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4563647 Nuclear magnetic resonance methods and apparatus
II
New Patents
thermography, by one-, two-, or threedimensional reconstruction techniques from chemical shift, relaxation times, (e.g., Tl or T2,) spin-spin couplings and quadrupole couplings for an element of a compound having at least one conformational isomer in an object or animal influenced by a temperature in the object or animal. The methods disclosed are applicable to inanimate and animate solids.
boiled off from the cryostat interior. The cryostat which incorporates the present invention is particularly useful in housing NMR medical diagnostic imaging magnet and coil systems.
4563647 NUCLEAR MAGNETIC RESONANCE METHODS AND APPARATUS
4558425 NMR IMAGING APPARATUS OF CHANGEABLE INSPECTING ZONE SIZE Etsuji Yamamoto, Kensuke Sekihara, Hideki Kohno, Shinji Yamamoto, Hachioji, Japan assigned to Hitachi Ltd In an imaging apparatus using nuclear magnetic resonance which includes apparatus for generating a static magnetic field, a linear gradient magnetic field and a radio frequency magnetic field, respectively, signal detection device for detecting the nuclear magnetic resonant signal from an object to be inspected, a computer for calculating from the detection signal an image and output device for displaying the result of calculation by the computer, the improvement wherein the size of the object to be inspected is detected by use of ultrasonic wave or light beams and a signal indicative of the detected size of the object is applied to the linear gradient magnetic field generation apparatus so as to control the intensity of the linear gradient magnetic field.
Ian R Young, Sunbury Kingdom assigned to L,imited
on Thames, United Picker International
A method of exciting nuclear magnetic resonance at a particular location of a body comprises: exciting first nuclear spins in the body (A, Gx, -G’x, B, Gxd, C, Gy, -G’y, D) so that spins occurring in a first selected region of the body have their spin vectors lying in a first direction and any spins occurring elsewhere in the body have their spin vectors lying in a plane normal to the first direction; dephasing the spins in the body whose vectors lie in said plane (Gyd); and exciting nuclear spins in a second selected region of the body (E, Gz, -G’z) which intersects said first region at said particular location so that the vectors of the resultant spins in said particular location only are aligned in said plane. The method finds particular application in providing data for chemical analysis of material at a particular location of a body. Apparatus for carrying out the method is also described.
4562703
4564017
PLUG TUBE FOR NMR MAGNET CRYOSTAT
METHOD AND APPARATUS FOR RESPIRATION MONITORING WITH AN NMR SCANNER
Russell General
Miller, Thomas E Price Electric Company
assigned
to Gary Glover
assigned
to General
Electric Com-
pany A vent tube which is particularly useful for horizontal cryostat penetration comprises a plurality of conduit sections joined by mating rings which facilitate the incorporation of relatively deep circumferential grooves in the conThermal contact springs, duit sections. preferably in the form of a single strip are disposed in these circumferential grooves so as to provide a means for transfer of thermal energy from the cryostat interior to the exterior either for general refrigeration requirements or for liquefaction of coolant vapor which may have
A method for eliminating or reducing breathing artifacts due to motion-induced phase and amplitude errors in the phase-encoding dimension when using Fourier transform imaging methods, such as spin warp, utilizes a repetition time (TR) which is an odd multiple of one quarter of the breathing cycle. In the preferred embodiment, method and apparatus are provided for determining the breathing cycle by monitoring the integrated spin-echo signal magnitude spectrum as a function of time.
New Patents
thermography, by one-, two-, or threedimensional reconstruction techniques from chemical shift, relaxation times, (e.g., Tl or T2,) spin-spin couplings and quadrupole couplings for an element of a compound having at least one conformational isomer in an object or animal influenced by a temperature in the object or animal. The methods disclosed are applicable to inanimate and animate solids.
boiled off from the cryostat interior. The cryostat which incorporates the present invention is particularly useful in housing NMR medical diagnostic imaging magnet and coil systems.
4563647 NUCLEAR MAGNETIC RESONANCE METHODS AND APPARATUS
4558425 NMR IMAGING APPARATUS OF CHANGEABLE INSPECTING ZONE SIZE Etsuji Yamamoto, Kensuke Sekihara, Hideki Kohno, Shinji Yamamoto, Hachioji, Japan assigned to Hitachi Ltd In an imaging apparatus using nuclear magnetic resonance which includes apparatus for generating a static magnetic field, a linear gradient magnetic field and a radio frequency magnetic field, respectively, signal detection device for detecting the nuclear magnetic resonant signal from an object to be inspected, a computer for calculating from the detection signal an image and output device for displaying the result of calculation by the computer, the improvement wherein the size of the object to be inspected is detected by use of ultrasonic wave or light beams and a signal indicative of the detected size of the object is applied to the linear gradient magnetic field generation apparatus so as to control the intensity of the linear gradient magnetic field.
Ian R Young, Sunbury Kingdom assigned to L,imited
on Thames, United Picker International
A method of exciting nuclear magnetic resonance at a particular location of a body comprises: exciting first nuclear spins in the body (A, Gx, -G’x, B, Gxd, C, Gy, -G’y, D) so that spins occurring in a first selected region of the body have their spin vectors lying in a first direction and any spins occurring elsewhere in the body have their spin vectors lying in a plane normal to the first direction; dephasing the spins in the body whose vectors lie in said plane (Gyd); and exciting nuclear spins in a second selected region of the body (E, Gz, -G’z) which intersects said first region at said particular location so that the vectors of the resultant spins in said particular location only are aligned in said plane. The method finds particular application in providing data for chemical analysis of material at a particular location of a body. Apparatus for carrying out the method is also described.
4562703
4564017
PLUG TUBE FOR NMR MAGNET CRYOSTAT
METHOD AND APPARATUS FOR RESPIRATION MONITORING WITH AN NMR SCANNER
Russell General
Miller, Thomas E Price Electric Company
assigned
to Gary Glover
assigned
to General
Electric Com-
pany A vent tube which is particularly useful for horizontal cryostat penetration comprises a plurality of conduit sections joined by mating rings which facilitate the incorporation of relatively deep circumferential grooves in the conThermal contact springs, duit sections. preferably in the form of a single strip are disposed in these circumferential grooves so as to provide a means for transfer of thermal energy from the cryostat interior to the exterior either for general refrigeration requirements or for liquefaction of coolant vapor which may have
A method for eliminating or reducing breathing artifacts due to motion-induced phase and amplitude errors in the phase-encoding dimension when using Fourier transform imaging methods, such as spin warp, utilizes a repetition time (TR) which is an odd multiple of one quarter of the breathing cycle. In the preferred embodiment, method and apparatus are provided for determining the breathing cycle by monitoring the integrated spin-echo signal magnitude spectrum as a function of time.