Myocardial tagging with SSFP

Daniel A. Herzka, Michael A. Guttman, Elliot R. McVeigh

Research output: Contribution to journalArticle

Abstract

This work presents the first implementation of myocardial tagging with refocused steady-state free precession (SSFP) and magnetization preparation. The combination of myocardial tagging (a noninvasive method for quantitative measurement of regional and global cardiac function) with the high tissue signal-to-noise ratio (SNR) obtained with SSFP is shown to yield improvements in terms of the myocardium-tag contrast-to-noise ratio (CNR) and tag persistence when compared to the current standard fast gradient-echo (FGRE) tagging protocol. Myocardium-tag CNR and tag persistence were studied using numerical simulations as well as phantom and human experiments. Both quantities were found to decrease with increasing imaging flip angle (α) due to an increased tag decay rate and a decrease in myocardial steady-state signal. However, higher α yielded better blood-myocardium contrast, indicating that optimal α is dependent on the application: higher α for better blood-myocardium boundary visualization, and lower α for better tag persistence. SSFP tagging provided the same myocardium-tag CNR as FGRE tagging when acquired at four times the band-width and better tag- and blood-myocardium CNRs than FGRE tagging when acquired at equal or twice the receiver bandwidth (RBW). The increased acquisition efficiency of SSFP allowed decreases in breath-hold duration, or increases in temporal resolution, as compared to FGRE.

Original languageEnglish (US)
Pages (from-to)329-340
Number of pages12
JournalMagnetic resonance in medicine
Volume49
Issue number2
DOIs
StatePublished - Feb 1 2003

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Keywords

  • FGRE
  • FISP
  • Fast cardiac imaging
  • Myocardial tagging
  • SSFP

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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