Surface-to-volume ratio mapping of tumor microstructure using oscillating gradient diffusion weighted imaging. Academic Article uri icon

Overview

abstract

  • PURPOSE: To disentangle the free diffusivity (D0 ) and cellular membrane restrictions, by means of their surface-to-volume ratio (S/V), using the frequency-dependence of the diffusion coefficient D(ω), measured in brain tumors in the short diffusion-time regime using oscillating gradients (OGSE). METHODS: In vivo and ex vivo OGSE experiments were performed on mice bearing the GL261 murine glioma model (n = 10) to identify the relevant time/frequency (t/ω) domain where D(ω) linearly decreases with ω(-1/2) . Parametric maps (S/V, D0 ) are compared with conventional DWI metrics. The impact of frequency range and temperature (20°C versus 37°C) on S/V and D0 is investigated ex vivo. RESULTS: The validity of the short diffusion-time regime is demonstrated in vivo and ex vivo. Ex vivo measurements confirm that the purely geometric restrictions embodied in S/V are independent from temperature and frequency range, while the temperature dependence of the free diffusivity D0 is similar to that of pure water. CONCLUSION: Our results suggest that D(ω) in the short diffusion-time regime can be used to uncouple the purely geometric restriction effect, such as S/V, from the intrinsic medium diffusivity properties, and provides a nonempirical and objective way to interpret frequency/time-dependent diffusion changes in tumors in terms of objective biophysical tissue parameters. Magn Reson Med 76:237-247, 2016. © 2015 Wiley Periodicals, Inc.

publication date

  • July 24, 2015

Research

keywords

  • Brain Neoplasms
  • Diffusion Magnetic Resonance Imaging
  • Glioma
  • Image Interpretation, Computer-Assisted
  • Oscillometry

Identity

PubMed Central ID

  • PMC4724565

Scopus Document Identifier

  • 84974794881

Digital Object Identifier (DOI)

  • 10.1002/mrm.25865

PubMed ID

  • 26207354

Additional Document Info

volume

  • 76

issue

  • 1