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5196795 Method for selective excitation of NMR signals
New Patents
5194811 RADIO FREQUENCY VOLUME RESONATOR FOR NUCLEAR MAGNETIC RESONANCE Joseph Murphy-Boesch, Ravi Srinivasan signed to Fox Chase
as-
A radio frequency volume resonator mounted on a dielectric support can be operated in quadrature at one or more NMR frequencies. The resonator consists of four axially distributed high frequency ring current paths on the dielectric support. At least fbur high frequency current paths interconnect each pair of adjacent ring paths. The ring segments with interconnecting segments form loops. At least one discrete capacitor is placed in each loop.
5194825 PROTECTIVE CIRCUIT FOR THE INPUT TRANSISTOR OF A RECEPTION AMPLIFIER IN NUCLEAFL MAGNETIC RESONANCE SYSTEMS Klau Zametzer, Markus Vester, Federal Republic 0f Germany Siemens Aktiengesellschaft
Forchheim, assigned to
A reception amplifie:r in a nuclear magnetic resonance system includes an input transistor. The base of the input transistor is connected to a protective circuit. The protective circuit shifts the voltage at the base-emitter path of the input transistor into the inhibit range only during a high-frequency transmission pulse. The voltage is produced by rectification of a fraction of the high-frequency transmission pulse. The protective circuit of the reception pre-amplifier prevents the input transistor from being gradually destroyed by an excessive base current during the transmission when voltage peaks are provided at the input.
XLVI
aging for determining velocity of a plurality of regions at a plurality of frames during a period of interest such as the cardiac cycle. A region of interest is tracked from frame to frame and based on a known last position and the velocity at the known position. Strain and rotation are determined from the changes in velocity along selected axes.
5196348 PERFLUORO-CROWN ETHERS IN FLUORINE MAGNETIC RESONANCE SPECTROSCOPY OF BIOPSIED TISSUE Frank Schweighardt, Joseph A Rubertone signed to Air Products and Chemicals Inc
as-
A method is disclosed for nuclear magnetic resonance spectroscopy wherein the improvement is the use of perfluoro 15-crown-5 ether which has 20 magnetically similar fluorine providing a superior signal to noise ratio with resultant enhanced diagnostic resolution.
5196795 METHOD FOR SELECTIVE EXCITATION OF NMR SIGNALS Geoffrey Bodenhausen, Lyndon Emsley, Switzerland assigned to Spectrospin AG
Pully,
The use of 270 degrees Gaussian pulses instead of the selective 90 degrees pulses usual heretofore makes it possible, for many NMR experiments, to achieve a frequency-selective excitation of samples which is largely free from phase errors and which, consequently, does away in many cases with the need for rephasing measures which heretofore were necessary as a rule.
5196797 51!95525 NONINVASIVIE MYOCARDIAL MOTION ANALYSIS USING PHASE CONTIRAST MRI MAPS OF MYOCARDIAL VELOCITY Norbert
Pelt
Motion and deformation is assessed and imaged using phase contrast magnetic resonance im-
METHOD OF CORRECTING AN ASYMMETRY IN AN NMR RADIO FREQUENCY COIL AND AN IMPROVED RADIO FREQUENCY COIL HAVING N-FOLD SYMMETRY AND REDUCED EDDYCURRENT James S Tropp MRI Inc
assigned
to Toshiba
America
5194811 RADIO FREQUENCY VOLUME RESONATOR FOR NUCLEAR MAGNETIC RESONANCE Joseph Murphy-Boesch, Ravi Srinivasan signed to Fox Chase
as-
A radio frequency volume resonator mounted on a dielectric support can be operated in quadrature at one or more NMR frequencies. The resonator consists of four axially distributed high frequency ring current paths on the dielectric support. At least fbur high frequency current paths interconnect each pair of adjacent ring paths. The ring segments with interconnecting segments form loops. At least one discrete capacitor is placed in each loop.
5194825 PROTECTIVE CIRCUIT FOR THE INPUT TRANSISTOR OF A RECEPTION AMPLIFIER IN NUCLEAFL MAGNETIC RESONANCE SYSTEMS Klau Zametzer, Markus Vester, Federal Republic 0f Germany Siemens Aktiengesellschaft
Forchheim, assigned to
A reception amplifie:r in a nuclear magnetic resonance system includes an input transistor. The base of the input transistor is connected to a protective circuit. The protective circuit shifts the voltage at the base-emitter path of the input transistor into the inhibit range only during a high-frequency transmission pulse. The voltage is produced by rectification of a fraction of the high-frequency transmission pulse. The protective circuit of the reception pre-amplifier prevents the input transistor from being gradually destroyed by an excessive base current during the transmission when voltage peaks are provided at the input.
XLVI
aging for determining velocity of a plurality of regions at a plurality of frames during a period of interest such as the cardiac cycle. A region of interest is tracked from frame to frame and based on a known last position and the velocity at the known position. Strain and rotation are determined from the changes in velocity along selected axes.
5196348 PERFLUORO-CROWN ETHERS IN FLUORINE MAGNETIC RESONANCE SPECTROSCOPY OF BIOPSIED TISSUE Frank Schweighardt, Joseph A Rubertone signed to Air Products and Chemicals Inc
as-
A method is disclosed for nuclear magnetic resonance spectroscopy wherein the improvement is the use of perfluoro 15-crown-5 ether which has 20 magnetically similar fluorine providing a superior signal to noise ratio with resultant enhanced diagnostic resolution.
5196795 METHOD FOR SELECTIVE EXCITATION OF NMR SIGNALS Geoffrey Bodenhausen, Lyndon Emsley, Switzerland assigned to Spectrospin AG
Pully,
The use of 270 degrees Gaussian pulses instead of the selective 90 degrees pulses usual heretofore makes it possible, for many NMR experiments, to achieve a frequency-selective excitation of samples which is largely free from phase errors and which, consequently, does away in many cases with the need for rephasing measures which heretofore were necessary as a rule.
5196797 51!95525 NONINVASIVIE MYOCARDIAL MOTION ANALYSIS USING PHASE CONTIRAST MRI MAPS OF MYOCARDIAL VELOCITY Norbert
Pelt
Motion and deformation is assessed and imaged using phase contrast magnetic resonance im-
METHOD OF CORRECTING AN ASYMMETRY IN AN NMR RADIO FREQUENCY COIL AND AN IMPROVED RADIO FREQUENCY COIL HAVING N-FOLD SYMMETRY AND REDUCED EDDYCURRENT James S Tropp MRI Inc
assigned
to Toshiba
America