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pubmed-article:6530926pubmed:abstractTextMagnetic resonance imaging demands that tissue contrast and signal-to-noise advantages be sought in each component of the imaging system. One component of magnetic resonance imaging in which contrast and signal-to-noise ratios are easily manipulated is in the choice of pulse sequences and interpulse delay times. This article provides a general method for determining the best choices of interpulse delay times in pulse sequences and applies that method to saturation recovery, inversion recovery, and spin-echo sequences. Saturation recovery and inversion recovery sequences with rephasing pulses, and tissues with unequal hydrogen densities are considered. Optimization of pulse sequences is carried out for the two distinct cases of (a) a fixed number of sequence repetitions and (b) a fixed total imaging time. Analytic expressions are derived or approximate expressions are provided for the interpulse delay times that optimize contrast-to-noise ratios in each pulse sequence. The acceptable range of interpulse delay times to obtain reasonable contrast using each pulse sequence is discussed.lld:pubmed
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pubmed-article:6530926pubmed:issn0730-725Xlld:pubmed
pubmed-article:6530926pubmed:authorpubmed-author:HendeeW RWRlld:pubmed
pubmed-article:6530926pubmed:authorpubmed-author:NelsonT RTRlld:pubmed
pubmed-article:6530926pubmed:authorpubmed-author:HendrickR ERElld:pubmed
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pubmed-article:6530926pubmed:volume2lld:pubmed
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pubmed-article:6530926pubmed:pagination193-204lld:pubmed
pubmed-article:6530926pubmed:dateRevised2007-11-14lld:pubmed
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pubmed-article:6530926pubmed:year1984lld:pubmed
pubmed-article:6530926pubmed:articleTitleOptimizing tissue contrast in magnetic resonance imaging.lld:pubmed
pubmed-article:6530926pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:6530926pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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