title: Correction of motional artifacts in diffusion-weighted MR images using navigator echoes.
abstract: 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.
authors.affiliation: NIH Center for Stroke Research, Department of Neurology, Henry Ford Health Sciences Center, Detroit, MI 48202.
authors.forename: R J
authors.initials: RJ
authors.lastname: Ordidge
authors.forename: J A
authors.initials: JA
authors.lastname: Helpern
authors.forename: Z X
authors.initials: ZX
authors.lastname: Qing
authors.forename: R A
authors.initials: RA
authors.lastname: Knight
authors.forename: V
authors.initials: V
authors.lastname: Nagesh
mesh_terms: D016477:Artifacts; D001921:Brain / Q000033:anatomy & histology; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D009068:Movement