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6456072 |
Method and apparatus for simultaneous acquisition of high resolution NMR spectra from multiple samples
An apparatus for obtaining multiple spectra from a plurality of samples through the use of nuclear magnetic resonance (NMR) spectroscopy. A plurality of microcoils are coupled to and are in...
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6452394 |
Transfer of the resonance frequency of the resonance circuit by extra RF frequency combined with the excitation RF pulse
A main magnetic field (B 0 ) is applied through an imaging region ( 10 ). High power RF excitation or manipulation electrical pulses ( 56 ) are applied to transmit coils ( 30 ), ( 30 ′). The...
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6452392 |
Spin resonance spectrometer with protection from reflected harmonics
A spin resonance spectrometer comprises a radio frequency transmitter operating at a predetermined basic frequency and a probehead supplied by the radio frequency transmitter. At least one load is...
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6452388 |
Method and apparatus of using soft non-ferritic magnetic material in a nuclear magnetic resonance probe
The present invention provides a novel use of a powdered high saturation flux density soft magnetic material as a NMR probe core material. The probe structural geometry facilitates the use of...
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6452393 |
Nuclear magnetic resonance birdcage coil with Cassinian oval former
A shielded birdcage-type radiofrequency (RF) resonance coil having a non-circular cross-sectional shape corresponding to a Cassinian oval. The placement of longitudinal conducting elements in the...
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6448775 |
Gradient amplifier with combined current regulation and differential control
Gradient amplifier for an MR tomography apparatus has a controller for current control that is connected to a modulator stage upstream before an output stage. The output stage supplies a voltage to...
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6448774 |
Gradient coil system for a magnetic resonance tomography apparatus for producing gradient fields with obliquely oriented gradients
A gradient coil system of a magnetic resonance tomography apparatus is fashioned as a hollow cylinder whose hollow interior cross-section is an ellipse with a minor ellipse axis and a major ellipse...
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6448770 |
Gain selection for magnetic resonance imaging and spectroscopy
A method of magnetic resonance imaging includes supporting a subject in an examination region of an MRI scanner(A). An MRI pulse sequence is applied to produce a detectable magnetic resonance...
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6445183 |
Magnetic resonance image diagnosing apparatus
A burst wave 91 is applied as an RF magnetic filed in order to excite nuclei of hydrogen, and also a oradient magnetic field 95 along a readout direction is applied so as to excite...
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6441614 |
Filler material for magnet resonant system self-shielded gradient coil assemblies
A self-shielded gradient coil assembly for an MR imaging system has inner and outer gradient coil windings disposed in coaxial relationship and defining a hollow annular space therebetween. Inner...
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6441615 |
Crossed-ladder RF coils for vertical field MRI systems
A crossed-ladder RF coil assembly ( 48 ) is employed for quadrature excitation and/or reception in an open or vertical field magnetic resonance apparatus. The RF coil assembly ( 48, 70, 90 )...
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6437570 |
Cooled NMR probe head with uniform temperature control of the sample
An NMR (=nuclear magnetic resonance) probe head comprising an RF (=radio frequency) receiver coil system, which can be cooled down to cryogenic temperatures, and a room temperature pipe ( 5 ),...
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6437568 |
Low noise MRI scanner
A low noise imaging apparatus for producing Magnetic Resonance (MR) images of a subject and for substantially minimizing acoustic noise generated during imaging is provided. The imaging apparatus...
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6438402 |
Step-tapered flexible peripheral coil
A flexible peripheral coil for magnetic resonance imaging provides a tapered volume conforming to a patient through the use of multiple flexible leaves of decreasing combined length which enclose...
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6433548 |
RF coil, magnetic resonance signal measuring apparatus, and magnetic resonance imaging apparatus
Coils surrounding the forehead of an imaging subject and coils wrapped around the nose elevation for the part from the nose down are provided to effectively obtain an image of a head, and by...
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6429656 |
Polarizing antenna for a magnetic resonance apparatus
A polarizing antenna for a magnetic resonance apparatus for irradiating an imaging volume surrounded by the antenna, has two or a multiple of two longitudinal conductors that are arranged with the...
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6430429 |
Magnetic resonance imaging system with an interventional instrument
A magnetic resonance imaging (MRI) system is provided with an interventional instrument with an indicator element which influences, for example locally disturbs, the magnetic resonance image. The...
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6429657 |
Apparatus for improving image depth resolution in a magnetic field imaging apparatus
A magnetic field imaging apparatus for sensing a magnetic field generated by current flowing in the semiconductor device includes a pair of sensing devices which may be focused at a chosen depth in...
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6426624 |
Assembly formed by a magnetic resonance apparatus and a combination of coils
MRI apparatus with a magnet assembly for generating a uniform magnetic field in a measuring volume, wherein a combination of at least two magnetic coils is arranged adjacent an object to be...
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6420873 |
MRI noise detector and suppressor
An improved transient interference detector and suppressor for an MRI system detects the presence of transient interference in an MRI signal by detecting the envelope of the MRI signal and...
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6420872 |
Probe for detecting a transient magnetic resonance signal, wherein the ratio of the Q of the probe to the Q of the resonance signal is relatively large
An apparatus which includes a probe for detecting a resonance signal induced in a sample. The probe and the resonance signal each have a respective, corresponding Q, and the ratio, Q′, of the Q...
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6420871 |
Multiple tuned birdcage coils
A multiple tuned birdcage coil structure has a plurality of birdcage coils arranged coaxially one inside another around a central axis. Each of the birdcage coils has two conductor rings separated...
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6418336 |
MR tomography apparatus and method for suppressing stimulation of an examination subject
In an MR tomography system and a method for operating an MR tomography system for the purpose of executing both fast and conventional measuring sequences with high image resolution without...
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6414488 |
Method and apparatus for decoupling magnetic resonance receive coils
A magnetic resonance imaging apparatus creates images by exciting magnetic resonance in selected nuclei disposed within an image region. Through the image region a main magnetic field (B 0 ) is...
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6414489 |
Apparatus for reducing acoustic noise in an MR imaging system
Apparatus is provided for reducing the level of acoustic noise or energy which is received by an imaging subject located within the bore of an MR imaging system. The apparatus comprises a bridge...
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6411093 |
Frequency generator for NMR applications with direct digital frequency synthesis (DDS)
A method of operating a high-resolution NMR spectrometer comprising a DDS generator containing an NCO L for generating an LO frequency, wherein the frequency of the NCO L is defined by inputting...
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6411090 |
Magnetic resonance imaging transmit coil
A magnetic resonance imaging (MRI) coil system is provided which comprises an RF coil element comprising a plurality of electrically conductive members spaced to form a generally tubular structure...
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6411091 |
Coil for MRI apparatus
With the objective of reducing the coupling capacitance of a pattern crossing section in a simple structure thereby to produce a high-quality tomographic image based on a larger value of the coil,...
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6408202 |
Transesophageal magnetic resonance analysis method and apparatus
A method of transesophageal magnetic resonance analysis of a patient, such as an animal or human, includes providing a loopless antenna formed from a flexible coaxial cable having an extended...
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6407549 |
Magnetic resonance signal acquiring method and apparatus, recording medium and magnetic resonance imaging apparatus
For the purpose of increasing the time available for performing a calculation on a navigator echo, the sampling frequency for a navigator echo is made higher than the sampling frequency for an...
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6404201 |
Magnetic resonance imaging RF coil
A radio frequency (RF) coil system for resonance imaging/analysis comprising a primary coil element having a plurality of axial conductors spaced to form a generally tubular structure having two...
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6400155 |
In-room MRI display terminal remote control system
An MRI control system for controlling the operation of an MRI scanner from within an RF shielded MRI exam room in which the MRI scanner is located includes an MRI compatible infrared remote control...
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6400157 |
MRI methods and systems
Methods for changing the values of parameters of a pulse sequence of a magnetic resonance imaging scanning procedure to change a characteristic of at least one image resulting from the scanning...
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6400154 |
Multiple tunable double ring surface coil with high B1 homogeneity
To perform multinuclear magnetic resonance spectroscopy and imaging, a coil with a high signal-to-noise ratio and spatially uniform B 1 field that covers the same volume of interest at several...
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6400158 |
MRI apparatus with digital control and correction of the gradient current pulses
Gradient current pulses which generate pulse-shaped magnetic gradient fields in an MRI apparatus may be composed of gradient pulse samples which directly succeed one another and are generated by a...
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6396272 |
Method of cancelling lorentz force-produced oscillations in a gradient tube, and magnetic resonance imaging apparatus operating according to the method
In a method for the operation of a magnetic resonance apparatus having at least one gradient coil and elements for generating a force acting on the gradient tube, with which natural oscillation...
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6396271 |
Tunable birdcage transmitter coil
A tunable radio frequency birdcage coil ( 26, 34 ) has an improved tuning range for use with a magnetic resonance apparatus. The coil includes a pair of end ring conductors ( 60, 62 ) which are...
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6384603 |
Quadrature RF field coil for use in magnetic resonance
There is described a quadrature radio frequency (RF) coil design to be used with appropriate magnetic resonance imaging (MRI) hardware to obtain images of the human body. The design provides good...
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6384601 |
Local magnetization spoiling using a gradient insert for reducing the field of view in magnetic resonance imaging
A method, and related apparatus, for suppressing the magnetic resonance signal to an experimentally adjustable depth by applying a spatially inhomogeneous field between the slice-select pulse and...
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6384602 |
Mounting system and RF shield for high field open magnet
A secure and stable mounting system for High Field Open (HFO) magnets. A stainless steel mounting plate is secured to the RF screen room floor and the HFO magnet is secured to the mounting plate....
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6380742 |
Balanced mode operation of a high frequency NMR probe
An NMR probe, lacking electrical balance in respect of the RF coil thereof, includes a conducting shield of axial extent greater than λ/4 from the ground plane closure of said shield of the probe...
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6377044 |
Multi-mode receiver coils for MRI
A magnetic resonance apparatus includes a multi-mode receiver assembly which facilitates operation in both a quadrature combination mode and phased array mode. The multi-mode receiver assembly...
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6377836 |
RF coil array for vertical field MRI
An RF coil array arrangement for enhanced magnetic resonance imaging of the breast or spine regions of prone and supine patients within a vertically oriented B 0 field is disclosed. Several RF...
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6377048 |
Magnetic resonance imaging device for operation in external static magnetic fields
An MRI system is presented utilizing a magnetic assembly of a kind which, when accommodated within a primary static reasonably homogeneous magnetic field created by the MRI system affects the...
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6377047 |
Superconducting birdcage coils
Superconducting birdcage coil with low-pass and high-pass coil configurations are formed by using strips each with an elongated sapphire substrate with a layer of a high temperature superconductor...
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6369572 |
MRI apparatus with a feed forward loop inserted in the gradient loop
Gradient pulses are generated in an MRI apparatus by a control circuit in which disturbing influences are liable to occur; consequently, the gradient current pulses are not shaped exactly as...
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6366093 |
Re-entrant RF cavity resonator for magnetic resonance
A re-entrant radio-frequency (RF) TE 11 -mode cavity resonator allows generating a spatially homogeneous RF magnetic field for magnetic resonance (NMR, MRI) applications. The azimuthal current...
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6366091 |
Nuclear magnetic resonance imaging method and apparatus therefor
A plurality of signal acquisition steps 103 to 106 are executed continuously in succession to an inversion longitudinal magnetization generation step 101 for generating inversion...
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6366094 |
Control of MRI system
A personal computer or “PC” based software control system for a magnetic resonance imaging or “MRI” scanner. The software control system manages various types of MRI scanners without...
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6362622 |
Method and apparatus to embed and retrieve attribute information in magnetic resonance imaging coils
A magnetic resonance imaging system includes a patient couch ( 10 ) which selectively positions a patient relative to an examination region ( 14 ). An imaging coil (B) is disposed adjacent to a...
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