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1. WO2020216668 - MRI WITH MATCHING STATES OF VIBRATION

Publication Number WO/2020/216668
Publication Date 29.10.2020
International Application No. PCT/EP2020/060673
International Filing Date 16.04.2020
IPC
G01R 33/565 2006.01
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33Arrangements or instruments for measuring magnetic variables
20involving magnetic resonance
44using nuclear magnetic resonance
48NMR imaging systems
54Signal processing systems, e.g. using pulse sequences
56Image enhancement or correction, e.g. subtraction or averaging techniques
565Correction of image distortions, e.g. due to magnetic field inhomogeneities
G01R 33/563 2006.01
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33Arrangements or instruments for measuring magnetic variables
20involving magnetic resonance
44using nuclear magnetic resonance
48NMR imaging systems
54Signal processing systems, e.g. using pulse sequences
56Image enhancement or correction, e.g. subtraction or averaging techniques
563of moving material, e.g. flow-contrast angiography
CPC
G01R 33/56316
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33Arrangements or instruments for measuring magnetic variables
20involving magnetic resonance
44using nuclear magnetic resonance [NMR]
48NMR imaging systems
54Signal processing systems, e.g. using pulse sequences ; , Generation or control of pulse sequences
56Image enhancement or correction, e.g. subtraction or averaging techniques ; , e.g. improvement of signal-to-noise ratio and resolution
563of moving material, e.g. flow contrast angiography
56308Characterization of motion or flow; Dynamic imaging
56316involving phase contrast techniques
G01R 33/56341
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33Arrangements or instruments for measuring magnetic variables
20involving magnetic resonance
44using nuclear magnetic resonance [NMR]
48NMR imaging systems
54Signal processing systems, e.g. using pulse sequences ; , Generation or control of pulse sequences
56Image enhancement or correction, e.g. subtraction or averaging techniques ; , e.g. improvement of signal-to-noise ratio and resolution
563of moving material, e.g. flow contrast angiography
56341Diffusion imaging
G01R 33/56358
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33Arrangements or instruments for measuring magnetic variables
20involving magnetic resonance
44using nuclear magnetic resonance [NMR]
48NMR imaging systems
54Signal processing systems, e.g. using pulse sequences ; , Generation or control of pulse sequences
56Image enhancement or correction, e.g. subtraction or averaging techniques ; , e.g. improvement of signal-to-noise ratio and resolution
563of moving material, e.g. flow contrast angiography
56358Elastography
G01R 33/56518
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33Arrangements or instruments for measuring magnetic variables
20involving magnetic resonance
44using nuclear magnetic resonance [NMR]
48NMR imaging systems
54Signal processing systems, e.g. using pulse sequences ; , Generation or control of pulse sequences
56Image enhancement or correction, e.g. subtraction or averaging techniques ; , e.g. improvement of signal-to-noise ratio and resolution
565Correction of image distortions, e.g. due to magnetic field inhomogeneities
56518due to eddy currents, e.g. caused by switching of the gradient magnetic field
Applicants
  • KONINKLIJKE PHILIPS N.V. [NL]/[NL]
Inventors
  • WEIDLICH, Dominik, Johannes
  • RUSCHKE, Stefan
  • KARAMPINOS, Dimitrios
  • HOCK, Andreas
Agents
  • PHILIPS INTELLECTUAL PROPERTY & STANDARDS
Priority Data
19171084.725.04.2019EP
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) MRI WITH MATCHING STATES OF VIBRATION
(FR) IRM À ÉTATS DE VIBRATION CORRESPONDANTS
Abstract
(EN)
The invention relates to a magnetic resonance system (100) configured for acquiring magnetic resonance data from a subject (118). Execution of the machine executable instructions (140) stored in a memory (134) causes a processor (130) to control the magnetic resonance system (100) using a set of waveform and pulse sequence commands (142, 152) to prepare a first state of vibration (211) of the one or more hardware elements and / or the subject (118). The preparing comprises generating the vibration matching gradient (200) inducing the first vibrations (210) of the one or more hardware elements and /or the subject (118), while the net magnetization vector of the subject (118) is aligned along the longitudinal axis of the main magnetic field. The magnetic resonance system (100) is further controlled to acquire the magnetic resonance data (144, 154) according to a magnetic resonance protocol. The acquiring comprises generating in sequence at least two spin manipulating gradients (202, 204) for manipulating phases of nuclear spins within the subject (118), while the net magnetization vector of the subject (118) comprises a non-vanishing component in a transverse plane perpendicular to the longitudinal axis of the main magnetic field. A first one of the at least two spin manipulating gradients (202) is generated during the first state of vibration (211) and a second one of the at least two spin manipulating gradients (204) is generated during a second state of vibration (213) of the one or more hardware elements and / or the subject (118). The vibration matching gradient (200) is used for matching with the first state of vibration (211) the second state of vibration (213).
(FR)
L'invention porte sur un système de résonance magnétique (100) conçu pour acquérir des données de résonance magnétique à partir d’un sujet (118). L'exécution des instructions exécutables par machine (140) stockées dans une mémoire (134) amène un processeur (130) à commander le système de résonance magnétique (100) à l'aide d'un ensemble d'instructions de forme d'onde et de séquence d'impulsions (142, 152) pour préparer un premier état de vibration (211) du ou des éléments matériels et/ou du sujet (118). La préparation comprend la génération du gradient de correspondance de vibration (200) induisant les premières vibrations (210) du ou des éléments matériels et/ou du sujet (118), tandis que le vecteur de magnétisation nette du sujet (118) est aligné le long de l'axe longitudinal du champ magnétique principal. Le système de résonance magnétique (100) est en outre commandé pour acquérir les données de résonance magnétique (144, 154) selon un protocole de résonance magnétique. L'acquisition consiste à générer en séquence au moins deux gradients de manipulation de spin (202, 204) pour manipuler des phases de spins nucléaires à l'intérieur du sujet (118), tandis que le vecteur de magnétisation nette du sujet (118) comprend un composant non évanescent dans un plan transversal perpendiculaire à l'axe longitudinal du champ magnétique principal. Un premier des deux ou plus gradients de manipulation de spin (202) est généré pendant le premier état de vibration (211) et un second des deux ou plus gradients de manipulation de spin (204) est généré pendant un second état de vibration (213) du ou des éléments matériels et/ou du sujet (118). Le gradient d'adaptation de vibration (200) est utilisé pour la mise en correspondance avec le premier état de vibration (211) et le second état de vibration (213).
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