Double-DANTE tagging sequence for the evaluation of heart wall motion

Timothy J. Mosher, Michael B. Smith

Research output: Contribution to conferencePaperpeer-review

Abstract

A magnetic resonance imaging sequence that generates a high-density grid pattern of tags is discussed. This sequence is similar to the spatial modulation of magnetization (SPAMM) technique described by L. Axel and L. Dougherty (1989), which utilizes binomial RF pulses interspersed with pulsed gradients. In the sequence described, the tag placement occurs by exciting the sample with a DANTE pulse sequence in the presence of a continuous frequency encoding gradient. This results in a set of thin parallel lines whose separation can be controlled by varying either the Dante delay or the gradient strength. The tagging sequence requires less than 10 ms to define a cross-sectional grid. By alternating the phase of the DANTE pulses between 0° and 180°, excitation occurs at four different frequencies, thereby quadrupling the number of tags. The use of a DANTE pulse train provides better frequency selectivity and reduces the bandwidth limitation of the longer binomial pulses. This results in thinner, more uniform tag placement in less time.

Original languageEnglish (US)
Number of pages1
StatePublished - Jan 1 1990
EventProceedings of the Sixteenth Annual Northeast Bioengineering Conference - University Park, PA, USA
Duration: Mar 26 1990Mar 27 1990

Other

OtherProceedings of the Sixteenth Annual Northeast Bioengineering Conference
CityUniversity Park, PA, USA
Period3/26/903/27/90

All Science Journal Classification (ASJC) codes

  • Bioengineering

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