|
Match
|
Document |
Document Title |
|
|
6060882 |
Low-inductance transverse litz foil coils
A family of NMR coils based on Litz foil conductor groups is disclosed. The simplest embodiment is a two-element Litz foil coil. The foils are joined at node (1) and node (2) and are electrically...
|
|
|
6054856 |
Magnetic resonance detection coil that is immune to environmental noise
A noise immune gradiometer split shield coil for use in magnetic resonance etection, such as in Nuclear Magnetic Resonance (NMR) and Nuclear Quadrupole Resonance (NQR). The coil is formed by a...
|
|
|
6051974 |
MRI endocavitary coils and decontamination
An endocavity RF coil assembly for an MRI apparatus includes a reusable probe (30). The reusable probe has a hollow outer cover (60) having a closed distal end and (62) an open proximate end (64)....
|
|
|
6049206 |
Compensation for inhomogeneity of the field generated by the RF coil in a nuclear magnetic resonance system
This invention relates to a technique for compensating for the inhomogeneity of the field generated by the RF coil (B1) in a nuclear magnetic resonance experiment. Current techniques for achieving...
|
|
|
6049207 |
Double-duty gradient coil assembly having two primary gradient coil sets and a common screening coil set
A method of designing a shielded gradient coil assembly (22) for magnetic resonance imaging systems is provided. The gradient coil structure comprises two sets of primary gradient coils (60, 62)...
|
|
|
6043658 |
MR apparatus including an MR coil system
An MR apparatus includes an MR coil system of the so-called bird cage type which operates in a degenerate mode of operation in which all resonance modes and all resonance frequencies coincide. It...
|
|
|
6043656 |
Method for compensating an MRI system for residual magnetization
An MRI system includes a gradient compensation system which appends magnetization reset gradient waveforms to imaging gradient waveforms produced during a scan. The magnetization compensation...
|
|
|
6043659 |
Magnetic resonance imaging system with non-linear preamplification
An MRI system performs a scan to acquire NMR signals from which an image can be reconstructed. The NMR signals are compressed prior to digitization by a nonlinear preamplifier, and after...
|
|
|
6037773 |
Magnetic resonance imaging apparatus
A magnetic resonance imaging apparatus has a gantry including various coils such as a static field coil and gradient field coils, a top board for supporting an examinee and moving the examinee into...
|
|
|
6037775 |
Method and apparatus for magnetic field stabilization in a MRI system
A method of stabilizing the static magnetic field in a magnetic resonance imaging (MRI) system applies a radio frequency pulse to a test sample within the static magnetic field and an NMR signal is...
|
|
|
6034529 |
Local antenna for an MR device
A local antenna for an MR device contains or carries a marking arrangement that permanently contains a substance that can be detected using MR techniques. The marking arrangement allows the...
|
|
|
6031422 |
Power amplifier and nuclear magnetic resonance tomography apparatus employing same
A power amplifier has a supply assembly for offering an intermediate circuit voltage and an output stage connected to the supply assembly for generating an output voltage from the intermediate...
|
|
|
6029082 |
Less-claustrophobic, quadrature, radio-frequency head coil for nuclear magnetic resonance
A less-claustrophobic, quadrature, radio-frequency head coil (42) includes first and second broken end rings (90, 92) connected to each other in parallel by a plurality of leg conductors (94). At...
|
|
|
6028429 |
Composite MRI antenna with reduced stray capacitance
An antenna system for a magnetic resonance imaging apparatus has an active coil connected between a transmitter or receiver and ground and also has an isolated loop coil which is not conductively...
|
|
|
6025720 |
Gradient amplifier and magnetic resonance tomography apparatus employing same
A gradient amplifier for a nuclear magnetic resonance tomography apparatus has at least one control arrangement with a comparator and a controller and a control input for a digital control word, by...
|
|
|
6020740 |
Antenna arrangement for a diagnostic magnetic resonance apparatus
An antenna arrangement having at least a first and a second conductor section (2, 2a, 8) that are connected to one another via a capacitor arrangement (6, 6a, 6b). During operation, the first...
|
|
|
RE36495 |
RF coil identification and testing interface for NMR systems
A movable patient supporting portion (10) of a patient couch (A) includes a socket (26) for receiving a mating plug (24) on a localized coil (B). The patient couch selectively inserts the localized...
|
|
|
6011395 |
Shielded drive for balanced quadrature bird cage coil
A birdcage coil is operated in a balanced mode through connection of signal ground to a shield surrounding the coil. The driven leg of the coil includes tune capacitors, through which balance is...
|
|
|
6008649 |
RF coil apparatus for MR system with lateral B.sub.0 field
RF coil apparatus is provided for use in an MR imaging system, wherein the B 0 field is oriented in a specified direction. The apparatus comprises a coil structure positioned in selected...
|
|
|
6002254 |
Method and apparatus for nuclear magnetic resonance imaging of physiological function information
A nuclear magnetic resonance imaging scheme suitable for an imaging of a physiological function information on a living body. The scheme uses a pulse sequence for realizing a first imaging scheme...
|
|
|
6002256 |
RF magnetic field pulse generator
An rf magnetic field pulse generator for generating an rf magnetic field pulse for use in an NMR investigation. The generator includes two arms connected in parallel between a pair of input...
|
|
|
5999001 |
Gradient magnetic field generation apparatus for a magnetic resonance imaging apparatus
A gradient magnetic field generation apparatus according to the present invention comprises a gradient coil, an assistant voltage selector for generating first and second control signals in...
|
|
|
5997883 |
Retrospective ordering of segmented MRI cardiac data using cardiac phase
A method is disclosed to reconstruct multiphase MR images that accurately depict the entire cardiac cycle. A segmented, gradient-recalled-echo sequence is modified to acquire data continuously....
|
|
|
5998998 |
Gradient coil for NMR devices
A gradient coil (1) to generate switched magnetic field gradients in an nuclear spin resonance (NMR) device consisting of one or several current paths (a, b) following windings and being arranged...
|
|
|
5986454 |
Quadrature elliptical birdcage coil for NMR
Angular and current distributions for an elliptical birdcage resonator are realized in a design that achieves constant electrical phase between adjacent legs of the coil. Equal peak currents in the...
|
|
|
5986455 |
Automatic tuning apparatus and method for substance detection using nuclear quadrupole resonance and nuclear magnetic resonance
Apparatus for tuning a system for detecting a target substance through the use of nuclear quadrupole resonance (NQR) or nuclear magnetic resonance (NMR). The apparatus tunes an RF coil (34) which...
|
|
|
5982179 |
NMR circuit-switch
A 1/4 wave circuit switch for use in an NMR probe has a housing with a stepped cavity for precisely locating switch components inside. The 1/4 wave circuit switch cooperates with a 1/4 wave tube...
|
|
|
5977771 |
Single gradient coil configuration for MRI systems with orthogonal directed magnetic fields
A magnetic resonance imaging apparatus (10) has a main magnet having a pair of pole faces (16,18) defining an examination region (14). The main magnet generates a main magnetic field (12). A couch...
|
|
|
5973495 |
Method and apparatus for eliminating mutual inductance effects in resonant coil assemblies
Method and apparatus for eliminating mutual inductance effects in resonant coil assemblies in which a plurality of coils are situated in sufficiently close proximity to create small mutual...
|
|
|
5973496 |
Device to detect magnetic resonance in the time domain
A device to detect magnetic resonance in the time domain that includes a radiofrequency (RF) source (46), having an output connected to a transmitter (47), wherein the output of the transmitter...
|
|
|
5969526 |
Transmission/reception arrangement for a diagnostic magnetic resonance apparatus
A transmission/reception arrangement for a diagnostic magnetic resonance apparatus has an antenna, a matching and tuning circuit and a signal transmission line. The antenna together with the...
|
|
|
5959453 |
Radial NMR well logging apparatus and method
A nuclear magnetic resonance sensing apparatus, including a magnet for inducing a static magnetic field within materials to be analyzed. The magnetic field is substantially coaxial with a...
|
|
|
5951474 |
Magnetic resonance imaging apparatus for detecting magnetic resonance signals by radio frequency receiving coils
RF receiving coil device used in a magnetic resonance imaging apparatus capable of acquiring a tomographic image of an object under examination positioned in a static magnetic field along a...
|
|
|
5952829 |
Process and device for magnetic resonance examinations
The invention relates to a process for magnetic resonance examinations, in particular nuclear spin tomography, whereby a static magnetic field is produced in an examination zone and at least one...
|
|
|
5939884 |
Method for identifying spikes in MR signals
In a method for identifying spikes in magnetic resonance signals obtained in magnetic resonance tomography, a magnetic resonance signal is obtained and is high-pass filtered. A statistical...
|
|
|
5931781 |
MR method for the imaging of jointed movable parts
The invention relates to A method for imaging jointed movable parts of an object by magnetic resonance, where a third part of the object moves along a trajectory near a pivot between a first and a...
|
|
|
5929639 |
Non-dipolar RF coil for NMR lock and homonuclear decoupling
A single-tuned rf-gradient saddle coil is used for an internal NMR lock in a high-field NMR probe. The non-dipolar lock coil geometry is chosen such that its filling factor and Q are maximized...
|
|
|
5917324 |
MR apparatus provided with a cylindrical coil system and a surface coil system
An MR apparatus which includes a cylindrical coil system and a surface coil system. In order to form a coherent MR image of an as large as possible examination zone by means of an MR apparatus,...
|
|
|
5914601 |
Method for determining the time curve of the basic field of a nuclear magnetic resonance tomography apparatus under switched gradients
In a method for determining the time curve of the basic field of a nuclear magnetic resonance tomography apparatus under switched gradients, a phase-encoding gradient Gvx is prefixed to a readout...
|
|
|
5912558 |
Automatic frequency tuning for MR scanners
A method (100) of automatically tuning a radio frequency transmitter (24) and receiver (38) in a magnetic resonance imaging apparatus to an optimum frequency includes generating and acquiring (104)...
|
|
|
5903151 |
Local antenna arrangement for a magnetic resonance apparatus
In a local antenna arrangement for a magnetic resonance apparatus, an antenna structure is connected to a signal generator via an inhibiting circuit. The signal generator is fashioned to generate...
|
|
|
5903152 |
Magnet system
The invention concerns a magnet system (1) for charging of a superconducting magnet coil (3). The magnet system (1) is characterized by control means (4) for reading-in and controlling which...
|
|
|
5903150 |
Antenna system for NMR and MRI apparatus
An antenna system, for use in an NMR or MRI apparatus which includes a radio frequency (RF) signal transmitter and a radio frequency (RF) signal receiver, includes at least first and second...
|
|
|
5898306 |
Single circuit ladder resonator quadrature surface RF coil
A single-circuit quadrature surface coil is formed from two ladder resonator coils and includes a first mode circuit path for detecting or generating magnetic flux in a vertical axis from a body...
|
|
|
5882304 |
Method and apparatus for determining probe location
A magnetic probe (1) for use with a magnetic resonance imaging apparatus comprises an electron spin resonance (ESR) magnetometer. The position of the probe (1) tracked by measuring the resonant...
|
|
|
5874831 |
Magnetic resonance imaging (MRI) system
A magnetic resonance imaging (MRI) system includes a computer for performing overall control and signal processing, a pulse generator for generating a predetermined RF pulse signal and a gradient...
|
|
|
5869966 |
Radio frequency coil switching
In Magnetic Resonance Imaging Apparatus, it is necessary to switch the radio frequency electric coils which are positioned around the patient in the imaging volume very rapidly. The present...
|
|
|
5868674 |
MRI-system and catheter for interventional procedures
An MR system for interventional procedures, includes an MR imaging device and an interventional instrument, for example a catheter. The MR device is arranged to acquire images of a part of an...
|
|
|
5867027 |
Magnetic resonance imaging apparatus
In a magnetic resonance imaging apparatus, gradient magnetic fields and a radiofrequency magnetic field are applied to a subject placed in a static magnetic field to excite nucleuses and generate...
|
|
|
5864235 |
Nuclear magnetic resonance tomography apparatus with a combined radio-frequency antenna and gradient coil structure
A nuclear magnetic resonance tomography apparatus with a combined radio-frequency antenna and gradient coil structure has a gradient coil is divided onto at least two cylinder surfaces concentric...
|