T2* MAPPING WITH BACKGROUND GRADIENT CORRECTION USING DIFFERENT EXCITATION PULSE SHAPES
N.M. Hirsch and C. Preibisch. (26-07-2012).
American Journal of Neuroradiology (AJNR 2013 34: E65-E68), 2012, DOI 10.3174/ajnr.A3021Department:
Research Area B
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 220µT/m.
