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4570119 Method for visualization of in-plane fluid flow by proton NMR imaging
New Patents
IV
4567893 METHOD OF ELIMINATING BREATHING ARTIFACTS IN NMR IMAGING Hal C Charles, Gary H Glover assigned to General Electric Company A method for eliminating or reducing breathing artifacts due to motion-induced phase 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, the breathing cycle is determined by monitoring the integrated spin-echo signal magnitude spectrum as a function of time.
In a apparatus for examining an object by nuclear magnetic resonance to produce images of cross-sectional slices of the object, it necessarily requires to have a wait time so as to repeat the applications of the RF pulses toward a plurality of such slices during one examination cycle. A plurality of coil pairs is arranged along the longitudinal axis of the object, and each pair is selectively energized so as to apply to the plurality of slices one of a plurality of gradient fields in conjunction with the steady magnetic field. A plurality of nuclear magnetic resonance signals may be obtained from a plurality of slices during one examination cycle.
4570119 METHOD FOR VISUALIZATION OF IN-PLANE FLUID FLOW BY PROTON NMR IMAGING
4567894 HYDRAULICALLY OPERATED, MOBILE PATIENT TRANSPORT TABLE USEFUL WITH A MAGNETIC RESONANCE SCANNER Charles Bergman assigned to General Electric Company A hydraulically operated, mobile patient transport table useful with a magnetic resonance scanner, which includes a magnet for producing a polarizing magnetic field, employs a hydraulic motor disposed at the base of the magnet and a hydraulic pump disposed at the base of the table. The hydraulic motor and pump are operatively coupled to enable transfer of energy from the motor to the pump without use of hydraulic connections therebetween. In the preferred embodiment, the coupling is implemented with a coneshaped coupling member attached to the output of the motor and a complementarily-shaped coupling member attached to the input shaft of the pump which frictionally engages the coneshaped member.
4568880 DIAGNOSTIC APPARATUS FOR UTILIZING NUCLEAR MAGNETIC RESONANCE Hirosh Sugimoto, Tochigi, Japan assigned to Tokyo Shibaura Denki Kabushiki Kaisha
Felix W Wehrli, James MacFall General Electric Company
assigned to
A method for visualizing in-plane flow utilizing an NMR pulse sequence to produce a plurality of odd and even spin-echo signals occurring respectively at echo delay times, TE, of 2 tau, 6 tau, 10 tau, etc., and 4 tau, 8 tau, 12 tau, etc. In the preferred embodiment, a fictitious spin-echo amplitude is calculated from the odd and even spin-echo signals at an echo delay time TE = 0, for example. The calculated values for the odd spin-echo signals are lower than those calculated for the even spin-echo signals due to incomplete rephasing of the odd spin-echo signals in the presence of a read-out magnetic field gradient and flow. Subtraction of the calculated image pixel value of the odd spin-echo signals from the calculated pixel values of the even spin-echo signals results in a difference image which highlights the flowing nuclear spins. The image pixels due to stationary nuclear spins experience exact cancellation.
4570120 N.M.R. IMAGING Sukumar, Subramaniam Hall, Laurance Vancouver, Canada assigned to The University of British Columbia A method of obtaining an N.M.R. image of a specimen slice in the a-b plane is provided. The method comprises tipping the magnetization vector by an angle other than 180 degrees. The magnetization is then repeatedly reversed 180
IV
4567893 METHOD OF ELIMINATING BREATHING ARTIFACTS IN NMR IMAGING Hal C Charles, Gary H Glover assigned to General Electric Company A method for eliminating or reducing breathing artifacts due to motion-induced phase 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, the breathing cycle is determined by monitoring the integrated spin-echo signal magnitude spectrum as a function of time.
In a apparatus for examining an object by nuclear magnetic resonance to produce images of cross-sectional slices of the object, it necessarily requires to have a wait time so as to repeat the applications of the RF pulses toward a plurality of such slices during one examination cycle. A plurality of coil pairs is arranged along the longitudinal axis of the object, and each pair is selectively energized so as to apply to the plurality of slices one of a plurality of gradient fields in conjunction with the steady magnetic field. A plurality of nuclear magnetic resonance signals may be obtained from a plurality of slices during one examination cycle.
4570119 METHOD FOR VISUALIZATION OF IN-PLANE FLUID FLOW BY PROTON NMR IMAGING
4567894 HYDRAULICALLY OPERATED, MOBILE PATIENT TRANSPORT TABLE USEFUL WITH A MAGNETIC RESONANCE SCANNER Charles Bergman assigned to General Electric Company A hydraulically operated, mobile patient transport table useful with a magnetic resonance scanner, which includes a magnet for producing a polarizing magnetic field, employs a hydraulic motor disposed at the base of the magnet and a hydraulic pump disposed at the base of the table. The hydraulic motor and pump are operatively coupled to enable transfer of energy from the motor to the pump without use of hydraulic connections therebetween. In the preferred embodiment, the coupling is implemented with a coneshaped coupling member attached to the output of the motor and a complementarily-shaped coupling member attached to the input shaft of the pump which frictionally engages the coneshaped member.
4568880 DIAGNOSTIC APPARATUS FOR UTILIZING NUCLEAR MAGNETIC RESONANCE Hirosh Sugimoto, Tochigi, Japan assigned to Tokyo Shibaura Denki Kabushiki Kaisha
Felix W Wehrli, James MacFall General Electric Company
assigned to
A method for visualizing in-plane flow utilizing an NMR pulse sequence to produce a plurality of odd and even spin-echo signals occurring respectively at echo delay times, TE, of 2 tau, 6 tau, 10 tau, etc., and 4 tau, 8 tau, 12 tau, etc. In the preferred embodiment, a fictitious spin-echo amplitude is calculated from the odd and even spin-echo signals at an echo delay time TE = 0, for example. The calculated values for the odd spin-echo signals are lower than those calculated for the even spin-echo signals due to incomplete rephasing of the odd spin-echo signals in the presence of a read-out magnetic field gradient and flow. Subtraction of the calculated image pixel value of the odd spin-echo signals from the calculated pixel values of the even spin-echo signals results in a difference image which highlights the flowing nuclear spins. The image pixels due to stationary nuclear spins experience exact cancellation.
4570120 N.M.R. IMAGING Sukumar, Subramaniam Hall, Laurance Vancouver, Canada assigned to The University of British Columbia A method of obtaining an N.M.R. image of a specimen slice in the a-b plane is provided. The method comprises tipping the magnetization vector by an angle other than 180 degrees. The magnetization is then repeatedly reversed 180