Abstract: A cryogenic device for cooling an RF coil of a Magnetic Resonance Imaging scanner. The cryogenic device includes: a cryocooler providing a cold source; a solid thermal link; the solid thermal link in thermal contact with the cryocooler; a RF coil holder for holding the RF coil, the RF coil holder being in thermal contact with thermal link; a vacuum chamber enclosing the solid thermal link and the RF-coil holder; a measurement surface, facing the RF coil holder; wherein each one of the cryocooler, the solid thermal link, the RF coil holder and the measurement surface is magnetic material free.
Type:
Grant
Filed:
February 14, 2019
Date of Patent:
May 3, 2022
Assignees:
COMMISSARIAT À L'ÉNERGIE ATOMIQUE ET AUX ÉNERGIES ALTERNATIVES, UNIVERSITE PARIS-SACLAY
Inventors:
Gilles Authelet, Marie Poirier-Quinot, Bertrand Baudouy
Abstract: A method for quantifying T1, T2 and resonance frequency simultaneously using magnetic resonance fingerprinting (MRF) includes accessing an MRF dictionary using a magnetic resonance imaging (MRI) system. The MRF dictionary is generated by simulating signal evolutions that include associated off-resonance effects for each signal evolution. The method further includes acquiring MRF data from a region of interest in a subject using the MRI system and a MRF pulse sequence having a plurality of radio frequency (RF) excitations and a readout associated with each RF excitation. Each readout includes a plurality of segments and each segment is used to generate a time frame. The method also include comparing the MRF data to the MRF dictionary to identify a plurality of parameters including T1, T2 and resonance frequency for the MRF data and generating a report indicating the at least one of the plurality of parameters of the MRF data.
Type:
Grant
Filed:
May 17, 2019
Date of Patent:
April 26, 2022
Assignee:
Case Western Reserve University
Inventors:
Yuchi Liu, Jesse Hamilton, Nicole Seiberlich, Mark A. Griswold
Abstract: An embodiment of the invention provides an apparatus for detecting electrostatic discharges (ESD) events, comprising: an ESD detector configured to determine at least one process window that will permit the ESD detector to detect an ESD event; at least one antenna coupled to said ESD detector; and said ESD detector calibrated for at least one discharge energy. Another embodiment of the invention provides: a method for detecting electrostatic discharges (ESD) events, comprising: determining at least one process window that will permit an ESD detector to detect an ESD event; and calibrating the ESD detector for at least one discharge energy.
Type:
Grant
Filed:
September 16, 2016
Date of Patent:
April 19, 2022
Assignee:
Illinois Tool Works Inc.
Inventors:
Lyle D. Nelsen, Steven B. Heymann, Mark E. Hogsett
Abstract: A contacting unit (30) for a test handler (100) for carrying out functional tests on semiconductor elements having a surface, in particular on ICs (200), has a contacting module (60).
Abstract: Multi-shot diffusion-weighted magnetic resonance imaging acquires multiple k-space segments of diffusion-weighted MRI data, estimates reconstructed multi-shot diffusion weighted images, and combines the estimated images to obtain a final reconstructed MRI image. The estimation of images iteratively calculates updated multi-shot images from the multiple k-space segments and current multi-shot images using a convex model without estimating motion-induced phase, constructs multiple locally low-rank spatial-shot matrices from the updated multi-shot images, and calculates current multi-shot images from spatial-shot matrices.
Type:
Grant
Filed:
May 20, 2019
Date of Patent:
April 19, 2022
Assignee:
The Board of Trustees of the Leland Stanford Junior University
Inventors:
Bruce L. Daniel, Brian A. Hargreaves, Yuxin Hu, Evan G. Levine
Abstract: An apparatus and system to nondestructively analyze 2D and 3D cell cultures for cell health using a combination of RF spectroscopy and a radio tomography. The apparatus acquires a signal using a low noise, highly sensitive detector. The signals are combined and compared to the signal of healthy cells.
Type:
Grant
Filed:
June 14, 2018
Date of Patent:
April 12, 2022
Assignee:
NOKOMIS, INC.
Inventors:
James Robert Uplinger, II, Vladimir Makarenko
Abstract: A magnetic resonance imaging apparatus according to an embodiment includes an MRI system and a processing circuitry. The MRI system includes a receiving coil to receive a magnetic resonance signal. The processing circuitry is configured to generate an image based on the magnetic resonance signal, the image including a plurality of pixels; calculate a feature value corresponding to a signal value of the pixel; correct the feature values based on a sensitivity of the receiving coil; and reduce noise in the image based on distribution of the corrected feature values.
Abstract: A sensor unit comprising; a magnetic sensor adapted to detect a magnetic field; a light source adapted to transmit a radiation having a signature; a reflecting member for reflecting radiation emitted by the light source; a radiation sensor adapted to detect radiation reflected by the reflecting member; a controller adapted to generate a signal indicative of a security breach when the magnetic field is detected by the magnetic sensor and the signature is not identified in the radiation received by the radiation sensor.
Type:
Grant
Filed:
May 25, 2017
Date of Patent:
April 5, 2022
Assignee:
Essence Security International (E.S.I.) Ltd.
Abstract: An encoder wheel assembly comprising: a first encoder wheel rotationally fixed to a rotor and having a number n of teeth arranged along the circumference of the encoder wheel; a second encoder wheel rotationally fixed to the first encoder wheel, and having the same number n of teeth as the first encoder wheel along the circumference of the encoder wheel, wherein the teeth of the second encoder wheel have an asymmetrical angular offset relative to the teeth of the first encoder wheel; a first sensor designed to scan the first encoder wheel; a second sensor designed to scan the second encoder wheel; and a controller connected to the first sensor and the second sensor and designed to ascertain the absolute angular position and the rotational direction based on a binary signal derived from a first signal of the first sensor and a second signal of the second sensor.
Abstract: The disclosure provides a position detection system and a method for detecting a movement of a machine. The position detection system comprises a first position sensor configured to detect a magnetic field that forms magnet pole pairs arranged in a row, magnet poles of different polarity being arranged next to one another in each case, a second position sensor configured to detect a magnetic field at an individual magnet arranged in a center of the magnet pole pairs and at a distance from each magnet pole; and an evaluation device configured to evaluate detection results of the first and second position sensors that have been detected based on a movement of an element of the machine relative to the first and second position sensors, the evaluation including identifying a fault based on the detection results of the first and second position sensors.
Abstract: An electrode assembly for a conductivity meter or resistivity meter includes: an electrode main body; a test liquid intake flow path passing through the electrode main body; a pair of voltage electrodes which is respectively provided so that surfaces thereof are exposed to opposing inner wall surfaces forming the test liquid intake flow path; and a pair of current electrodes which is respectively provided so that surfaces thereof are exposed to each of the inner wall surfaces, and in this configuration, each of the pair of current electrodes contains a carbon-based material, and each of the surfaces of the pair of current electrodes exposed to the inner wall surfaces is in a strip shape.
Abstract: A dual nuclear MR transmission line resonator is capable of operating on 1X pairs, with X being 31P, 23Na, 3He, or 129Xe. The resonator avoids many of the problems inherent in conventional dual nuclear designs. No LC trap is used, and the coil has substantially the same spatial profile on both nuclei. In the resonator, an augmented MR tune/match circuit, includes a conventional capacitive L circuit, with the L circuit shunted at a match point by a notch filter tuned to a frequency of a companion nucleus. Also disclosed is a method for simultaneously resonating conductive loops of surface coils or conductive elements of volume coils simultaneously on both 1H and X with hybrid transmission line termination elements bonded to the resonator loop or conductive elements in shunt with respect to one another.
Type:
Grant
Filed:
February 20, 2018
Date of Patent:
February 8, 2022
Assignee:
University Of Florida Research Foundation, Inc.
Abstract: A resolver disposed to monitor a rotatable member is described, along with an associated method for evaluating an output signal therefrom. The method for monitoring the resolver includes supplying an excitation signal to the resolver, and monitoring, at an oversampling rate, first and second output signals from the resolver. An oversampling routine is executed to determine averages of the first and second output signals from the resolver. A demodulation angle error is determined based upon the first and second output signals from the resolver, and provided as feedback. A position of the resolver is also determined based upon the first and second output signals from the resolver.
Type:
Grant
Filed:
July 9, 2019
Date of Patent:
December 28, 2021
Assignee:
GM Global Technology Operations LLC
Inventors:
Young Joo Lee, Anno Yoo, Milan A. Vadera, Daniel J. Berry
Abstract: A computer that determines coefficients in a representation of coil sensitivities and MR information associated with a sample is described. During operation, the computer may acquire MR signals associated with a sample from the measurement device. Then, the computer may access a predetermined set of coil magnetic field basis vectors, where weighted superpositions of the predetermined set of coil magnetic field basis vectors using the coefficients represent coil sensitivities of coils in the measurement device, and where the predetermined coil magnetic field basis vectors are solutions to Maxwell's equations. Next, the computer may solve a nonlinear optimization problem for the MR information associated with the sample and the coefficients using the MR signals and the predetermined set of coil magnetic field basis vectors.
Abstract: The response of a Rogowski coil based current measuring circuit is often proportional to frequency. To correct for this a low pass or integrating function is applied to the response to linearize it. The low pass filter is made from real resistors and capacitors, and tolerances in their values significantly affect the estimate of current. This disclosure relates to a way of addressing such problems. This allows consumers of electricity to have confidence in the accuracy of, for example, their electricity meter.
Type:
Grant
Filed:
June 13, 2018
Date of Patent:
September 21, 2021
Assignee:
Analog Devices International Unlimited Company
Abstract: The invention relates to a local coil matrix and to a magnetic resonance scanner for operation by means of a low magnetic field. The local coil matrix according to the invention has a first coil winding and a second coil winding and a first low-noise pre-amplifier and second pre-amplifier, each electrically connected to a coil winding. The first coil winding has a broadband matching in a first frequency range at a Larmor frequency to the first pre-amplifier connected thereto.
Type:
Grant
Filed:
January 11, 2018
Date of Patent:
September 14, 2021
Assignee:
Siemens Healthcare GmbH
Inventors:
Michael Miosga, Robert Rehner, Markus Vester
Abstract: Provided is an electromagnetic sensor capable of stably measuring electric conductivity and the like even in the case where solid matters are mixed in a sample solution. The electromagnetic sensor includes a substrate, a through hole formed in the substrate, an electrode attached to a surface of the substrate, and a housing that covers the through hole and the electrode, and in this configuration, the sample solution supplied to a surface of the substrate opposite to the surface of the substrate having the electrode attached thereto is allowed to flow into the housing from the through hole and to be accommodated in the housing, so that the sample solution is allowed to be in contact with the electrode.
Abstract: A magnetic angle sensor device and a method for operating such device is provided. The magnetic angle sensor device includes a shaft rotatable around a rotation axis; a magnetic arrangement coupled to the shaft, where the magnetic arrangement produces a differential magnetic field comprising a plurality of diametric magnetic fields; a first magnetic angle sensor provided in the differential magnetic field and configured to generate a first signal that represents a first angle based on a first diametric magnetic field of the differential magnetic field; a second magnetic angle sensor provided in the differential magnetic field and configured to generate a second signal that represents a second angle based on a second diametric magnetic field of the differential magnetic field; and a combining circuit configured to determine a combined rotation angle based on the first signal and on the second signal.
Abstract: Apparatuses, systems, and associated methods of assembly are described that provide for improved sensor wire retention. An example sensor wire retention device includes a bobbin tube that defines a hollow interior configured to receive a probe assembly inserted therein. The device includes one or more coil elements wrapped around at least a portion of the bobbin tube. One or more washers are attached around the bobbin tube, and each of the one or more washers defines one or more wire notches. The device includes a wire harness of one or more wires, and each of the one or more wires of the wire harness are positioned within the one or more wire notches. The device further includes a return shield element disposed around the wires located within the wire notches of the one or more washers, and the return shield element compresses the one or more wires.
Type:
Grant
Filed:
December 27, 2019
Date of Patent:
June 29, 2021
Assignee:
Honeywell International Inc.
Inventors:
Hemanth Hiriyur Ravikumar, Aaron Daniels, Murgesh R. Sajjan
Abstract: A radio frequency power supply according to an embodiment is a radio frequency power supply that amplifies an input signal including application timing of a radio frequency magnetic field and waveform information and that supplies the amplified input signal to a radio frequency coil. The radio frequency power supply includes an amplifier and a controlling unit. The amplifier amplifies the input signal and to output an amplified signal. The controlling circuity varies power supply voltage used by the amplifier for the amplification of the input signal, in accordance with the input signal.