FR3128781B1 - dispositif d’imagerie par résonance magnétique - Google Patents

dispositif d’imagerie par résonance magnétique Download PDF

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Publication number
FR3128781B1
FR3128781B1 FR2111501A FR2111501A FR3128781B1 FR 3128781 B1 FR3128781 B1 FR 3128781B1 FR 2111501 A FR2111501 A FR 2111501A FR 2111501 A FR2111501 A FR 2111501A FR 3128781 B1 FR3128781 B1 FR 3128781B1
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FR
France
Prior art keywords
radio frequency
assembly
bandwidth
intrinsic
imaging device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
FR2111501A
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English (en)
Other versions
FR3128781A1 (fr
Inventor
Marc Dubois
Vera Gianfranco Andia
Mathieu Cosker
Tryfon Antonakakis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MULTIWAVE TECHNOLOGIES, FR
Original Assignee
Multiwave Imaging
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Multiwave Imaging filed Critical Multiwave Imaging
Priority to FR2111501A priority Critical patent/FR3128781B1/fr
Priority to PCT/FR2022/052002 priority patent/WO2023073311A1/fr
Publication of FR3128781A1 publication Critical patent/FR3128781A1/fr
Application granted granted Critical
Publication of FR3128781B1 publication Critical patent/FR3128781B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
    • G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
    • G01R33/3628—Tuning/matching of the transmit/receive coil
    • G01R33/3635—Multi-frequency operation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
    • G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
    • G01R33/3628—Tuning/matching of the transmit/receive coil
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
    • G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
    • G01R33/34046—Volume type coils, e.g. bird-cage coils; Quadrature bird-cage coils; Circularly polarised coils
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
    • G01R33/383—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using permanent magnets
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
    • G01R33/445—MR involving a non-standard magnetic field B0, e.g. of low magnitude as in the earth's magnetic field or in nanoTesla spectroscopy, comprising a polarizing magnetic field for pre-polarisation, B0 with a temporal variation of its magnitude or direction such as field cycling of B0 or rotation of the direction of B0, or spatially inhomogeneous B0 like in fringe-field MR or in stray-field imaging

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  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)

Abstract

L’invention concerne un dispositif d’imagerie (1) par résonnance magnétique qui comprend un assemblage radiofréquence (7) configuré pour émettre et recevoir des signaux radiofréquence, l’assemblage radiofréquence comprenant : - une bobine radiofréquence (8) caractérisée pour une bande passante intrinsèque et une fréquence de résonance intrinsèque, et destinée à émettre et recevoir des signaux radiofréquence ; - un circuit accordable (9), associé à la bobine radiofréquence (8), et configuré pour permettre l’ajustement de l’impédance équivalente de l’assemblage radiofréquence dans une gamme d’impédance donnée, l’ajustement de l’impédance équivalente permettant d’ajuster la fréquence de résonnance, dite fréquence ajustée, et la bande passante, dite bande ajustée, de l’assemblage radiofréquence (7), la fréquence ajustée et la bande ajustée étant chacune comprises dans la bande passante intrinsèque de sorte que l’assemblage radiofréquence (7) présente un facteur de qualité supérieur au facteur de qualité de la bobine radiofréquence (8) prise seule. Figur e 1
FR2111501A 2021-10-28 2021-10-28 dispositif d’imagerie par résonance magnétique Active FR3128781B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR2111501A FR3128781B1 (fr) 2021-10-28 2021-10-28 dispositif d’imagerie par résonance magnétique
PCT/FR2022/052002 WO2023073311A1 (fr) 2021-10-28 2022-10-21 Dispositif d'imagerie par resonance magnetique et procede d'acquisition d'une image par resonance magnetique

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR2111501A FR3128781B1 (fr) 2021-10-28 2021-10-28 dispositif d’imagerie par résonance magnétique
FR2111501 2021-10-28

Publications (2)

Publication Number Publication Date
FR3128781A1 FR3128781A1 (fr) 2023-05-05
FR3128781B1 true FR3128781B1 (fr) 2023-10-27

Family

ID=80446878

Family Applications (1)

Application Number Title Priority Date Filing Date
FR2111501A Active FR3128781B1 (fr) 2021-10-28 2021-10-28 dispositif d’imagerie par résonance magnétique

Country Status (2)

Country Link
FR (1) FR3128781B1 (fr)
WO (1) WO2023073311A1 (fr)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITUB20155325A1 (it) 2015-10-26 2017-04-28 Sotgiu Antonello Magnete per diagnostica clinica tramite risonanze magnetiche (MRI) composto da anelli cilindrici di tipo Halbach: modalita di costruzione e tecniche per rendere omogeneo il campo magnetico in una larga frazione del volume interno del magnete.
US10473737B2 (en) * 2017-08-18 2019-11-12 Synaptive Medical (Barbados) Inc. Active switching for RF slice-selecting

Also Published As

Publication number Publication date
FR3128781A1 (fr) 2023-05-05
WO2023073311A1 (fr) 2023-05-04

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Effective date: 20230505

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CD Change of name or company name

Owner name: MULTIWAVE TECHNOLOGIES, FR

Effective date: 20240307