Abstract #0652

Analysis of Physiological Brain Shift and Optic Chiasm in the Closed Cranium due to Postural Position

Etsuko Kumamoto¹, Shigeto Hayashi^1,2, Ari Shinojima³, Koshi Yokota⁴, and Eiji Kohmura⁵

¹Kobe University, Kobe, Japan, ²Department of Neurosurgery, Hyogo Emergency Medical Center, Kobe, Japan, ³Keio University, Tokyo, Japan, ⁴Japan Aerospace Exploration Agency, Tsukuba, Japan, ⁵school of medicine, Kobe University, Kobe, Japan

Methodological analysis related to physiological brain shift in the closed cranium is lacking. The spaceflight-associated neuro-ocular syndrome is attributed to the upward shift of the brain. We analyzed the relationship of brain shift and optic nerve shift by using MR volume data acquired in different body positions. The movement and rotation of each voxel, divided into 20 × 20 × 20 pixels³, were calculated using the block matching method. Experimental results show that the optic nerve transforms and deforms with the movement of the brain because of a change in body position.

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