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Generalized GRAPPA operators for wider spiral bands: Rapid self‐calibrated parallel reconstruction for variable density spiral MRI
Author(s) -
Lin Wei,
Börnert Peter,
Huang Feng,
Duensing George R.,
Reykowski Arne
Publication year - 2011
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.22900
Subject(s) - spiral (railway) , operator (biology) , calibration , sampling (signal processing) , line (geometry) , computer science , algorithm , variable (mathematics) , acceleration , set (abstract data type) , physics , mathematics , optics , mathematical analysis , geometry , detector , statistics , repressor , biochemistry , chemistry , classical mechanics , transcription factor , gene , programming language
A rapid and self‐calibrated parallel imaging reconstruction method is proposed for undersampled variable density spiral datasets. A set of generalized GRAPPA for wider readout line operators are used to expand each acquired spiral line into a wider spiral band, therefore fulfilling Nyquist sampling criterion throughout the k ‐space. The calibration of generalized GRAPPA for wider readout line operators is performed using the fully sampled central k ‐space region. The resulting generalized GRAPPA for wider readout line operator weights are adaptively regularized to minimize the error in the newly‐generated data at different k ‐space locations. Simulation and experimental results demonstrate that the technique can be used either to achieve a significant acceleration and/or to reduce off‐resonance artifacts due to a shorten readout duration. Magn Reson Med, 2011. © 2011 Wiley‐Liss, Inc.