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MRI pulse amplifier
New Patents
localization of the output signal is achieved by using gradient magnetic fields and radiofrequency inversion pulses to define slices through a sample from which a signal is obtained. The use of intersecting slices allows the field of view to be reduced to the region of intersection to study a localized volume of interest in the sample. Conventionally, three orthogonal gradient magnetic fields can be defined by energizing successively three gradient magnetic field coils. With the present invention combinations of the gradient magnetic field coils are energized simultaneously to allow the field of view to be more closely conformed to a described volume of interest. This simultaneous energization allows the field of view to be rotated relative to the axes of the coils and/or allows non-orthogonal intersecting slices to be defined to alter the shape of the field of view at the intersection of the slices. Further, more than three slices may be defined to allow polyhedral fields of view to be defined. The invention is applicable to many modern forms of nuclear magnetic resonance spectroscopy.
5374890
V
convey RF signals to the surface coils such that the surface coils operate in both a transmit and receive mode. Regardless whether a single transmitter or a series of transmitters is utilized, control (44) controls the !&nss~t(~ and the gradient control (42) to conduct conventional magnetic resonance imaging sequences in coordination in both subregions.
5374895 NMR/MRI
PULSE AMPLIFIER
Lee Rowland; Brimmer Gerald Yorba Linda, CA, UNITED STATES Assigned to Spectrian Inc An improved Nuclear Magnetic Resonance (NMR)/Magnetic Resonance Imaging (MRI) Pulse Amplifier uses fast acting Radio Frequency (RF) switches with a fixed or programmable attenuator to achieve fast blanking speed, low blanked noise and a low power mode, previously unavailable with existing amplifiers.
SIMULTANEOUS MAGNETIC RESONANCE IMAGING OF MULTIPLE HUMAN ORGANS Zou Xueming; Patrick John; McNally James M Chesterland, OH, UNITED STATES Assigned to Picker International Inc Superconducting magnets (10) of a magnetic resonance imager create static magnetic fields through an examination region (12). Gradient magnetic field coils (30) under control of a gradient magnetic field control (42) generate gradient magnetic fields across the examination region (12), as a whole. A plurality of surface coils (36, 38) receive radio frequency signals from each of two distinct subregions within the examination region (12). The two receiver coils are connected with separate receivers (601, 602) which demodulate the received magnetic resonance signals. The magnetic resonance signals are reconstructed (76) into an image representation (80, 82) of the first and second subregions. In the embodiment of FIGS. 1 and 2, a radio frequency transmitter (40) and a whole body coil (32) generate and manipulate the magnetic resonance signals within the first and second subregions. In the embodiment of FIGS. 3 and 4, a plurality of transmitters (401, 402,. .)
5375597 DIGITAL MAGNETIC SHOCK-MONITORING
RESONANCE METHOD
Howell Jerome; Green Ronald TN, 37421, UNITED STATES
Chattanooga,
A method for monitoring the pH of a patient includes the step of providing a magnetic resonance system having a magnet with a bore configured to receive a portion of a fmger of a patient without receiving a substantially larger portion of the body of the patient. The method proceeds by inserting the finger of the patient into the bore of the magnet and monitoring the pH level of capillary bed tissue in the finger with the magnetic resonance system. Preferably, the system is configured to monitor the spectrum of phosphorus-31 metabolites in the finger and
localization of the output signal is achieved by using gradient magnetic fields and radiofrequency inversion pulses to define slices through a sample from which a signal is obtained. The use of intersecting slices allows the field of view to be reduced to the region of intersection to study a localized volume of interest in the sample. Conventionally, three orthogonal gradient magnetic fields can be defined by energizing successively three gradient magnetic field coils. With the present invention combinations of the gradient magnetic field coils are energized simultaneously to allow the field of view to be more closely conformed to a described volume of interest. This simultaneous energization allows the field of view to be rotated relative to the axes of the coils and/or allows non-orthogonal intersecting slices to be defined to alter the shape of the field of view at the intersection of the slices. Further, more than three slices may be defined to allow polyhedral fields of view to be defined. The invention is applicable to many modern forms of nuclear magnetic resonance spectroscopy.
5374890
V
convey RF signals to the surface coils such that the surface coils operate in both a transmit and receive mode. Regardless whether a single transmitter or a series of transmitters is utilized, control (44) controls the !&nss~t(~ and the gradient control (42) to conduct conventional magnetic resonance imaging sequences in coordination in both subregions.
5374895 NMR/MRI
PULSE AMPLIFIER
Lee Rowland; Brimmer Gerald Yorba Linda, CA, UNITED STATES Assigned to Spectrian Inc An improved Nuclear Magnetic Resonance (NMR)/Magnetic Resonance Imaging (MRI) Pulse Amplifier uses fast acting Radio Frequency (RF) switches with a fixed or programmable attenuator to achieve fast blanking speed, low blanked noise and a low power mode, previously unavailable with existing amplifiers.
SIMULTANEOUS MAGNETIC RESONANCE IMAGING OF MULTIPLE HUMAN ORGANS Zou Xueming; Patrick John; McNally James M Chesterland, OH, UNITED STATES Assigned to Picker International Inc Superconducting magnets (10) of a magnetic resonance imager create static magnetic fields through an examination region (12). Gradient magnetic field coils (30) under control of a gradient magnetic field control (42) generate gradient magnetic fields across the examination region (12), as a whole. A plurality of surface coils (36, 38) receive radio frequency signals from each of two distinct subregions within the examination region (12). The two receiver coils are connected with separate receivers (601, 602) which demodulate the received magnetic resonance signals. The magnetic resonance signals are reconstructed (76) into an image representation (80, 82) of the first and second subregions. In the embodiment of FIGS. 1 and 2, a radio frequency transmitter (40) and a whole body coil (32) generate and manipulate the magnetic resonance signals within the first and second subregions. In the embodiment of FIGS. 3 and 4, a plurality of transmitters (401, 402,. .)
5375597 DIGITAL MAGNETIC SHOCK-MONITORING
RESONANCE METHOD
Howell Jerome; Green Ronald TN, 37421, UNITED STATES
Chattanooga,
A method for monitoring the pH of a patient includes the step of providing a magnetic resonance system having a magnet with a bore configured to receive a portion of a fmger of a patient without receiving a substantially larger portion of the body of the patient. The method proceeds by inserting the finger of the patient into the bore of the magnet and monitoring the pH level of capillary bed tissue in the finger with the magnetic resonance system. Preferably, the system is configured to monitor the spectrum of phosphorus-31 metabolites in the finger and