|
Match
|
Document |
Document Title |
|
|
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,...
|
|
|
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...
|
|
|
5646835 |
Series resonant converter
A series resonant circuit (SRC) which includes, in one embodiment, an inverter having four (4) IGBTs is described. The SRC also includes a series coupled inductor and capacitor, a transformer, and...
|
|
|
5646530 |
Surface coil for high resolution imaging using a magnetic resonance imaging apparatus
The present invention provides an RF receiver coil with improved signal-to-noise ratio (SNR) characteristics, designed to be positionable immediately adjacent to or surrounding the anatomical...
|
|
|
5646531 |
High-frequency antenna system of a device for nuclear magnetic resonance
The HF antenna system of a nuclear resonance device includes a plurality of antenna elements arranged one behind another in the direction of a longitudinal axis of the system, that are mutually at...
|
|
|
5644235 |
Use of audio signals for monitoring sample spinning speeds in nuclear magnetic spectrometers
The use of audio signals from rotating samples in an NMR probe in a polarizing magnetic field as part of a nuclear magnetic spectrometer is presented.
|
|
|
5638001 |
Magnetic resonance apparatus including a monitor
A magnetic resonance apparatus includes a magnet system (2) for generating a steady magnetic field (H) in a measuring space (28), an RF receiver circuit (10, 14, 16) with an RF receiver coil (10)...
|
|
|
5631561 |
Arrangement for measuring and controlling the basic field of an NMR tomography apparatus
For measuring the basic field, at least one magnetic field probe is attached in the examination region of the nuclear magnetic resonance tomography system. The influence of the magnetic field...
|
|
|
5627470 |
Magnetic resonance apparatus with an illumination means
In a magnetic resonance apparatus having vertically spaced pole shoes with an examination space therebetween and with an illumination system for illuminating at least a part of an examination...
|
|
|
5623430 |
Method for passively shimming an open magnet
A method for passively shimming an open magnet having a magnetic field with an inhomogeneity including an amount of positive 2, 0 Legendre polynomial harmonics. The magnetic field is mapped and the...
|
|
|
5621323 |
Surface coil elements
A coil element, comprising a quadrature surface coil, includes side by side loops, slightly overlapped to the degree necessary to cancel mutual inductance. A coil includes a split-capacitor...
|
|
|
5619996 |
NMR local coil providing improved lower brain imaging
An RF birdcage coil for use in magnetic resonance imaging of the head provides a set of longer conductors at the bottom of the birdcage so as to create a shelf providing improved imaging of the...
|
|
|
5617030 |
Method and apparatus for gradient power supply for a nuclear magnetic resonance tomography apparatus
A gradient coil is connected to a controllable gradient amplifier via a first diagonal of a bridge circuit having four switches and unbiased diodes respectively connected parallel thereto. A...
|
|
|
5617026 |
Quiet magnetic resonance imaging apparatus
A gradient magnetic field generation apparatus for generating a gradient magnetic field in a space in which an inspection object is placed includes at least one gradient magnetic field coil and a...
|
|
|
5610520 |
Automatic orthogonality adjustment device for a quadrature surface coil for magnetic resonance imaging or spectroscopy
An MRI/MRS magnetic coil system is disclosed wherein the isolation between the coils can be adjusted to decrease or virtually eliminate the coupling between quadrature magnetic resonance imaging...
|
|
|
5610521 |
Gradient and RF coil system without RF shield
A superconducting magnet (10) generates a uniform, static magnetic field through a central bore (12) along its longitudinal or z-axis. An insertable coil assembly (40) is inserted into the bore...
|
|
|
5602479 |
Quadrature radio frequency coil for magnetic resonance imaging
In a magnetic resonance imaging apparatus, a radio frequency coil (40) is disposed closely adjacent the patient's head. The radio frequency coil includes a first annular ring (80, 114) around the...
|
|
|
5602478 |
Reduction of RF field disturbance in magnetic resonance apparatus
In a magnetic resonance apparatus including a transducer (25, 31 ) positioned in the examination region of the apparatus, the transducer is connected with equipment (49) outside the examination...
|
|
|
5600244 |
Method for reducing inhomogeneity of surface coils through additional data from homogeneous body coil via temporally separate altivation of the surface and body coils
An MR method is presented for determining the nuclear magnetization distribution in an examination zone, the image data acquired during an MR examination by means of a surface coil arrangement,...
|
|
|
5594341 |
Nuclear magnetic resonance receiver, method and system
An NMR receiver includes an analog to digital converter for sampling a nuclear magnetic resonance probe output signal at a frequency that is less than the probe signal center frequency and is at...
|
|
|
5594337 |
Local coil for magnetic resonance angiography
An angiographic coil for performing blood flow studies of the large vessels of the legs and lower pelvis employs an alternating series of coil elements having orthogonal sensitivities arrayed along...
|
|
|
5594342 |
Nuclear magnetic resonance probe coil with enhanced current-carrying capability
The conductive material in an RF coil disposed in the polarizing field of an NMR apparatus in miminized and the current density at each point in the coil kept constant by providing an inductive...
|
|
|
5592088 |
Multiple-coil adopting a quadrature detection method applied thereto and a signal processing circuit employing the same in an MRI apparatus in a vertical magnetic system
A probe for an MRI apparatus in a vertical magnetic field system including: an array coil which is formed by arranging a plurality of unit coils, which can be driven independently of one another,...
|
|
|
5592087 |
Low eddy current radio frequency shield for magnetic resonance imaging
A magnetic resonance imaging apparatus includes a magnet assembly (10) for generating a temporally constant primary magnetic field through a central bore (14). The central bore is surrounded by a...
|
|
|
5585721 |
Inductively coupled dedicated RF coils for MRI
A dedicated RF coil for MRI comprising tuned primary and secondary circuits having primary and secondary inductors which are inductively coupled. The primary and secondary inductors have respective...
|
|
|
5585723 |
Inductively coupled superconducting coil assembly
The invention provides highly sensitive NMR probes for spectroscopy and microscopy. Thin-film superconducting coils on planar substrates are inductively coupled to form an RF transmitter/receiver....
|
|
|
5583438 |
Inductively coupled dedicated RF coils for MRI
A primary tuned circuit and a secondary tuned circuit are inductively coupled. Primary and secondary inductors of the tuned circuits each exhibit a respective region of sufficiently uniform...
|
|
|
5581185 |
Torque-balanced gradient coils for magnetic resonance 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...
|
|
|
5581186 |
Bird cage resonator for high resolution nuclear magnetic resonance
A resonator which is arranged on a hollow cylindrical support (1) for the taking of high resolution magnetic nuclear resonance spectra from a sample extending along the cylinder axis within the...
|
|
|
5578925 |
Vertical field quadrature phased array coil system
A vertical B 0 temporally constant magnetic field is defined between a pair of pole faces (12, 14) that are interconnected by a C-shaped ferrous magnetic flux path (16). A quadrature radio...
|
|
|
5576622 |
Shielded NMR radio frequency coil and method of performing an NMR experiment
An RF coil for NMR experiments having a conductive path for flowing a field-cancelling current to isolate magnetically the RF coil from its environment. NMR data, particularly MRI data from a human...
|
|
|
5574372 |
Diagnostic magnetic resonance apparatus having a radio frequency shield between the radio frequency antenna and the gradient coil system
In a diagnostic magnetic resonance apparatus having an examination space, a radio-frequency antenna and a gradient coil system, the radio-frequency antenna is arranged closer to the examination...
|
|
|
5574370 |
Nuclear resonance tomography with a toroid cavity detector
A toroid cavity detection system for determining the spectral properties and distance from a fixed point for a sample using Nuclear Magnetic Resonance. The detection system consists of a toroid...
|
|
|
5572131 |
Shielded gradient coil for nuclear magnetic resonance imaging
A unitary, generally cylindrical member supports both the primary and shielding coils. By supporting both coils on a unitary member it is possible to take advantage of the antiphase relationship...
|
|
|
5572130 |
Method and apparatus for the production of an NMR tomography image using an array of surface coils and multiplexers
In a method and apparatus for the production of a nuclear magnetic resonance (NMR) tomography image with radio frequency (RF) signals from an extended measuring object (11) being detected by n...
|
|
|
5572133 |
Magnetic resonance apparatus comprising an improved gradient system
A magnetic measurement apparatus includes a magnet system (1) for generating a steady magnetic field in a measurement space (35), a gradient coil system (3) for generating gradient fields in the...
|
|
|
5572132 |
MRI probe for external imaging
A magnetic resonance imaging (MRI) probe having an external background magnetic field B o is described. The probe has a primary magnet having a longitudinal axis and an external surface extending...
|
|
|
5572128 |
Double resonance antenna arrangement for a nuclear magnetic resonance apparatus
In a double resonance antenna arrangement for a nuclear magnetic resonance apparatus having at least one conductor section that defines an examination region, a series circuit of a capacitive...
|
|
|
5572127 |
Inhomogeneities in static magnetic fields near superconducting coils
Inhomogeneities in the magnetic field in the vicinity of a superconducting NMR receiver coil are avoided by placing the probe, at about room temperature, within the magnetic field, cooling rapidly...
|
|
|
5564421 |
VHF applicator for magnetic resonance imaging
An applicator for coupling an electromagnetic field to a sample to be imaged by magnetic resonance imaging, comprising an electrical periodic structure constructed so as to oscillate with...
|
|
|
5565780 |
NMR radio-frequency coil
In the present invention, an NMR radio-frequency coil suitable for head imaging is disclosed. The coil has a first current path for the generation of the magnetic field. The first current path lies...
|
|
|
5565779 |
MRI front end apparatus and method of operation
A front end unit (32) for a magnetic resonance imaging (MRI) system (20) comprises a plurality of coil attachment ports (46) to which an RF signal or tuning signal is selectively routed thereby...
|
|
|
5561371 |
Transverse gradient coil
Magnetic field gradient coils, such as those typically employed in magnetic resonance (MR) imaging employ folded loop current paths in which a first section carries current along a path close to an...
|
|
|
5559434 |
Magnetic resonance imaging apparatus and RF coil employed therein
An MRI RF coil including first and second ring elements having a plurality of peripheral segments connected in ring shape which are apart from each other along a common vertical axial line. The RF...
|
|
|
5557199 |
Magnetic resonance monitor
A magnetic resonance monitor measures static and extremely low frequency magnetic fields in order to determine the degree of magnetic resonance with the magnetic moments of a biological substrate,...
|
|
|
5557247 |
Radio frequency volume coils for imaging and spectroscopy
A distributed impedance circuit MR coil design comprised of a transmission line tunable cavity resonator which is well suited for but not limited to use at high frequencies and for large volumes...
|
|
|
5555251 |
Arrangement to minimize eddy currents in MR imagers
Two opposite iron core pole pieces of a magnetic resonance medical imager generate a static magnetic field in a patient imaging volume disposed between the pole pieces. Gradient coils are...
|
|
|
5552710 |
Method and automatic auxiliary device for tuning of an NMR receiving coil
A method for tuning of the probe head impedance (Z x ) of an NMR receiver coil having a receiver circuit for an NMR signal with which, by means of an RF tuning signal (3), the probe head impedance...
|
|
|
5552707 |
RF probe which can vary distance between receiving coils which face each other
An RF probe including: two coils for detecting MR signals which are arranged at positions which face each other at a predetermined distance; an apparatus for changing a distance between those...
|
|
|
5546000 |
Method for the reduction of radiation damping during signal acqusition in NMR experiments
A method of reducing radiation damping during free induction decay in NMR measurements of samples having a narrow line width uses the active switching of the quality factor value of the coil...
|