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Abstract #1132

In-vivo water gap mapping as a new myelin packing marker

Rona Shaharabani1 and Aviv Mezer1
1Edmond & Lily Safra Center for Brain Science, The Hebrew University, Jerusalem, Israel

Synopsis

Keywords: White Matter, Multiple Sclerosis, Myelin water imaging, water content

We established a new in-vivo measurement of the myelin water gap that can serve as a biomarker for myelination packing. In postmortem studies, it was shown that the water layer gap between healthy myelin membranes is compact. However, it changes during the demyelination and remyelination processes in MS patients. We developed a biophysical model based on the water fraction and multi-compartment T2 to estimate the water gap. Next, we designed a lipid phantom system with varying water gaps and validated it using Cryo-TEM. Our model successfully estimates the water gap in-vitro and shows a reliable estimation for in-vivo healthy volunteers.

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Keywords