title: Fast undersampled functional magnetic resonance imaging using nonlinear regularized parallel image reconstruction.
abstract: In this article we aim at improving the performance of whole brain functional imaging at very high temporal resolution (100 ms or less). This is achieved by utilizing a nonlinear regularized parallel image reconstruction scheme, where the penalty term of the cost function is set to the L(1)-norm measured in some transform domain. This type of image reconstruction has gained much attention recently due to its application in compressed sensing and has proven to yield superior spatial resolution and image quality over e.g. Tikhonov regularized image reconstruction. We demonstrate that by using nonlinear regularization it is possible to more accurately localize brain activation from highly undersampled k-space data at the expense of an increase in computation time.
authors.affiliation: Medical Physics, Department of Radiology, University Medical Center Freiburg, Freiburg, Germany.
authors.forename: Thimo
authors.initials: T
authors.lastname: Hugger
authors.forename: Benjamin
authors.initials: B
authors.lastname: Zahneisen
authors.forename: Pierre
authors.initials: P
authors.lastname: LeVan
authors.forename: Kuan Jin
authors.initials: KJ
authors.lastname: Lee
authors.forename: Hsu-Lei
authors.initials: HL
authors.lastname: Lee
authors.forename: Maxim
authors.initials: M
authors.lastname: Zaitsev
authors.forename: Jürgen
authors.initials: J
authors.lastname: Hennig
mesh_terms: D001931:Brain Mapping; D003198:Computer Simulation; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D017711:Nonlinear Dynamics; D013997:Time Factors