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Rapid repetition of the “burst” sequence: The role of diffusion and consequences for imaging
Author(s) -
Doran Simon J.,
Jakob Peter,
Décorps Michel
Publication year - 1996
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.1910350414
Subject(s) - spins , pulse (music) , pulse sequence , sequence (biology) , diffusion , nuclear magnetic resonance , magnetization , repetition (rhetorical device) , physics , signal (programming language) , materials science , optics , condensed matter physics , chemistry , computer science , quantum mechanics , magnetic field , biochemistry , linguistics , philosophy , detector , programming language
When the Burst pulse sequence (Hennig ef al. MAGMA 1, 39–48 (1993)) is applied with elementary pulses of finite flip angle, a non‐uniform longitudinal magnetization is created, in the form of a series of fine bands of saturated spins. Both during and after the pulse train, the molecules contained within these bands diffuse. In this paper a full description is given of the evolution of the non‐uniform longitudinal magnetization subsequent to the pulse train and the theory is verified experimentally. The value of the diffusion coefficient influences strongly the signal obtained when the Burst sequence is repeated rapidly. The consequences of this for imaging are discussed and, in particular, for the so‐called “frequency‐shifted” Burst technique.