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4537033 Cryogenic magnet systems
Magnetic Resonance Im0gh.g. Vol. 4 pp. I-IV, Printed in the USA. All rights rexrved.
1986
0730--725X/86 $3.00 + .MI Copyright Q 1986 Perymon Journals Ltd.
NEW PATENTS This Section contains abstracts and, where appropriate, illustrations of recently issued United States patents and published patent applications filed from over 30 countries under the Patent Cooperation Treaty. This information was obtained from recent additions to the Pergamon PATSEARCH@ online database in accordance with interest profiles developed by the Editors. Further information about Pergamon PATSEARCH” can be obtained from Pergamon InfoLine Inc., 1340 Old Chain Bridge Road, McLean, Virginia 22101 U.S.A. Copies of complete patents announced in this Section are available from Pergamon InfoLine Inc. for $8 per copy.
Payment with order is required. Orders outside North America add $2 for air postage. Order by patent number for Pergamon InfoLine only.
4537033 CRYOGENIC
MAGNET
SYSTEMS
Zvi Kamil, Tel Aviv, Israel assigned to Elscint Ltd
magnetic field within the magnet interior is disclosed. The permanent magnet is constructed of material which has essentially linear behavior in the second quadrant of the B-H curve. The invention includes a method of tuning a segmented permanent ring magnet and a method of manufacture for the blocks of magnetic material which make up the magnet. The magnets of the present invention are particularly adapted for use as bias magnets in NMR imaging systems.
1(
Improved cryogenic magnet systems for use in NMR imaging devices comprising an electromagnet immersed in a first tank containing a first liquid gas, the hrst tank located in a container evacuated to a high vacuum, a refrigerating system external to said container, and coupling means for coupling a cold head of the refrigerating system to radiation shielding means surrounding said first tank for lowering the temperature of the shielding means to thereby reduce boil-off of said liquid gas.
4543529 METHOD
Gary Mee, M Robert Willcott assigned to NMR Imaging Inc
4538130
A method of tuning an NMR spectrometer is disclosed that includes the step of locating a specimen in a stationary magnetic field, generating a 90 degrees alternating magnetic field excitation pulse at the Larmor frequency of the selected nuclei of the specimen followed by one or more 180 degrees alternating magnetic field refocusing pulses of preselected duration at fixed time intervals having the same phase relationships using a free-running oscillator that is
TUNABLE SEGMENTED RING MAGNET AND METHOD OF MANUFACTURE Robert L Gluckstern, Ronald F Holsinger, Robert R Lown assigned to Field Effects Inc A segmented
tunable
OF TUNING AN NMR APPARATUS
permanent ring magnet which is to provide a preselected transverse I
1986
0730--725X/86 $3.00 + .MI Copyright Q 1986 Perymon Journals Ltd.
NEW PATENTS This Section contains abstracts and, where appropriate, illustrations of recently issued United States patents and published patent applications filed from over 30 countries under the Patent Cooperation Treaty. This information was obtained from recent additions to the Pergamon PATSEARCH@ online database in accordance with interest profiles developed by the Editors. Further information about Pergamon PATSEARCH” can be obtained from Pergamon InfoLine Inc., 1340 Old Chain Bridge Road, McLean, Virginia 22101 U.S.A. Copies of complete patents announced in this Section are available from Pergamon InfoLine Inc. for $8 per copy.
Payment with order is required. Orders outside North America add $2 for air postage. Order by patent number for Pergamon InfoLine only.
4537033 CRYOGENIC
MAGNET
SYSTEMS
Zvi Kamil, Tel Aviv, Israel assigned to Elscint Ltd
magnetic field within the magnet interior is disclosed. The permanent magnet is constructed of material which has essentially linear behavior in the second quadrant of the B-H curve. The invention includes a method of tuning a segmented permanent ring magnet and a method of manufacture for the blocks of magnetic material which make up the magnet. The magnets of the present invention are particularly adapted for use as bias magnets in NMR imaging systems.
1(
Improved cryogenic magnet systems for use in NMR imaging devices comprising an electromagnet immersed in a first tank containing a first liquid gas, the hrst tank located in a container evacuated to a high vacuum, a refrigerating system external to said container, and coupling means for coupling a cold head of the refrigerating system to radiation shielding means surrounding said first tank for lowering the temperature of the shielding means to thereby reduce boil-off of said liquid gas.
4543529 METHOD
Gary Mee, M Robert Willcott assigned to NMR Imaging Inc
4538130
A method of tuning an NMR spectrometer is disclosed that includes the step of locating a specimen in a stationary magnetic field, generating a 90 degrees alternating magnetic field excitation pulse at the Larmor frequency of the selected nuclei of the specimen followed by one or more 180 degrees alternating magnetic field refocusing pulses of preselected duration at fixed time intervals having the same phase relationships using a free-running oscillator that is
TUNABLE SEGMENTED RING MAGNET AND METHOD OF MANUFACTURE Robert L Gluckstern, Ronald F Holsinger, Robert R Lown assigned to Field Effects Inc A segmented
tunable
OF TUNING AN NMR APPARATUS
permanent ring magnet which is to provide a preselected transverse I