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Time-zero signal truncation in CRAZED experiments due to rephasing gradient delays leads to incorrect frequency-domain lineshapes

S. Kirsch and W. Hull

Proceedings 16th Scientific Meeting, International Society for Magnetic Resonance in Medicine, Toronto,, p.1562

In contrast to the decay of a conventional pulse-acquire FID, the time-domain signal from of a CRAZED-type pulse sequence for coherence order n > 1 increases from initially zero to a maximum, followed by an exponential decay. We show that the finite duration of the coherence rephasing gradient and any subsequent recovery delays lead to loss of the initial portion of the time-domain signal. This so-called â??time-zero truncation artefactâ?? results in an altered frequency-domain lineshape with incorrect integral and linewidth. Correct analysis requires time-domain fitting of right-shifted data.

Contact: Prof. Dr. Frank Zöllner last modified: 22.01.2019
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