Test liquids for quantitative MRI measurements of self-diffusion coefficient in vivo

P. S. Tofts, D. Lloyd, C. A. Clark, G. J. Barker, G. J. M. Parker, P. McConville, C. Baldock, J. M. Pope

Research output: Contribution to journalArticle

170 Citations (Scopus)

Abstract

A range of liquids suitable as quality control test objects for measuring the accuracy of clinical MRI diffusion sequences (both apparent diffusion coefficient and tensor) has been identified and characterized. The self-diffusion coefficients for 15 liquids (3 cyclic alkanes: cyclohexane to cyclooctane, 9 n-alkanes: n-octane to n-hexadecane, and 3 n-alcohols: ethanol to 1-propanol) were measured at 15-30°C using an NMR spectrometer. Values at 22°C range from 0.36 to 2.2 10⁻⁹ m²s⁻¹. Typical 95% confidence limits are ±2%. Temperature coefficients are 1.7-3.2 %/°C. T₁ and T₂ values at 1.5 T and proton density are given. n-tridecane has a diffusion coefficient close to that of normal white matter. The longer n-alkanes may be useful T₂ standards. Measurements from a spin-echo MRI sequence agreed to within 2%.
Original languageEnglish
Pages (from-to)368-374
Number of pages7
JournalMagnetic Resonance in Medicine
Volume43
Issue number3
DOIs
Publication statusPublished - 2000
Externally publishedYes

Keywords

  • Alkane
  • Diffusion coefficient
  • MRI
  • Quality control

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