Tailored RF Pulse for Magnetization Inversion at Ultrahigh Field
Aaron C Hurley, Ali Al-Radaideh, Li Bai, Uwe Aickelin, Ron Coxon, Paul Glover, Penny A Gowland
MAGNETIC RESONANCE IN MEDICINE | WILEY | Published : 2010
The radiofrequency (RF) transmit field is severely inhomogeneous at ultrahigh field due to both RF penetration and RF coil design issues. This particularly impairs image quality for sequences that use inversion pulses such as magnetization prepared rapid acquisition gradient echo and limits the use of quantitative arterial spin labeling sequences such as flow-attenuated inversion recovery. Here we have used a search algorithm to produce inversion pulses tailored to take into account the heterogeneity of the RF transmit field at 7 T. This created a slice selective inversion pulse that worked well (good slice profile and uniform inversion) over the range of RF amplitudes typically obtained in ..View full abstract
Awarded by Medical Research Council
This work was funded by the Medical Research Council, UK. The University of Nottingham 7-T scanner was originally funded by Wellcome Trust, the Office of Science and Technology and the Higher Education Funding Council for England.