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An adjustable adiabatic pulse for selective population inversion
Author(s) -
Mitschang Lorenz
Publication year - 2005
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.20454
Subject(s) - adiabatic process , amplitude , broadband , inversion (geology) , population inversion , physics , population , bandwidth (computing) , computational physics , optics , pulse duration , nuclear magnetic resonance , acoustics , computer science , telecommunications , geology , quantum mechanics , paleontology , laser , demography , structural basin , sociology
A new adiabatic inversion pulse and its design principles are presented. An analytical expression in the pulse length, inversion bandwidth, inversion efficiency, peak RF amplitude, and width of the transition region is derived and validated. Accordingly, the pulse shape can be adapted to achieve a specified inversion performance. Adjusted for broadband application, population can be inverted band selectively, rather independently of spatial RF field inhomogeneities, and with significantly reduced peak RF amplitude in comparison with the well‐known hyperbolic secant adiabatic pulse. Magn Reson Med 53:1217–1222, 2005. © 2005 Wiley‐Liss, Inc.