Spiral readout gradients for the reduction of motion artifacts in chemical shift imaging.
A motion artifact reduction method for proton chemical shift imaging (CSI) is presented. The method uses spiral-based readout gradients for data acquisition. A characteristic of spiral-based readout gradients is that data are repeatedly sampled at the kxy origin. These data points are used to estimate and correct for motion-induced phase variations. Both phantom and in vivo spectra reconstructed using the new motion artifact reduction algorithm showed significant signal-to-noise ratio (SNR) improvements as compared to uncorrected data.
Radiological Sciences Laboratory, Department of Radiology, Stanford University, Stanford, California, USA. dhkim@stanford.edu
Dong-Hyun
DH
Kim
Elfar
E
Adalsteinsson
Daniel M
DM
Spielman
D000465:Algorithms; D016477:Artifacts; D001923:Brain Chemistry; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging / Q000379:methods*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D009038:Motion; D019047:Phantoms, Imaging; D012815:Signal Processing, Computer-Assisted