Publication Type | Academic Article |
Authors | Reynaud O, Winters K, Hoang D, Wadghiri Y, Novikov D, Kim S |
Journal | Magn Reson Med |
Volume | 76 |
Issue | 1 |
Pagination | 237-47 |
Date Published | 07/24/2015 |
ISSN | 1522-2594 |
Keywords | Brain Neoplasms, Diffusion Magnetic Resonance Imaging, Glioma, Image Interpretation, Computer-Assisted, Oscillometry |
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. |
DOI | 10.1002/mrm.25865 |
PubMed ID | 26207354 |
PubMed Central ID | PMC4724565 |