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Radiofrequency power calibration for magnetic resonance imaging using signal phase as indicator
Author(s) -
Bosak Elyakim,
Schiff Joseph,
Kaplan Noam
Publication year - 1999
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/(sici)1522-2594(199903)41:3<474::aid-mrm8>3.0.co;2-k
Subject(s) - calibration , signal (programming language) , amplitude , magnetic resonance imaging , nuclear magnetic resonance , power (physics) , phase (matter) , signal averaging , physics , radio frequency , optics , computer science , telecommunications , radiology , medicine , signal transfer function , quantum mechanics , transmission (telecommunications) , analog signal , programming language
A novel radiofrequency (rf) power calibration method for the purpose of nuclear magnetic resonance excitations based on monitoring signal phase rather than signal amplitude is described theoretically and is demonstrated experimentally. This unique method enables the determination of rf power required for any desired tip angle in clinical magnetic resonance imaging procedures with an accuracy of 1–5%, essentially independent of motion, flow, slice variations, and/or T 1 and T 2 variations. The advantages of the new method are discussed and are compared with currently common, amplitude‐based calibration techniques. Magn Reson Med 1999;41:474–478, 1999. © 1999 Wiley‐Liss, Inc.