Abstract
The time evolution of the transverse magnetization in Carr-Purcell sequences in the presence of fast chemical exchange is calculated using perturbation theory in an interaction representation that removes external parts from the Hamiltonian. The method is more general than the use of the extended Bloch equations, as it in principle allows incorporation of other relaxation mechanisms apart from exchange into the fluctuating Hamiltonian. The Luz-Meiboom equation is shown to be valid in a wider range of exchange times and pulse spacings than proposed formerly. The case of a spin I having a heteronuclear scalar coupling to a spin S is treated. It is shown how the influence of S relaxation can be taken into account.
Published Version
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