Ultra-high-field MRI using composite RF (STEP) pulses.
Ultra-high field MRI offers many opportunities to expand the applications of MRI. In order for this to be realized, the technical problems associated with MRI at field strengths of 7 T and greater need to be solved or mitigated. This paper explores the use of new variations of composite RF pulses, named serial transmit excitation pulses (STEP), in contrast to parallel pulse techniques, in order to remove and/or mitigate the effects of non-uniform B1 excitation fields associated with the subject (eg the human brain). Several techniques based on STEP sequences are introduced and their application to human brain imaging is presented and evaluated.
['Ordidge|Roger|R|0000-0002-1005-3654', 'Cleary|Jon|J|', 'Glarin|Rebecca|R|', 'Blunck|Yasmin|Y|', 'Farquharson|Shawna|S|', 'Moffat|Bradford|B|0000-0002-0278-4801']
D000465:Algorithms D003198:Computer Simulation D004867:Equipment Design D008279:Magnetic Resonance Imaging D059906:Neuroimaging D011846:Radio Waves
ultra-high field brain imaging B0 inhomogeneity correction B1 inhomogeneity correction RF pulse design other applications