Correction of motional artifacts in diffusion-weighted MR images using navigator echoes.
Patient motion can seriously degrade the quality of diffusion-weighted MR images obtained using standard 2DFT imaging procedures. The main source of error arises from an MR signal phase-shift error which is proportional to the magnitude of the motion. A modified pulse sequence is proposed which uses the phase information from an additional spin echo to correct for patient motion. Application of this technique is demonstrated for a human brain study, which greatly improves the quantification of diffusion values from regions of brain tissue.
Ordidge
R J
RJ
NIH Center for Stroke Research, Department of Neurology, Henry Ford Health Sciences Center, Detroit, MI 48202.
Helpern
J A
JA
Qing
Z X
ZX
Knight
R A
RA
Nagesh
V
V
D016477:Artifacts; D001921:Brain / Q000033:anatomy & histology; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D009068:Movement