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4972837 Contrast agents for nuclear magnetic resonance imaging
New Patents
4972837 CONTRAST AGENTS FOR NUCLEAR MAGNETIC RESONANCE IMAGING Barry L Engelstad, Robert Brasch, Robert S Hattner, Georg Wesbey, John Huberty assigned to Regents of the University of California A method is provided for obtaining in vivo differentiation of tissues in an animal by nuclear magnetic resonance imaging comprising the steps of introducing into the animal a complex comprising a paramagnetic metal ion and a chelator.
PARAMETRIC IMAGE RECONSTRUCTION USING A HIGH-RESOLUTION, HIGH SIGNAL-TO-NOISE TECHNIQUE E Mark Haacke, Zhi-pei Liang assigned Western Reserve University
to Case
An imaging apparatus and method which provides for reconstruction of images from sampled data with improved resolution, improved signalto-noise, optimal edge detection, and pattern recognition. The apparatus and method are characterized by the use of a priori information (constraints) and a high pass filter on the data to obtain superresolution reconstruction of image data. An object function is approximated by a series of known model functions such as box car and polynomial functions. Solution of the object function depends on a finite number of unknowns whereupon the model parameters can be perfectly resolved to obtain infinite or superresolution. The apparatus and method have parmagnetic application in nuclear ticular resonance imaging as well as other imaging modalities.
4973996 FLOW COMPENSATED NMR FAST PULSE SEQUENCE assigned
A steady-state free precession fast NMR pulse sequence includes a readout gradient waveform which refocuses the transverse magnetization to produce an S- NMR signal during the subsequent pulse sequence. This readout gradient waveform is shaped to null the gradient first moment and to thereby suppress flow and motion artifacts. In an alternative embodiment, crusher pulses employed in the phase encoding or slice select gradients are also flow compensated.
4973907 RF COIL SYSTEM HAVING SEVERAL SURFACE COILS Anthonie H Bergman, hoven, CT, Netherlands Corporation
4973111
Matthew A Bernstein tric Company
V
to General
Elec-
Eddy Boskamp, Eindassigned to U S Philips
An Rf coil system for the detection of MR resonance signals is constructed from a first system of coils for making an overall picture and a second coil system which covers substantially the same area, consists of several coils and for local imaging having a higher resolving power. In particular the latter coils preferably include magnetic resonance sensitive material which become visible on an image formed from detected MR resonance signals for indicating the position of each coil.
4973908 NMR PROBE WITH MULTIPLE ISOLATED COPLANAR SURFACE COILS Paul Bottomley, Christopher to General Electric Company
J Hardy
assigned
An NMR antenna probe has at least one substantially circular surface coil arranged in a plane and a surface coil having substantially a Figure-8 shape, substantially coplanar with the at least one circular surface coil. The Figure-8 coil has a cross-over portion which is located substantially coaxial with the axis of the at least one circular surface coil. The coil corresponding to the least-NMR-sensitive nucleus is circular, while the non-circular coil corresponds to the most-NMR-sensitive nucleus. The circular coil is positioned on the side of the NMR probe closest to the subject to be studied.
4972837 CONTRAST AGENTS FOR NUCLEAR MAGNETIC RESONANCE IMAGING Barry L Engelstad, Robert Brasch, Robert S Hattner, Georg Wesbey, John Huberty assigned to Regents of the University of California A method is provided for obtaining in vivo differentiation of tissues in an animal by nuclear magnetic resonance imaging comprising the steps of introducing into the animal a complex comprising a paramagnetic metal ion and a chelator.
PARAMETRIC IMAGE RECONSTRUCTION USING A HIGH-RESOLUTION, HIGH SIGNAL-TO-NOISE TECHNIQUE E Mark Haacke, Zhi-pei Liang assigned Western Reserve University
to Case
An imaging apparatus and method which provides for reconstruction of images from sampled data with improved resolution, improved signalto-noise, optimal edge detection, and pattern recognition. The apparatus and method are characterized by the use of a priori information (constraints) and a high pass filter on the data to obtain superresolution reconstruction of image data. An object function is approximated by a series of known model functions such as box car and polynomial functions. Solution of the object function depends on a finite number of unknowns whereupon the model parameters can be perfectly resolved to obtain infinite or superresolution. The apparatus and method have parmagnetic application in nuclear ticular resonance imaging as well as other imaging modalities.
4973996 FLOW COMPENSATED NMR FAST PULSE SEQUENCE assigned
A steady-state free precession fast NMR pulse sequence includes a readout gradient waveform which refocuses the transverse magnetization to produce an S- NMR signal during the subsequent pulse sequence. This readout gradient waveform is shaped to null the gradient first moment and to thereby suppress flow and motion artifacts. In an alternative embodiment, crusher pulses employed in the phase encoding or slice select gradients are also flow compensated.
4973907 RF COIL SYSTEM HAVING SEVERAL SURFACE COILS Anthonie H Bergman, hoven, CT, Netherlands Corporation
4973111
Matthew A Bernstein tric Company
V
to General
Elec-
Eddy Boskamp, Eindassigned to U S Philips
An Rf coil system for the detection of MR resonance signals is constructed from a first system of coils for making an overall picture and a second coil system which covers substantially the same area, consists of several coils and for local imaging having a higher resolving power. In particular the latter coils preferably include magnetic resonance sensitive material which become visible on an image formed from detected MR resonance signals for indicating the position of each coil.
4973908 NMR PROBE WITH MULTIPLE ISOLATED COPLANAR SURFACE COILS Paul Bottomley, Christopher to General Electric Company
J Hardy
assigned
An NMR antenna probe has at least one substantially circular surface coil arranged in a plane and a surface coil having substantially a Figure-8 shape, substantially coplanar with the at least one circular surface coil. The Figure-8 coil has a cross-over portion which is located substantially coaxial with the axis of the at least one circular surface coil. The coil corresponding to the least-NMR-sensitive nucleus is circular, while the non-circular coil corresponds to the most-NMR-sensitive nucleus. The circular coil is positioned on the side of the NMR probe closest to the subject to be studied.