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Detection of apparent restricted diffusion in healthy rat brain at short diffusion times
Author(s) -
Niendorf Thoralf,
Norris David G.,
Leibfritz Dieter
Publication year - 1994
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.1910320520
Subject(s) - diffusion , nuclear magnetic resonance , diffusion mri , neuroscience , medicine , physics , biology , magnetic resonance imaging , radiology , thermodynamics
The application of bipolar diffusion sensitizing gradient pulses to significantly reduce the diffusion time is described. This approach is combined with the rapid U‐FLARE imaging sequence. Three diffusion‐sensitized types of experiments are compared and their suitability for detecting restricted diffusion is discussed. Experiments using a modification of the diffusion weighting by varying the diffusion time between 1.6 and 6.0 ms obtained nonmonoexponential signal attenuation curves from both healthy brains and postmortem. This behavior is indicative of restricted diffusion, but as it is detectable only at short diffusion times, in contrast to a restriction due to impermeable barriers, we have termed this “apparent restriction”.