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Applied Bionics and Biomechanics
Volume 2015 (2015), Article ID 837585, 8 pages
http://dx.doi.org/10.1155/2015/837585
Research Article

A QCT-Based Nonsegmentation Finite Element Head Model for Studying Traumatic Brain Injury

Department of Mechanical Engineering, University of Manitoba, Winnipeg, MB, Canada R3T 5V6

Received 30 September 2014; Revised 17 January 2015; Accepted 17 January 2015

Academic Editor: Laurence Cheze

Copyright © 2015 Zhaoyang Liang and Yunhua Luo. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In the existing finite element head models (FEHMs) that are constructed from medical images, head tissues are usually segmented into a number of components according to the interior anatomical structure of the head. Each component is represented by a homogenous material model. There are a number of disadvantages in the segmentation-based finite element head models. Therefore, we developed a nonsegmentation finite element head model with pointwise-heterogeneous material properties and corroborated it by available experiment data. From the obtained results, it was found that although intracranial pressures predicted by the existing (piecewise-homogeneous) and the proposed (pointwise-heterogeneous) FEHM are very similar to each other, strain/stress levels in the head tissues are very different. The maximum peak strains/stresses predicted by the proposed FEHM are much higher than those by the existing FEHM, indicating that piecewise-homogeneous FEHM may have underestimated the stress/strain level induced by impact and thus may be inaccurate in predicting traumatic brain injuries.