Processing

Please wait...

Settings

Settings

Goto Application

1. WO2011116785 - METHOD AND DEVICE FOR RECONSTRUCTING A SEQUENCE OF MR IMAGES USING A REGULARIZED NONLINEAR INVERSE RECONSTRUCTION PROCESS

Publication Number WO/2011/116785
Publication Date 29.09.2011
International Application No. PCT/EP2010/001814
International Filing Date 23.03.2010
IPC
G01R 33/561 2006.1
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
561by reduction of the scanning time, i.e. fast acquiring systems, e.g. using echo-planar pulse sequences
CPC
G01R 33/246
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
246Spatial mapping of the RF magnetic field B1
G01R 33/4824
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
4818MR characterised by data acquisition along a specific k-space trajectory or by the temporal order of k-space coverage, e.g. centric or segmented coverage of k-space
4824using a non-Cartesian trajectory
G01R 33/5608
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
5608Data processing and visualization specially adapted for MR, e.g. for feature analysis and pattern recognition on the basis of measured MR data, segmentation of measured MR data, edge contour detection on the basis of measured MR data, for enhancing measured MR data in terms of signal-to-noise ratio by means of noise filtering or apodization, for enhancing measured MR data in terms of resolution by means for deblurring, windowing, zero filling, or generation of gray-scaled images, colour-coded images or images displaying vectors instead of pixels
G01R 33/5611
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
561by reduction of the scanning time, i.e. fast acquiring systems, e.g. using echo-planar pulse sequences
5611Parallel magnetic resonance imaging, e.g. sensitivity encoding [SENSE], simultaneous acquisition of spatial harmonics [SMASH], unaliasing by Fourier encoding of the overlaps using the temporal dimension [UNFOLD], k-t-broad-use linear acquisition speed-up technique [k-t-BLAST], k-t-SENSE
G01R 33/56308
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
Applicants
  • MAX-PLANCK-GESELLSCHAFT ZUR FÖRDERUNG DER WISSENSCHAFTEN E.V. [DE]/[DE] (AllExceptUS)
  • FRAHM, Jens [DE]/[DE] (UsOnly)
  • UECKER, Martin [DE]/[DE] (UsOnly)
  • ZHANG, Shuo [CN]/[DE] (UsOnly)
Inventors
  • FRAHM, Jens
  • UECKER, Martin
  • ZHANG, Shuo
Agents
  • HERTZ, Oliver
Priority Data
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) METHOD AND DEVICE FOR RECONSTRUCTING A SEQUENCE OF MR IMAGES USING A REGULARIZED NONLINEAR INVERSE RECONSTRUCTION PROCESS
(FR) PROCÉDÉ ET DISPOSITIF DE RECONSTRUCTION D'UNE SÉQUENCE D'IMAGES RM AU MOYEN D'UN PROCESSUS DE RECONSTRUCTION INVERSÉE, NON LINÉAIRE ET RÉGULARISÉE
Abstract
(EN) A method for reconstructing a sequence of magnetic resonance (MR) images of an object under investigation, comprises the steps of (a) providing a series of sets of image raw data including an image content of the MR images to be reconstructed, said image raw data being collected with the use of at least one radiofrequency receiver coil of a magnetic resonance imaging (MRI) device, wherein each set of image raw data includes a plurality of data sampies being generated with a gradient-echo sequence, in particular a FLASH sequence, that spatially encodes an MRl signal received with the at least one radiofrequency receiver coil using a non-Cartesian k-space trajectory, each set of image raw data comprises a set of homogeneously distributed lines in k-space with equivalent spatial frequency content, the lines of each set of image raw data cross the center of k-space and cover a continuous range of spatial frequencies, and the positions of the lines of each set of image raw data differ in successive sets of image raw data, and (b) subjecting the sets of image raw data to a regularized nonlinear inverse reconstruction process to provide the sequence of MR images, wherein each of the MR images is created by a simultaneous estimation of a sensitivity of the at least one receiver coil and the image content and in dependency on a difference between a current estimation of the sensitivity of the at least one receiver coil and the image content and a preceding estimation of the sensitivity of the at least one receiver coil and the image content.
(FR) L'invention concerne un procédé de reconstruction d'une séquence d'images par résonance magnétique (RM) d'un objet étudié, le procédé comprenant l'étape (a) consistant à obtenir une série d'ensembles de données brutes d'images comprenant un contenu d'image des images RM à reconstruire, lesdites données brutes d'images étant collectées au moyen d'au moins une bobine de récepteur radiofréquence d'un dispositif d'imagerie par résonance magnétique (IRM), chaque ensemble de données brutes d'image comprenant une pluralité d'échantillons de données générés avec une séquence d'écho de gradient, en particulier une séquence FLASH, qui code spatialement un signal IRM reçu par la ou les bobines de récepteur radiofréquence en utilisant une trajectoire non cartésienne dans l'espace k, chaque ensemble de données brutes d'images comprenant un ensemble de lignes distribuées de manière homogène dans l'espace k ayant un contenu équivalent en termes de fréquence spatiale, les lignes de chaque ensemble de données brutes d'images croisant le centre de l'espace k et couvrant une gamme continue de fréquences spatiales, et les positions des lignes de chaque ensemble de données brutes d'images étant différentes dans des ensembles successifs de données brutes d'images, et l'étape (b) consistant à soumettre les ensembles de données brutes d'images à un processus de reconstruction inversée, non linéaire et régularisée pour obtenir la séquence d'images RM, chacune des images RM étant créée par une estimation simultanée d'une sensibilité de la bobine ou des bobines de récepteur et du contenu d'image et en fonction d'une différence entre une estimation actuelle de la sensibilité de la bobine ou des bobines de récepteur et du contenu d'image et d'une estimation précédente de la sensibilité de la bobine ou des bobines de récepteur et du contenu d'image.
Related patent documents
Latest bibliographic data on file with the International Bureau