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1. WO2020198631 - MULTI-SHOT ECHO PLANAR IMAGING USING REORDERED SEGMENTS AND RECURSIVE RADIO FREQUENCY PULSE DESIGN GIVING MATCHED SLICE PROFILES ACROSS SEGMENTS

Publication Number WO/2020/198631
Publication Date 01.10.2020
International Application No. PCT/US2020/025345
International Filing Date 27.03.2020
IPC
A61B 5/055 2006.01
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
5Measuring for diagnostic purposes; Identification of persons
05Measuring for diagnosis by means of electric currents or magnetic fields
055involving electronic or nuclear magnetic resonance, e.g. magnetic resonance imaging
G01R 33/24 2006.01
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33Arrangements or instruments for measuring magnetic variables
20involving magnetic resonance
24for measuring direction or magnitude of magnetic fields or magnetic flux
G01R 33/48 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
G01R 33/483 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
483with selection of signal or spectra from particular regions of the volume, e.g. in vivo spectroscopy
G01R 33/54 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
G01R 33/56 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
Applicants
  • THE GENERAL HOSPITAL CORPORATION [US]/[US]
  • VANDERBILT UNIVERSITY [US]/[US]
Inventors
  • BERMAN, Avery, J.L.
  • POLIMENI, Jonathan, R.
  • GRISSOM, William, A.
  • GRISSOM, William, A
  • SETSOMPOP, Kawin
  • WITZEL, Thomas
Agents
  • STONE, Jonathan D.
Priority Data
62/824,58927.03.2019US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) MULTI-SHOT ECHO PLANAR IMAGING USING REORDERED SEGMENTS AND RECURSIVE RADIO FREQUENCY PULSE DESIGN GIVING MATCHED SLICE PROFILES ACROSS SEGMENTS
(FR) IMAGERIE PLANAIRE À ÉCHOS MULTIPLES FAISANT APPEL À DES SEGMENTS RÉORDONNÉS ET À UNE CONCEPTION D'IMPULSIONS RADIOFRÉQUENCES RÉCURSIVES DONNANT DES PROFILS DE TRANCHES APPARIÉS ENTRE SEGMENTS
Abstract
(EN)
Described here are systems and methods for producing images with a magnetic resonance imaging ("MRI") system using a high-resolution, motion-robust, artifact-free segmented echo planar imaging ("EPI") technique. In particular, a fast low angle excitation echo planar imaging technique ("FLEET") using variable flip angle ("VFA") radio frequency ("RF") excitation pulses that are recursively designed to have a flat magnitude and phase profile across a slice for a range of different flip angles by accounting for longitudinal magnetization remaining after each preceding RF pulse is applied.
(FR)
L'invention concerne des systèmes et des procédés de production d'images à l'aide d'un système d'imagerie par résonance magnétique ("IRM") faisant appel à une technique d'imagerie planaire à échos segmentés, sans artefact, robuste par rapport au mouvement et haute résolution ("EPI"). En particulier, l'invention concerne l'application d'une technique d'imagerie planaire à échos d'excitation à faible angle rapide ("FLEET") au moyen d'impulsions d'excitation radiofréquence ("RF") à angle de bascule variable ("VFA") qui sont conçues de manière récursive pour avoir un profil d'amplitude et de phase plat sur une tranche d'une plage d'angles de bascule différents en tenant compte de la magnétisation longitudinale résiduelle après chaque impulsion RF précédente.
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