Cell membrane water exchange effects in prostate DCE-MRI

Xin Li, Ryan A. Priest, William J. Woodward, Faisal Siddiqui, Tomasz M. Beer, Mark G. Garzotto, William D. Rooney, Charles S. Springer

Research output: Contribution to journalArticle

19 Scopus citations

Abstract

Prostate Dynamic-Contrast-Enhanced (DCE) MRI often exhibits fast and extensive global contrast reagent (CR) extravasation - measured by K trans, a pharmacokinetic parameter proportional to its rate. This implies that the CR concentration [CR] is high in the extracellular, extravascular space (EES) during a large portion of the DCE-MRI study. Since CR is detected indirectly, through water proton signal change, the effects of equilibrium transcytolemmal water exchange may be significant in the data and thus should be admitted in DCE-MRI pharmacokinetic modeling. The implications for parameter values were investigated through simulations, and analyses of actual prostate data, with different models. Model parameter correlation and precision were also explored. A near-optimal version of the exchange-sensitized model was found. Our results indicate that ΔKtrans (the K trans difference returned by this version and a model assuming exchange to be effectively infinitely fast) may be a very useful biomarker for discriminating malignant from benign prostate tissue. Using an exchange-sensitized model, we find that the mean intracellular water lifetime (τi) - an exchange measure - can be meaningfully mapped for the prostate. Our results show prostate glandular zone differences in τi values.

Original languageEnglish (US)
Pages (from-to)77-85
Number of pages9
JournalJournal of Magnetic Resonance
Volume218
DOIs
StatePublished - May 2012

Keywords

  • Contrast reagent
  • Dynamic-Contrast-Enhanced
  • Prostate cancer
  • Water exchange

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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