Copyright © 2004 Elsevier Inc. All rights reserved.
Communication
Spatially varying steady state longitudinal magnetization in distant dipolar field-based sequences
Received 1 April 2004;
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Abstract
Sequences based on the distant dipolar field (DDF) have shown great promise for novel spectroscopy and imaging. Unless spatial variation in the longitudinal magnetization, Mz(s), is eliminated by relaxation, diffusion, or spoiling techniques by the end of a single repetition, unexpected results can be obtained due to spatial harmonics in the steady state profile. This is true even in a homogeneous single-component sample. We have developed an analytical expression for the
profile that occurs in DDF sequences when smearing by diffusion is negligible in the TR period. The expression has been verified by directly imaging the
profile after establishing the steady state.
Keywords: Distant dipolar field; DDF; Intermolecular multiple quantum coherence; iMQC; Steady state longitudinal magnetization
PACS: 82.56.Jn; 82.56.Na; 87.61.Cd






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