Patents by Inventor Michel Luong
Michel Luong has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11262427Abstract: A method of designing a pulse sequence for parallel-transmission MRI includes a) for each one of a plurality of subjects, estimating a linear adjustment transformation (L), converting amplitude maps of RF fields generated by respective transmit channels of a MRI apparatus into respective standardized maps; and b) determining RF waveforms (P) minimizing a discrepancy between subject-specific distributions of flip-angles of nuclear spin and a target distribution, averaged over said subjects, the subject-specific distributions corresponding to the flip-angle distributions achieved by applying a superposition of RF fields, each having a temporal profile described by one of said RF waveforms and a spatial amplitude distribution described by a respective standardized map determined for the subject. A method and an apparatus for performing parallel-transmission MRI using such a pulse sequence are provided.Type: GrantFiled: December 3, 2020Date of Patent: March 1, 2022Assignee: COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVESInventors: Vincent Gras, Nicolas Boulant, Michel Luong, Alexis Amadon
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Publication number: 20210173031Abstract: A method of designing a pulse sequence for parallel-transmission MRI includes a) for each one of a plurality of subjects, estimating a linear adjustment transformation (L), converting amplitude maps of RF fields generated by respective transmit channels of a MRI apparatus into respective standardized maps; and b) determining RF waveforms (P) minimizing a discrepancy between subject-specific distributions of flip-angles of nuclear spin and a target distribution, averaged over said subjects, the subject-specific distributions corresponding to the flip-angle distributions achieved by applying a superposition of RF fields, each having a temporal profile described by one of said RF waveforms and a spatial amplitude distribution described by a respective standardized map determined for the subject. A method and an apparatus for performing parallel-transmission MRI using such a pulse sequence are provided.Type: ApplicationFiled: December 3, 2020Publication date: June 10, 2021Inventors: Vincent GRAS, Nicolas BOULANT, Michel LUONG, Alexis AMADON
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Patent number: 10788549Abstract: An antenna array includes a plurality of linear electromagnetic resonators having longitudinal axes oriented parallel to one another and not aligned, and at least one decoupling device arranged between two the linear electromagnetic resonators, wherein the decoupling device comprises a plurality of open-loop electromagnetic resonators that are matched to a frequency located in the bandwidth of the two the adjacent linear electromagnetic resonators, that are electrically insulated and that are arranged in a plurality of planes that are not parallel to a plane containing the longitudinal axes of the two the linear electromagnetic resonators. Nuclear magnetic resonance imaging apparatus comprising such an antenna array is also provided.Type: GrantFiled: January 5, 2017Date of Patent: September 29, 2020Assignees: COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES, CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, UNIVERSITE D'AIX-MARSEILLEInventors: Elodie Georget, Michel Luong, Alexandre Vignaud, Eric Giacomini, Edouard Chazel, Redha Abdeddaim, Stefan Enoch, Gérard Tayeb
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Publication number: 20190018090Abstract: An antenna array includes a plurality of linear electromagnetic resonators having longitudinal axes oriented parallel to one another and not aligned, and at least one decoupling device arranged between two the linear electromagnetic resonators, wherein the decoupling device comprises a plurality of open-loop electromagnetic resonators that are matched to a frequency located in the bandwidth of the two the adjacent linear electromagnetic resonators, that are electrically insulated and that are arranged in a plurality of planes that are not parallel to a plane containing the longitudinal axes of the two the linear electromagnetic resonators. Nuclear magnetic resonance imaging apparatus comprising such an antenna array is also provided.Type: ApplicationFiled: January 5, 2017Publication date: January 17, 2019Inventors: Elodie GEORGET, Michel LUONG, Alexandre VIGNAUD, Eric GIACOMINI, Edouard CHAZEL, Redha ABDEDDAIM, Stefan ENOCH, Gérard TAYEB
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Patent number: 9933374Abstract: A device for measuring the unloaded quality factor of a resonant cavity which has an input port to accept incident power and an output port to measure the dissipated power, wherein the device includes: a transmission line designed to be coupled to the input port of the resonant cavity to be characterized, which has a coupling coefficient ?i and which is designed to transmit an incident power generated by a power generator; a switch located upstream of the transmission line at a distance from the cavity which is equivalent to (2n+1)?g/4, where n is a whole number equal to or greater than zero and ?g the wavelength of the wave guided by the transmission line, the switch allowing the coupling coefficient ?i at the input port to the cavity to be modified at the time of the measurement of the unloaded quality factor of the cavity.Type: GrantFiled: September 19, 2014Date of Patent: April 3, 2018Assignee: COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVESInventor: Michel Luong
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Patent number: 9880241Abstract: A patch resonator for nuclear magnetic resonance device includes a ground plane, a conductive element, a dielectric element positioned between the ground plane and the conductive element, the resonator being able to transmit a circularly polarized radiofrequency signal when the resonator is supplied by a first transmission line connected to the conductive element via a first connection point and able to receive alternatively a radiofrequency signal circularly polarized in the opposite direction when the resonator is connected to a second transmission line via a second connection point, the resonator including a switch mounted in parallel on each transmission line at a distance from the ground plane corresponding to (2n+1)?/4 with n a natural integer, and ? the wavelength of the guided wave in the transmission line at the operating frequency of the resonator, the switch making it possible to electrically connect/disconnect the transmission lines from the conductive element.Type: GrantFiled: March 10, 2015Date of Patent: January 30, 2018Assignee: COMMISSARIAT À L'ÉNERGIE ATOMIQUE ET AUX ÉNERGIES ALTERNATIVESInventors: Guillaume Ferrand, Michel Luong
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Patent number: 9768498Abstract: A multiple-channel antenna includes a first loop resonator including a radiating element forming a loop; a second resonator adjacent to the first loop resonator including a radiating element; wherein the radiating element of the first loop resonator has a main surface defined along a first median plane; a secondary surface defined along a second median plane, the secondary surface delimiting an appendix of the radiating element placed facing the second resonator and having an inclination relative to the median plane of the main surface and wherein the second resonator is a linear resonator with a straight radiating element.Type: GrantFiled: February 27, 2014Date of Patent: September 19, 2017Assignee: COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVESInventors: Michel Luong, Guillaume Ferrand
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Patent number: 9562957Abstract: A method of making a compact control module of a high frequency antenna for a magnetic resonance imaging device including M control elements and N radiating elements, N greater than M, the control module represented by a control matrix {tilde over (P)}, approximately equal to a control matrix P to control the radiating elements, the method including: decomposing the control matrix {tilde over (P)} into a product of two matrices H×L; the matrix L with dimensions M×M capable of transforming M signals Vm transmitted by M control elements into M signals Vl, in amplitude and in phase; the matrix H with dimensions N×M receiving the M signals Vl as inputs; producing the matrix FI with a number of stages less than a number of stages necessary for implementation of the matrix P; and using the matrix L starting from implementation of the matrix H determined during the producing.Type: GrantFiled: July 6, 2012Date of Patent: February 7, 2017Assignee: COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVESInventors: Guillaume Ferrand, Michel Luong
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Patent number: 9520636Abstract: A linear resonator of a high-frequency antenna suitable for emitting a radiofrequency energisation signal and for receiving a radiofrequency relaxation signal, the linear resonator includes a radiating element to emit af radiofrequency energisation signal and receive a radiofrequency relaxation signal. The resonator also includes: a balun circuit including a power-supply line and two coupling lines; a substrate made of a dielectric material, supporting the radiating element which contains the balun circuit; two contact points connecting the balun circuit to the radiating element, the contact points being formed by one of the ends of the coupling lines extending out of the substrate, the distance separating the two contact points being selected so as to ensure the impedance matching of the resonator; and a chip floorplan separating the coupling lines from the radiating element.Type: GrantFiled: February 7, 2011Date of Patent: December 13, 2016Assignee: COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVESInventors: Guillaume Ferrand, Michel Luong, Alain France
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Patent number: 9234954Abstract: A method for creating a module for controlling a magnetic resonance imaging apparatus antenna, the method including: determining magnetic field distribution mapping B1+; constructing a matrix {tilde over (B)} from the selection of a plurality of x*m points B+1(i,j) such that {tilde over (B)}(i,j)?B+1(i,j) determining the singular vectors of the matrix {tilde over (B)} by singular value decomposition; and arranging a coupling means and/or phase-shifting means, forming said control module, such that a signal Soj outputted from the control module is a function of the equation So j = ? k = 1 n ? ? V k , j · Si k , with Sik being the input signal.Type: GrantFiled: February 18, 2011Date of Patent: January 12, 2016Assignee: COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVESInventors: Guillaume Ferrand, Michel Luong, Alain France
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Publication number: 20150253398Abstract: A patch resonator for nuclear magnetic resonance device includes a ground plane, a conductive element, a dielectric element positioned between the ground plane and the conductive element, the resonator being able to transmit a circularly polarized radiofrequency signal when the resonator is supplied by a first transmission line connected to the conductive element via a first connection point and able to receive alternatively a radiofrequency signal circularly polarized in the opposite direction when the resonator is connected to a second transmission line via a second connection point, the resonator including a switch mounted in parallel on each transmission line at a distance from the ground plane corresponding to (2n+1)?/4 with n a natural integer, and ? the wavelength of the guided wave in the transmission line at the operating frequency of the resonator, the switch making it possible to electrically connect/disconnect the transmission lines from the conductive element.Type: ApplicationFiled: March 10, 2015Publication date: September 10, 2015Inventors: Guillaume FERRAND, Michel LUONG
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Publication number: 20150108999Abstract: A device for measuring the unloaded quality factor of a resonant cavity which has an input port to accept incident power and an output port to measure the dissipated power, wherein the device includes: a transmission line designed to be coupled to the input port of the resonant cavity to be characterized, which has a coupling coefficient ?i and which is designed to transmit an incident power generated by a power generator; a switch located upstream of the transmission line at a distance from the cavity which is equivalent to (2n+1)?g/4, where n is a whole number equal to or greater than zero and ?g the wavelength of the wave guided by the transmission line, the switch allowing the coupling coefficient ?i at the input port to the cavity to be modified at the time of the measurement of the unloaded quality factor of the cavity.Type: ApplicationFiled: September 19, 2014Publication date: April 23, 2015Inventor: Michel LUONG
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Publication number: 20140239953Abstract: A multiple-channel antenna includes a first loop resonator including a radiating element forming a loop; a second resonator adjacent to the first loop resonator including a radiating element; wherein the radiating element of the first loop resonator has a main surface defined along a first median plane; a secondary surface defined along a second median plane, the secondary surface delimiting an appendix of the radiating element placed facing the second resonator and having an inclination relative to the median plane of the main surface and wherein the second resonator is a linear resonator with a straight radiating element.Type: ApplicationFiled: February 27, 2014Publication date: August 28, 2014Inventors: Michel Luong, Guillaume Ferrand
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Publication number: 20140232404Abstract: A method of making a compact control module of a high frequency antenna for a magnetic resonance imaging device including M control elements and N radiating elements, N greater than M, the control module represented by a control matrix {tilde over (P)}, approximately equal to a control matrix P to control the radiating elements, the method including: decomposing the control matrix {tilde over (P)} into a product of two matrices H×L; the matrix L with dimensions M×M capable of transforming M signals Vm transmitted by M control elements into M signals V1, in amplitude and in phase; the matrix H with dimensions N×M receiving the M signals V1 as inputs; producing the matrix H with a number of stages less than a number of stages necessary for implementation of the matrix P; and using the matrix L starting from implementation of the matrix H determined during the producing,Type: ApplicationFiled: July 6, 2012Publication date: August 21, 2014Applicant: COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVESInventors: Guillaume Ferrand, Michel Luong
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Publication number: 20130015858Abstract: A linear resonator of a high-frequency antenna suitable for emitting a radiofrequency energisation signal and for receiving a radiofrequency relaxation signal, the linear resonator includes a radiating element to emit a radiofrequency energisation signal and receive a radiofrequency relaxation signal. The resonator also includes: a balun circuit including a power-supply line and two coupling lines; a substrate made of a dielectric material, supporting the radiating element which contains the balun circuit; two contact points connecting the balun circuit to the radiating element, the contact points being formed by one of the ends of the coupling lines extending out of the substrate, the distance separating the two contact points being selected so as to ensure the impedance matching of the resonator; and a chip floorplan separating the coupling lines from the radiating element.Type: ApplicationFiled: February 7, 2011Publication date: January 17, 2013Applicant: Commissariat a energie atomique et aux energies alternativesInventors: Guillaume Ferrand, Michel Luong, Alain France
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Publication number: 20130002254Abstract: A method for creating a module for controlling a magnetic resonance imaging apparatus antenna, the method including: determining magnetic field distribution mapping B1+; constructing a matrix {tilde over (B)} from the selection of a plurality of x*m points B+1(i,j) such that {tilde over (B)}(i,j)?B+1(i,j) determining the singular vectors of the matrix {tilde over (B)} by singular value decomposition; and arranging a coupling means and/or phase-shifting means, forming said control module, such that a signal Soj outputted from the control module is a function of the equation So j = ? k = 1 n ? ? V k , j · Si k , with Sik being the input signal.Type: ApplicationFiled: February 18, 2011Publication date: January 3, 2013Applicant: Commissariat à I' énergie atomique et aux énergies alternativesInventors: Guillaume Ferrand, Michel Luong, Alain France
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Patent number: 7592811Abstract: A high frequency cavity resonator for nuclear magnetic resonance, including: a set of transmission lines; and a shield surrounding these transmission lines, wherein each of these transmission lines includes a straight bar which is divided into elongated cylindrical segments, these segments being or being made electrically conducting, the bar being provided with thin solid dielectric elements inserted between the segments.Type: GrantFiled: February 4, 2005Date of Patent: September 22, 2009Assignee: Commissariat a l'Energie AtomiqueInventors: Michel Luong, Xavier Hanus, Michel Desmons, Franck Lethimonier, Eric Giacomini
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Patent number: 7321280Abstract: Transmission line and high frequency cavity resonator using such transmission lines, particularly for Nuclear Magnetic Resonance. This transmission line comprises a straight and segmented (1) bar, these segments being (or being made) electrically conducting, the bar being provided with dielectric elements (2) inserted between the segments.Type: GrantFiled: May 11, 2004Date of Patent: January 22, 2008Assignee: Commissariat a l'Energie AtomiqueInventors: Michel Luong, Xavier Hanus, Michel Desmons, Franck Lethimonier, Eric Giacomini
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Publication number: 20070132529Abstract: This cavity resonator comprises a set of transmission lines and a shield which surrounds them. Each transmission line comprises a rectilinear bar which is divided into elongated cylindrical segments (1) these segments being or being made electrically conducting, the bar being provided with thin dielectric elements (2) inserted between the segments.Type: ApplicationFiled: February 4, 2005Publication date: June 14, 2007Applicant: Commissariat A L'Energie AtomiqueInventors: Michel Luong, Xavier Hanus, Michel Desmons, Franck Lethimonier, Eric Giacomini
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Publication number: 20050174201Abstract: Transmission line and high frequency cavity resonator using such transmission lines, particularly for Nuclear Magnetic Resonance. This transmission line comprises a straight and segmented (1) bar, these segments being (or being made) electrically conducting, the bar being provided with dielectric elements (2) inserted between the segments.Type: ApplicationFiled: May 11, 2004Publication date: August 11, 2005Applicant: COMMISSARIAT A L'ENERGIE ATOMIQUEInventors: Michel Luong, Xavier Hanus, Michel Desmons, Franck Lethimonier, Eric Giacomini