title: Automatic high-bandwidth calibration and reconstruction of arbitrarily sampled parallel MRI.
abstract: Today, many MRI reconstruction techniques exist for undersampled MRI data. Regularization-based techniques inspired by compressed sensing allow for the reconstruction of undersampled data that would lead to an ill-posed reconstruction problem. Parallel imaging enables the reconstruction of MRI images from undersampled multi-coil data that leads to a well-posed reconstruction problem. Autocalibrating pMRI techniques encompass pMRI techniques where no explicit knowledge of the coil sensivities is required. A first purpose of this paper is to derive a novel autocalibration approach for pMRI that allows for the estimation and use of smooth, but high-bandwidth coil profiles instead of a compactly supported kernel. These high-bandwidth models adhere more accurately to the physics of an antenna system. The second purpose of this paper is to demonstrate the feasibility of a parameter-free reconstruction algorithm that combines autocalibrating pMRI and compressed sensing. Therefore, we present several techniques for automatic parameter estimation in MRI reconstruction. Experiments show that a higher reconstruction accuracy can be had using high-bandwidth coil models and that the automatic parameter choices yield an acceptable result.
authors.affiliation: IPI-TELIN-IMINDS, Ghent University, Ghent, Belgium.
authors.forename: Jan
authors.initials: J
authors.lastname: Aelterman
authors.affiliation: BIO-IMAGING Lab, University of Antwerp, Antwerp, Belgium.
authors.forename: Maarten
authors.initials: M
authors.lastname: Naeyaert
authors.affiliation: MEDISIP-ELIS-IMINDS, Ghent University, Ghent, Belgium.
authors.forename: Shandra
authors.initials: S
authors.lastname: Gutierrez
authors.affiliation: IPI-TELIN-IMINDS, Ghent University, Ghent, Belgium.
authors.forename: Hiep
authors.initials: H
authors.lastname: Luong
authors.affiliation: IPI-TELIN-IMINDS, Ghent University, Ghent, Belgium.
authors.forename: Bart
authors.initials: B
authors.lastname: Goossens
authors.affiliation: IPI-TELIN-IMINDS, Ghent University, Ghent, Belgium.
authors.forename: Aleksandra
authors.initials: A
authors.lastname: Pižurica
authors.affiliation: IPI-TELIN-IMINDS, Ghent University, Ghent, Belgium.
authors.forename: Wilfried
authors.initials: W
authors.lastname: Philips
mesh_terms: D000465:Algorithms; D002138:Calibration; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D008279:Magnetic Resonance Imaging / Q000379:methods; D008962:Models, Theoretical