Assessing signal enhancement in distant dipolar field-based sequences

Journal of Magnetic Resonance

Volumn 189, Issue 1, 2007, Pages 32-37

  Barros Jr , Wilson ^a   Gochberg, Daniel F ^a   Gore, John C ^a  

^a VANDERBILT UNIVERSITY MEDICAL CENTER   (United States)

Author keywords

CRAZED; Distant dipolar field; Intermolecular multiple quantum coherences; Long range dipolar interactions; Signal enhancement; Stimulated echo

Indexed keywords

COMPUTATIONAL METHODS; NUCLEAR MAGNETIC RESONANCE; SENSITIVITY ANALYSIS; SIGNAL DETECTION; SIGNAL TO NOISE RATIO;

DISTANT DIPOLAR FIELD; INTERMOLECULAR MULTIPLE-QUANTUM COHERENCES; LONG-RANGE DIPOLAR INTERACTIONS; SIGNAL ENHANCEMENT; STIMULATED ECHO;

SIGNAL ANALYSIS;

ALGORITHM; ARTICLE; ELECTROMAGNETIC FIELD; IMAGE PROCESSING; METHODOLOGY; NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY; STATISTICAL MODEL;

ALGORITHMS; ELECTROMAGNETIC FIELDS; IMAGE PROCESSING, COMPUTER-ASSISTED; MAGNETIC RESONANCE SPECTROSCOPY; MODELS, STATISTICAL;

EID: 35649015267     PISSN: 10907807     EISSN: 10960856     Source Type: Journal    
DOI: 10.1016/j.jmr.2007.08.015     Document Type: Article

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13. For the case n = ±2 there was some discrepancy in the maximum enhancement obtained here and that presented in reference [5]. Examining the conventional CRAZED maximum signal for the case (n = +2, β = 120°, θ = 0°) and (n = 0, β = 45°, θ = 0°) represented, respectively, by the dotted lines in Fig. 8 and Fig. 6 of reference [5], it was noticed that standard theoretical predictions for the ratio between these maxima was not respected which made a reasonable comparison with the analytical solution difficult. Furthermore, in the analytic results presented here, no signal enhancement was detected for n = ±2 if the second gradient was inserted after the θ pulse.
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