Fast-k<inf>z</inf> three-dimensional tailored radiofrequency pulse for reduced B<inf>1</inf> inhomogeneity

• Main Authors: Suwit Saekho, Chun Yu Yip, Douglas C. Noll, Fernando E. Boada, V. Andrew Stenger
• 格式: 雜誌
• 出版: 2018
• 主題: Medicine
• 在線閱讀: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=33645755826&origin=inward; http://cmuir.cmu.ac.th/jspui/handle/6653943832/61885
• 機構: Chiang Mai University

This article presents a small-flip-angle, three-dimensional tailored RF pulse that excites thin slices with an adjustable quadratic in-plane spatial variation. The quadratic spatial variation helps to compensate for the loss in image uniformity using a volume coil at 3 T due to the wavelike properties of the RF field. The pulse is based on a novel "fast-kz" design that uses a series of slice-select subpulses along kz and phase encoding "blips" along kx-ky. The method is demonstrated by acquiring a series of 5-mm-thick T2-weighted images of the human brain at 3 T using pulses 4.8 ms in length with a 45 ° flip angle. © 2006 Wiley-Liss, Inc.