title: T2* mapping with background gradient correction using different excitation pulse shapes.
abstract: Background gradients induced by magnetic susceptibility variations near air-filled cavities in the brain cause signal-intensity loss in gradient-echo images and shorten T2* considerably. With a correction method in which the exponential decay is restored with section-profile-dependent correction factors, parts of the signal intensity can be recovered. While uncorrected T2* values drop by 20% at a gradient strength of 75 μT/m, with correction and exponential excitation pulses, this boundary is pushed to 220 μT/m.
authors: Departments of Neuroradiology, Technische Universität München, Munich, Germany. nuria.hirsch@tum.de
authors: N M
authors: NM
authors: Hirsch
authors: C
authors: C
authors: Preibisch
mesh_terms: D016477:Artifacts; D017352:Echo-Planar Imaging / Q000379:methods*; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D008962:Models, Theoretical; D010300:Parkinson Disease / Q000473:pathology*