Patents by Inventor Alexis Amadon

Alexis Amadon 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).

  • Publication number: 20210173031
    Abstract: 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: Application
    Filed: December 3, 2020
    Publication date: June 10, 2021
    Inventors: Vincent GRAS, Nicolas BOULANT, Michel LUONG, Alexis AMADON
  • Patent number: 10976395
    Abstract: A computer-implemented method of building a database of pulse sequences for parallel-transmission magnetic resonance imaging, includes a) for each of a plurality of subjects, determining an optimal sequence for the subject; b) for each subject, computing the values of the or of a different cost or merit function obtained by playing the optimal sequences for all the subjects; c) aggregating the subjects into a plurality of clusters using a clustering algorithm taking the values, or functions thereof, as metrics; d) for each cluster, determining an averaged optimal sequence for the cluster; e) receiving, as input, a set of features characterizing an imaging subject, comprising at least a morphological feature of the subject; f) associating the subject to one pulse sequence of the database based on the set of features using the computer-implemented classifier algorithm; and g) performing magnetic resonance imaging using the pulse sequence.
    Type: Grant
    Filed: July 2, 2019
    Date of Patent: April 13, 2021
    Assignees: COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES, INSTITUTE NATIONAL DE RECHERCHE EN INFORMATIQUE ET AUTOMATIQUE
    Inventors: Raphaël Tomi-Tricot, Bertrand Thirion, Vincent Gras, Alexis Amadon, Nicolas Boulant, Alexandre Vignaud
  • Publication number: 20200011953
    Abstract: A computer-implemented method of building a database of pulse sequences for parallel-transmission magnetic resonance imaging, includes a) for each of a plurality of subjects, determining an optimal sequence for the subject; b) for each subject, computing the values of the or of a different cost or merit function obtained by playing the optimal sequences for all the subjects; c) aggregating the subjects into a plurality of clusters using a clustering algorithm taking the values, or functions thereof, as metrics; d) for each cluster, determining an averaged optimal sequence for the cluster; e) receiving, as input, a set of features characterizing an imaging subject, comprising at least a morphological feature of the subject; f) associating the subject to one pulse sequence of the database based on the set of features using the computer-implemented classifier algorithm; and g) performing magnetic resonance imaging using the pulse sequence.
    Type: Application
    Filed: July 2, 2019
    Publication date: January 9, 2020
    Inventors: Raphaël TOMI-TRICOT, Bertrand THIRION, Vincent GRAS, Alexis AMADON, Nicolas BOULANT, Alexandre VIGNAUD
  • Publication number: 20170103650
    Abstract: The invention is intended to replace three-colour traffic lights or STOP signs in order to enable motorists to benefit from an alternation of right of way at intersections, without any prolonged or superfluous waiting times in the cases where concurrent lanes are either congested or free of vehicles. The invention comprises an illuminated signal (3) controlled by a traffic light controller and representing a STOP or give-way sign post in force in the highway code. The illuminated signal remains lit for as long as the lights of concurrent lanes, where applicable, are green (1), yellow (2), or for as long as the STOP/give-way signals of concurrent lanes are off, where applicable. It is advantageous to combine three-colour traffic lights with the signal (3) on the same sign post so as to render the right of way explicit.
    Type: Application
    Filed: June 23, 2015
    Publication date: April 13, 2017
    Inventor: Alexis AMADON
  • Patent number: 9291691
    Abstract: A method of exciting nuclear spins in a body, the method comprising the steps of: (a) immerging said body (PB) in a static magnetic field (B0) for aligning nuclear spins along a magnetization axis (z), said static magnetic field being substantially uniform over at least a volume of interest (VOI) of said body; (b) exposing said body, or at least said volume of interest, to a time-varying magnetic field gradient having components (Gx, Gy, Gz) directed along at least three non-coplanar directions (x, y, z) and to a transverse radio-frequency field (B1), whereby said time-varying magnetic field gradient defines a three-dimensional trajectory in k-space constituted by segments linking discrete points (kT1-kT9), and said transverse radio-frequency field deposits radio-frequency energy along at least part of said trajectory for flipping said nuclear spins by a same predetermined flip angle, independently from their position within said volume of interest.
    Type: Grant
    Filed: April 12, 2011
    Date of Patent: March 22, 2016
    Assignee: Commissariat a l'Emergie Atomique et aux Energies Alternatives
    Inventors: Alexis Amadon, Martijn Cloos
  • Publication number: 20130038326
    Abstract: A method of exciting nuclear spins in a body, the method comprising the steps of: (a) immerging said body (PB) in a static magnetic field (B0) for aligning nuclear spins along a magnetization axis (z), said static magnetic field being substantially uniform over at least a volume of interest (VOI) of said body; (b) exposing said body, or at least said volume of interest, to a time-varying magnetic field gradient having components (Gx, Gy, Gz) directed along at least three non-coplanar directions (x, y, z) and to a transverse radio-frequency field (B1), whereby said time-varying magnetic field gradient defines a three-dimensional trajectory in k-space constituted by segments linking discrete points (kT1?kT9), and said transverse radio-frequency field deposits radio-frequency energy along at least part of said trajectory for flipping said nuclear spins by a same predetermined flip angle, independently from their position within said volume of interest.
    Type: Application
    Filed: April 12, 2011
    Publication date: February 14, 2013
    Inventors: Alexis Amadon, Martijn Cloos