inwardly directed field to compensate for the gap. Injection correctors, each consisting of a horizontal coil, are disposed adjacent the flux concentrators. A flux return body, for example a superconducting solenoid or an iron yoke, provides a return path on the opposite side of the magnet from the gap. Flux deflectors guide return flux in a curved path from the flux return body to the injection correctors. The flux deflectors are constructed to include a superconducting coil which is wound about varying chords (or the full diameter) thereof, so that the induced flux is greater nearer the outside of the flux deflector, compensating for the tendency of the flux to crowd along the inner portion of the curved path. The return flux is thus provided to the injection correctors with sufficient uniformity to be corrected thereby.
5315997 METHOD OF MAGNETIC RESONANCE IMAGING USING DIAMAGNETIC CONTRAST Kenneth J Widder, James L Barnhart assigned to Molecular Biosystems Inc
5316756 NMR IMAGING USING PARAMAGNETIC CHELATES HAVING HYDROXYALKYL SUBSTITUTED AMIDE GROUPS Hein Gries, Franz-Josef Renneke, HannsJoachim Weinmann, Berlin, Federal Republic Of Germany assigned to Schering Aktiengesellschaft Compounds of the general formula I: See Patent for Chemical Structure (I) Rl signifies a COOX group or the group See Patent for Chemical Structure R2 and R3 are the same or different and signify a hydrogen atom, a lower straight- or branched-chain, hydrocarbon radical, a phenyl or benzyl group or either R2 or R3 signifies the group See Patent for Chemical Structure or R2 or R3 together signify a trimethylene or tetramethylene radical, R4 represents a straight- or branched-chain mono- or poly-hydroxyalkyl radical, R5 represents a hydrocarbon atom, a lower straight- or branched-chain, optionally mono- or poly-hydroxylated, hydrocarbon radical, Q signifies an oxygen or sulfur atom or the group See Patent for Chemical Structure wherein j signifies the numbers 1 to 4 and Rx signifies a hydrogen atom, a lower alkoxy group with 1 to 4 carbon atoms, a COOX group, or if j) 1, also the group See Patent for Chemical Structure wherein k and m are the same or different and represent the numbers 0 or 2, 1 signifies the numbers 1 or 2 and n and w are the same or different and signify the numbers 0 or 1, wherein n and w can only represent the number 1, if k and m signify the number 2, and X represents hydrogen atoms and/or metal ion equivalents, and their salts with physiologically harmless organic bases, are valuable complexing agents, complexes and complex salts for NMR imaging.