Correction Accuracy in B1 measurement for high field Image Intensity Correction
Kabasawa H, Li Z, Guclu C
GE Yokogawa Medical Systems
To correct for image non-uniformity caused by dielectric effect, in-vivo B1 mapping-based image correction methods were recently presented. The B1 field or flip angle (FA) field map may be perturbed due to various reasons including susceptibility artifact, tissue relaxation parameters, etc.. To reduce the sensitivity to these measurement errors, a simulation analysis was performed to characterize noise variation in the B1 map. Then a novel B1 field estimation and filtering method was proposed based on the simulation results. The proposed method effectively suppressed artifact caused by B1 measurement inaccuracy.