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5841278 |
Electromechanical RF switch activated by external magnetic field
An electromechanical switch for use in a magnetic resonance imaging (MRI) apparatus is constructed of non-magnetic materials and includes a pivotable solenoid operative for moving a contact in...
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5841279 |
Body coil, gradient coil and NMR apparatus
An RF coil is surrounded externally with dampers. Arresting plates are attached securely to the exterior of the dampers to arrest vibrations of the latter. The thickness of the arresting plates is...
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5831434 |
Sample tube for nuclear magnetic resonance apparatus
A sample tube for the use in a nuclear magnetic apparatus comprising a sample tube, said sample tube being formed of a glass substance, wherein the magnetic susceptibility of said glass substance...
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5830142 |
Magnetic resonance diagnostic apparatus including a canceling magnetic field generator
A magnetic resonance diagnostic apparatus sequentially generates a high-frequency magnetic field and a gradient magnetic field to generate a MR signal from a subject in a imaging space and...
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5828216 |
Gated RF preamplifier for use in pulsed radiofrequency electron paramagnetic resonance and MRI
A gated RF preamplifier used in system for performing pulsed RF FT EPR spectroscopy and imaging or MRI. The RF preamplifier does not overload during a transmit cycle so that recovery is very fast...
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5821748 |
Gradient coils in magnetic resonance imaging machines
In magnetic resonance imaging machines the gradient coils which generate fast changing magnetic fields vibrate and generate considerable levels of sound. In this invention the vibration of the...
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5814990 |
Method for compensating DC voltage ofsets in measurement channels for nuclear magnetic resonance signals and arrangement for the implementation of the method
In a nuclear magnetic resonance tomography apparatus wherein image information are sampled in time measurement windows with a sampling grid that is not equidistant in time and are digitized, for...
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5814988 |
Combination nuclear magnetic resonance and electromagnetic induction resistivity well logging instrument and method
An apparatus for measuring induction resistivity and nuclear magnetic resonance properties of earth formations penetrated by a wellbore. The apparatus includes a magnet for inducing a static...
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5814992 |
NMR probe head with cryogenically cooled preampifiers
A nuclear magnetic resonance (NMR) probe head for use in a room temperature bore of a superconducting NMR magnet cryostat for investigation of generally room temperature samples comprises a radio...
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5804968 |
Gradient coils with reduced eddy currents
A magnetic resonance imaging apparatus includes a main field magnet (12) for generating a temporally constant magnetic field through an examination region. A radio frequency transmitter (84)...
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5786694 |
Gradient coil system for use in a diagnostic magnetic resonance apparatus
A gradient coil system for a diagnostic magnetic resonance apparatus has two gradient coil arrangements rotated perpendicular to one another, for the production of transverse magnetic field...
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5783943 |
Method and apparatus for positioning an insert gradient coil within an examination region of a magnetic resonance imaging apparatus
A trolley cage (58) selectively positions an insert gradient coil (56) along a patient beam (38) of a magnetic resonance apparatus (A). The trolley cage (58) includes a lower cage assembly (62)...
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5777475 |
Automatic impedance adapter for a H.F. emitter or receiver in a nuclear spin tomography installation and process for operating the device
A device for automatic impedance matching of an RF transmitter or receiver in a nuclear spin tomography installation, and method for operating the device. The impedance matching device contains an...
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5777473 |
Magnetic resonance imaging apparatus
In specific magnetic resonance imaging, magnetization spins are repeatedly excited by excitation pulses, and echoes are repeatedly generated after each of the excitation pulses. The echoes so...
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5767677 |
Suppression of radiation damping in NMR
Radiation damping effects in NMR are compensated by splitting the amplified NMR signal induced in the main probe coil to obtain a correction signal, phase shifting the correction signal to obtain a...
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5760582 |
Optimized gradient coils and shim coils for magnetic resonance scanning systems
Gradient coil assemblies and shim coil assemblies are disclosed for magnetic resonance imaging ("MRI") devices, wherein the coil assemblies comprise a coil support and a conductive wire having a...
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5760583 |
RF coil for MRI and MRI apparatus
A RF coil for MRI is presented which is capable of optimizing current distributions and expanding a magnetic field uniform region using a saddle coil having wide elements also presented is an MRI...
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5757189 |
Arbitrary placement multimode coil system for MR imaging
A multimode radio frequency coil (50 1 ) receives resonance signals from a region of interest while allowing arbitrary placement of the coil. A peripheral electrical conductor (62) is divided into...
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5754048 |
Method and apparatus for precisely controlling the periodic motion of an object
A method and apparatus precisely controlling the periodic motion of an object is specifically applicable to the control of the rotation of a nuclear magnetic resonance (NMR) spectrometer rotor, and...
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5742164 |
Misalignment compensation for MR gradient coil assembly
The invention is directed to a gradient coil assembly for MR imaging which includes a gradient coil set comprising inner and outer gradient coils, the inner gradient coil located within the outer...
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5742165 |
Magnetic resonance apparatus
Magnetic resonance includes predetermined frequency and which is connected, via a connection circuit (14), to a transmission and/or receiving device (11, 13) for RF signals, said connection circuit...
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5739691 |
Multi-frequency digital low pass filter for magnetic resonance imaging
A digital lowpass filter design for filtering nuclear magnetic resonance (NMR) signals in a magnetic resonance imaging (MRI) system supports multiple frequencies and is highly configurable without...
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5736858 |
Modular whole-body gradient coil comprising first and second gradient coils having linear gradients in the same direction
An MRI system incorporating modular whole body gradient coils that can selectively be used for conventional imaging or for ultra-fast imaging. A central modular coil is used alone for the...
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5735278 |
Surgical procedure with magnetic resonance imaging
Apparatus is provided for use in surgical procedures comprising an operating table for receiving a patient for surgery and a magnetic resonance imaging system for obtaining images of a part of the...
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5729142 |
Use of audio signals for monitoring and remediating spinning irregularides in NMR spectrometers
The use of audio signals from rotating samples in an NMR probe in a polarizing magnetic field as part of a nuclear magnetic resonance spectrometer for monitoring and remediating sample spinning...
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5729141 |
Split gradient coils for MRI system
In a magnetic resonance imaging system, wherein a subject to be imaged is supported within a bore of a magnet assembly and exposed to radio frequency (RF) energy emitted from an excitation coil,...
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5726571 |
Apparatus and method for real-time k-space mapping of the scanning operation of a magnetic resonance imaging system
The gradient coil currents driving the RF gradient coil within an magnetic resonance imaging system are noninvasively monitored with Hall-effect sensors to produce a real-time, k-space map of the...
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5722410 |
Apparatus and method for automated determination of surface coil coordinates to correct signal inhomogeneities in magnetic resonance signals
A surface coil (26) is positioned against a subject in the image region to detect emanating radio frequency resonance signals. The detected signals are processed (52) into a magnetic resonance...
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5721490 |
Power source apparatus including a plurality of output current amplifiers connected in parallel and MRI apparatus using the same
A power source apparatus distributes a current command value to be supplied to a load to a plurality of output current amplifiers connected in parallel with the load, and each of the output current...
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5719499 |
Device for excitation and detection of magnetic resonance using orthogonal transmitter probe coils
A device for excitation and detection of magnetic resonance is presented. The device is fashioned on the principle that electromagnetic radiation is effectively described by fewer independent...
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5714884 |
Magnetic resonance imaging apparatus with automatic load timing determination
Time charts describe time points at which a gradient magnetic field is generated, a radio frequency pulse is sent, a magnetic resonance signal is received, and a load is provided to a patient. At...
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5708361 |
Antenna arrangement for a magnetic resonance apparatus
An antenna arrangement for a magnetic resonance apparatus has at least two adjacent individual antennas. Each individual antenna has at least one conductor loop. For mutual decoupling, the...
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5707875 |
170-Labeled phosphoric acid compound and method and apparatus for selective observation of nuclear magnetic resonance signals using the compound
Using a mixed sample of a plurality of phosphoric acid compounds different in chemical structure as a sample for measurement, a 31 P nuclear magnetic resonance signal obtained through...
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5708360 |
Active shield gradient coil for nuclear magnetic resonance imaging apparatus
An active shield gradient coil for a nuclear magnetic resonance imaging, formed by a primary coil having a fingerprint shaped current distribution formed on an inner cylinder in which at least a...
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5701076 |
NMR gradient power supply including a resonant circuit having a frequency with an associated period being less than one-quarter duration of the gradient current
The current supply of a gradient coil in a magnetic resonance tomography apparatus with a gradient amplifier and a connectable capacitor that can be interconnected with the gradient coil to form a...
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5699802 |
Mammography antenna arrangement for NMR examinations of a female breast
In a mammography antenna arrangement for magnetic resonance examinations of a female breast, a conductor arrangement forms a closed circuit and surrounds a receptacle opening for the female breast....
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5699801 |
Method of internal magnetic resonance imaging and spectroscopic analysis and associated apparatus
The invention provides a method for magnetic resonance imaging and spectroscopic analysis of the interior of a specimen which includes positioning the specimen within a main magnetic field,...
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5689189 |
Technique for designing distributed radio frequency coils and distributed radio frequency coils designed thereby
A localized coil (30) is disposed in the temporally constant magnetic field of a magnetic resonance imaging system. The localized coil is designed in five steps: a static problem formulation step,...
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5684402 |
Gradient coil power supply and imaging method
In a magnetic resonance imaging system in which the read and phase directions are rotated with respect to the orthogonal gradient coil directions, a gradient coil is driven to generate a gradient...
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5682893 |
Dome-shaped resonator for nuclear magnetic resonance imaging and spectroscopy
A radiofrequency resonator for nuclear magnetic resonance imaging and spectroscopy of the human head in which the geometry of the resonator comprises a single end ring connected to a plurality of...
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5680046 |
Double-sided RF shield for RF coil contained within gradient coils used in high speed NMR imaging
A magnetic resonance system includes a cylindrical shield disposed between a quadrature RF coil and surrounding gradient coils. The shield includes a pair of copper sheets separated by an...
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5670881 |
Discrete step remotely adjustable matching circuit for MRI RF coils
An RF coil tuning circuit is disclosed in which two banks of parallel capacitive branches are provided. Each capacitive branch includes a fixed value capacitor, a relay and a PIN diode connected in...
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5664568 |
Split-top, neck and head vascular array for magnetic resonance imaging
A coil assembly (40) includes a first, birdcage type head coil assembly (42) dimensioned to receive a patient's head and a second, neck coil assembly (44) including an anterior coil portion (44a)...
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5666055 |
Surface coil system for a single channel NMR receiver
A surface coil system for single channel MRI reception comprising a coil system including a plurality of self-resonant, overlapping coil conductor sections arranged relative to one another and to...
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5663648 |
Gradient coils having increased performance and decreased power consumption for use in MR systems
A gradient coil specifically designed to enhance the performance of Magnetic Resonance (MR) imaging and spectroscopy. In particular, the construction of gradient coils for use with resonant...
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5663647 |
Switching gradient amplifier with adjustable DC bus voltage
An amplification device is provided for driving a gradient coil in an MR system, wherein the gradient coil is required to generate a rapidly changing gradient magnetic field during a first time...
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5661400 |
Antenna for nuclear magnetic resonance tomography
An antenna for nuclear magnetic resonance tomography has at least one annulus antenna surrounded by a passive layer of superconductor material, so that an optimally uniform magnetic field and an...
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5655533 |
Actively shielded orthogonal gradient coils for wrist imaging
A magnetic resonance imaging apparatus includes main field coils (10) for generating a temporally uniform magnetic field longitudinally through a central bore (12). A whole body gradient magnetic...
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5652518 |
Digital filter pre-charging
A method for treating M-degree oversampled impulse response data in real time includes generating N initial pseudo-data points derived from an N tap digital filter, processing each datum therewith,...
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5650724 |
Magnetic-resonance imaging apparatus
A magnetic-resonance imaging apparatus of the present invention comprises a gantry having a subject-placeable inner space and a local coil assembly insertable into an inner space of the gantry. The...
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