PT - JOURNAL ARTICLE AU - N.M. Hirsch AU - C. Preibisch TI - T2* Mapping with Background Gradient Correction Using Different Excitation Pulse Shapes AID - 10.3174/ajnr.A3021 DP - 2013 Jun 01 TA - American Journal of Neuroradiology PG - E65--E68 VI - 34 IP - 6 4099 - http://www.ajnr.org/content/34/6/E65.short 4100 - http://www.ajnr.org/content/34/6/E65.full SO - Am. J. Neuroradiol.2013 Jun 01; 34 AB - SUMMARY: 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.