Study on Brain Injury Mechanism during rotational impact by using a Real-Shaped Physical Model of a Human Head

本研究的目的是利用CAD/CAM技术构建具有真实人体形状的头部物理模型，并测量旋转冲击下剪切应变在脑模型中的分布和传播。根据受试者的CT和MR图像构建了3D头部物理模型。该模型由颅骨、镰刀、脑脊液和脑组成。用数字图像相关法(DIC)测量脑冠状面的全场形变行为。结果显示，胼胝体、脑室周围和大脑纵裂处的剪切应变最大。结果符合弥漫性轴索损伤的发生特点。因此，脑的复杂形状和颅脑之间的相对运动影响着创伤性脑损伤的发生机制。

The purposes of this study were to construct a head physical model having a real human shape by using CAD/CAM technologies, and measure shear strain distribution and propagation in the brain model under rotational impact. A 3D head physical model was constructed from CT and MR images of a subject. The model consists of a skull, falx, cerebrospinal fluid (CSF) and brain. Full-field deformation behavior on the coronal plane of the brain was measured by using digital image correlation (DIC). As the results, shear strain at corpus callosum, surrounded ventricles and longitudinal fissure of cerebrum, showed biggest value. The results correspond to the characteristics of occurrence of diffused axonal injury. Therefore, complex shape of brain and the relative motion between the skull and brain affect on the mechanism of traumatic brain injury.