Keywords: Traumatic brain injury, Traumatic brain injury, Motion encoding gradient, transient motionTo study how the human brain moves and deforms under a sub-injury level transient impact, we tested the feasibility of measuring in-vivo brain transient motion resulting from a small amplitude impact using the multi-scale MR Elastography technique. Transient motion was encoded by wavelet-based motion encoding gradients at two wavelet scales plus a scaling function, and displacement was calculated using the inverse Haar transform. Brain motion over a wide frequency range was detected and was found to be consistent with previous results from a much higher impact.
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