Mathematics – Optimization and Control
Scientific paper
2009-09-02
Mathematics
Optimization and Control
Scientific paper
To reduce scanning time and/or improve spatial/temporal resolution in some MRI applications, parallel MRI (pMRI) acquisition techniques with multiple coils acquisition have emerged since the early 1990s as powerful 3D imaging methods that allow faster acquisition of reduced Field of View (FOV) images. In these techniques, the full FOV image has to be reconstructed from the resulting acquired undersampled k-space data. To this end, several reconstruction techniques have been proposed such as the widely-used SENSE method. However, the reconstructed image generally presents artifacts when perturbations occur in both the measured data and the estimated coil sensitivity maps. In this paper, we aim at achieving good reconstructed image quality when using low magnetic field and high reduction factor. Under these severe experimental conditions, neither the SENSE method nor the Tikhonov regularization in the image domain give convincing results. To this aim, we present a novel method for SENSE-based reconstruction which proceeds with regularization in the complex wavelet domain. To further enhance the reconstructed image quality, local convex constraints are added in the regularization process. In vivo experiments carried out on Gradient-Echo (GRE) anatomical and Echo-Planar Imaging (EPI) functional MRI data at 1.5 Tesla indicate that the proposed algorithm provides reconstructed images with reduced artifacts for high reduction factor.
Benazza-Benyahia Amel
Chaari Lotfi
Ciuciu Philippe
Pesquet Jean-Christophe
No associations
LandOfFree
An Iterative Method for Parallel MRI SENSE-based Reconstruction in the Wavelet Domain does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with An Iterative Method for Parallel MRI SENSE-based Reconstruction in the Wavelet Domain, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and An Iterative Method for Parallel MRI SENSE-based Reconstruction in the Wavelet Domain will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-12239