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Time‐Dependent Influence of Cell Membrane Permeability on MR Diffusion Measurements
Author(s) -
Li Hua,
Jiang Xiaoyu,
Xie Jingping,
McIntyre J. Oliver,
Gore John C.,
Xu Junzhong
Publication year - 2016
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.25724
Subject(s) - membrane , permeability (electromagnetism) , diffusion , chemistry , nuclear magnetic resonance , membrane permeability , effective diffusion coefficient , analytical chemistry (journal) , materials science , biophysics , chromatography , magnetic resonance imaging , physics , thermodynamics , biochemistry , medicine , radiology , biology
Purpose To investigate the influence of cell membrane permeability on diffusion measurements over a broad range of diffusion times. Methods Human myelogenous leukemia K562 cells were cultured and treated with saponin to selectively alter cell membrane permeability, resulting in a broad physiologically relevant range of 0.011–0.044 μm/ms. Apparent diffusion coefficient (ADC) values were acquired with the effective diffusion time (Δ eff ) ranging from 0.42 to 3000 ms. Cosine‐modulated oscillating gradient spin echo (OGSE) measurements were performed to achieve short Δ eff from 0.42 to 5 ms, while stimulated echo acquisitions were used to achieve long Δ eff from 11 to 2999 ms. Computer simulations were also performed to support the experimental results. Results Both computer simulations and experiments in vitro showed that the influence of membrane permeability on diffusion MR measurements is highly dependent on the choice of diffusion time, and it is negligible only when the diffusion time is at least one order of magnitude smaller than the intracellular exchange lifetime. Conclusion The influence of cell membrane permeability on the measured ADCs is negligible in OGSE measurements at moderately high frequencies. By contrast, cell membrane permeability has a significant influence on ADC and quantitative diffusion measurements at low frequencies such as those sampled using conventional pulsed gradient methods. Magn Reson Med 75:1927–1934, 2016. © 2015 Wiley Periodicals, Inc.