Efficient off-resonance correction for spiral imaging.
A new spiral imaging technique incorporates the acquisition of a field map into imaging interleaves. Variable density spiral trajectories are designed to oversample the central region of k-space, and interleaves are acquired at two different echo times. A field map is extracted from this data and multifrequency reconstruction is used to form an off-resonance corrected image using the entire dataset. Simulation, phantom, and in vivo results indicate that this technique can be used to achieve higher image and/or field map spatial resolution compared to conventional techniques. Magn Reson Med 45:521-524, 2001.
Nayak
K S
KS
Department of Electrical Engineering, Stanford University, Stanford, California 94305-9510, USA. nayak@lad.stanford.edu
Tsai
C M
CM
Meyer
C H
CH
Nishimura
D G
DG
D016477:Artifacts; D003331:Coronary Vessels / Q000473:pathology; D004562:Electrocardiography; D006801:Humans; D007089:Image Enhancement; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging / Q000379:methods*; D019047:Phantoms, Imaging; D012016:Reference Values