Effects of Myocardial Water Exchange on T1 Enhancement during Bolus Administration of MR Contrast Agents

Robert M. Judd, Michael K. Atalay, Gerald A. Rottman, Elias A. Zerhouni

Research output: Contribution to journalArticlepeer-review

Abstract

Interpretation of first‐pass myocardial perfusion studies employing bolus administration of T1 magnetic resonance (MR) contrast agents requires an understanding of the relationship between contrast concentration and image pixel intensity. The potential effects of myocardial water exchange rates among the intravascular, interstitial, and cellular compartments on this relationship are controversial. We directly studied these issues in isolated, nonbeating canine interventricular septa. Myocardial T1 was measured three times/s during bolus transit of intravascular (albumin‐Gd‐DTPA and poly‐lysine‐Gd‐DTPA) and extracellular (gadoteridol) contrast agents. For polylsine‐Gd‐DTPA, the peak changes in myocardial 1/T1 (ΔR1) scaled nonlinearly with perfusate contrast concentration whereas a linear relationship would be expected for fast water exchange among the vascular, interstitial, and cellular compartments. For all agents, the peak ΔR1 were much smaller than the values expected on the basis of fast myocardial water exchange. The data demonstrate that in isolated myocardial tissue, myocardial T1 enhancement during bolus administration of contrast can be strongly affected by myocardial water exchange for both intravascular and extracellular MR contrast agents.

Original languageEnglish (US)
Pages (from-to)215-223
Number of pages9
JournalMagnetic resonance in medicine
Volume33
Issue number2
DOIs
StatePublished - Feb 1995

Keywords

  • contrast agents
  • magnetic resonance
  • myocardial perfusion

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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