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4906932 NMR spectroscopy and NMR imaging
New Patents
X
4905316
4906931
MAGNETIC FIELD GENERATING SYSTEM FOR MAGNETIC RESONANCE IMAGING SYSTEM
APPARATUS AND METHOD FOR THE EXAMINATION OF PROPERTIES OF AN OBJECT
Kazuy Okamoto, Yokohama, Japan assigned to Kabushiki Kaisha Toshiba
Raimo Sepponen, Helsinki, Finland assigned to Instrumentarium Corp
A magnetic field generating system for use in a magnetic resonance imaging system to apply a static magnetic field and additionally a gradient field and a high frequency field to a body under examination in order to excite a magnetic resonance and to collect magnetic resonance data about the magnetic resonance. The field generating system comprises a superconducting including magnet a superconducting coil for generating the static magnetic field, a gradient coil for generating the gradient field and a high frequency coil for generating the high frequency field. At least part of the superconducting magnet is made of a metal member, and at least part of the metal member is interposed between the superconducting coil the gradient coil provided with non-conductive sections for impeding an eddy current.
The invention relates to an apparatus for the examination of an object by the application of methods, such as magnetic imaging, based on nuclear magnetic resonance. The apparatus includes means for creating a first magnetic field over an object to be examined as well as means for creating and registering a nuclear magnetic resonance signal. The apparatus further includes means for creating a second magnetic field in a manner that the formation of nuclear magnetization occurring between successive excitation and signal pick-up events is at least partially effected while the second magnetic field is switched on.
4906932 NMR SPECTROSCOPY IMAGING
AND NMR
Roger J Ordidge, Nottingham, United Kingdom assigned to National Research Development Corporation
4905699 METHOD
AND APPARATUS NMR IMAGING
Koich Sano, Tetsuo Koizumi, Sagamihara, Hitachi Ltd
FOR
Yokoyama, Hideaki Japan assigned to
In order to permit the detection of a respiratory motion and an imaging synchronized with the respiration by an NMR imaging apparatus itself without any special hardware, a sequence for detecting the respiratory motion is repeated for a short time immediately before the measurement of an image signal to detect the position and speed of the respiratory motion, and a desired image signal is measured in synchronism with Alternatively, the the detected position. respiratory motion is detected immediately after the measurement of an image signal, and the measured image signal is corrected in accordance with the detected amount to obtain a desired image signal synchronized with the respiration.
Undesired signals are eliminated using a shaped RF pulse comprising a region of random frequency components and a region of zero components to effectively eliminate signals from areas volumes or frequency bands which are not required.
4906933 QUADRATURE
SURFACE
COIL
Hanan Keren, Kfar Saba, Israel assigned to Elscint Ltd A surface coil arrangement for magnetic resonance data acquisition comprising a first coil designed to generate a circular magnetic field and a second coil designed to generate a linear magnetic field in quadrature to said circular magnetic field with said first and second coils positioned relative to one another to provide circular polarization.
X
4905316
4906931
MAGNETIC FIELD GENERATING SYSTEM FOR MAGNETIC RESONANCE IMAGING SYSTEM
APPARATUS AND METHOD FOR THE EXAMINATION OF PROPERTIES OF AN OBJECT
Kazuy Okamoto, Yokohama, Japan assigned to Kabushiki Kaisha Toshiba
Raimo Sepponen, Helsinki, Finland assigned to Instrumentarium Corp
A magnetic field generating system for use in a magnetic resonance imaging system to apply a static magnetic field and additionally a gradient field and a high frequency field to a body under examination in order to excite a magnetic resonance and to collect magnetic resonance data about the magnetic resonance. The field generating system comprises a superconducting including magnet a superconducting coil for generating the static magnetic field, a gradient coil for generating the gradient field and a high frequency coil for generating the high frequency field. At least part of the superconducting magnet is made of a metal member, and at least part of the metal member is interposed between the superconducting coil the gradient coil provided with non-conductive sections for impeding an eddy current.
The invention relates to an apparatus for the examination of an object by the application of methods, such as magnetic imaging, based on nuclear magnetic resonance. The apparatus includes means for creating a first magnetic field over an object to be examined as well as means for creating and registering a nuclear magnetic resonance signal. The apparatus further includes means for creating a second magnetic field in a manner that the formation of nuclear magnetization occurring between successive excitation and signal pick-up events is at least partially effected while the second magnetic field is switched on.
4906932 NMR SPECTROSCOPY IMAGING
AND NMR
Roger J Ordidge, Nottingham, United Kingdom assigned to National Research Development Corporation
4905699 METHOD
AND APPARATUS NMR IMAGING
Koich Sano, Tetsuo Koizumi, Sagamihara, Hitachi Ltd
FOR
Yokoyama, Hideaki Japan assigned to
In order to permit the detection of a respiratory motion and an imaging synchronized with the respiration by an NMR imaging apparatus itself without any special hardware, a sequence for detecting the respiratory motion is repeated for a short time immediately before the measurement of an image signal to detect the position and speed of the respiratory motion, and a desired image signal is measured in synchronism with Alternatively, the the detected position. respiratory motion is detected immediately after the measurement of an image signal, and the measured image signal is corrected in accordance with the detected amount to obtain a desired image signal synchronized with the respiration.
Undesired signals are eliminated using a shaped RF pulse comprising a region of random frequency components and a region of zero components to effectively eliminate signals from areas volumes or frequency bands which are not required.
4906933 QUADRATURE
SURFACE
COIL
Hanan Keren, Kfar Saba, Israel assigned to Elscint Ltd A surface coil arrangement for magnetic resonance data acquisition comprising a first coil designed to generate a circular magnetic field and a second coil designed to generate a linear magnetic field in quadrature to said circular magnetic field with said first and second coils positioned relative to one another to provide circular polarization.