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Delayed‐focus pulses for magnetic resonance imaging: An evolutionary approach
Author(s) -
Wu XiLi,
Xu Ping,
Freeman Ray
Publication year - 1991
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.1910200118
Subject(s) - focus (optics) , excitation , precession , nuclear magnetic resonance , physics , magnetic resonance imaging , signal (programming language) , resonance (particle physics) , mode (computer interface) , absorption (acoustics) , computer science , optics , atomic physics , computational physics , condensed matter physics , quantum mechanics , medicine , radiology , programming language , operating system
An evolutionary algorithm has been used to design a family of shaped radiofrequency pulses giving uniform absorption‐mode excitation across a predetermined frequency band. By allowing a free precession interval before signal acquisition, time is left for field gradients to be switched and for undesirable transients to decay. © 1991 Academic Press, Inc.