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Theory of Localized Polarization Transfer
Author(s) -
Pegg David T.,
Robin BENDALL M.
Publication year - 1985
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.1910020505
Subject(s) - polarization (electrochemistry) , excitation , physics , inverse , excited state , homogeneous , nuclear magnetic resonance , induced polarization , computational physics , optics , chemistry , atomic physics , mathematics , statistical physics , quantum mechanics , geometry , electrical resistivity and conductivity
Because polarization transfer from one type of nucleus to another can occur only when both types of nuclei are excited, it is possible, by using two separate rf coils for the excitation, to restrict the spatial region of the sample from which a signal can be received to a specific volume of overlap of the two inhomogeneous field patterns. In this paper we develop the theory of this method of localization in a homogeneous static field. The polarization transfer is achieved by a generalized phase‐cycled DEPT sequence, in which case the method has the additional advantage of a gain in sensitivity of a 13 C signal associated with the maximum polarization‐transfer enhancement. Localization by means of the inverse‐DEPT sequence is also studied, and off‐resonance effects are calculated. Experimental confirmation of the theoretical expressions is given.© 1985 Academic Press,Inc.