Abstract
We examined the stress distribution occurring in a two-dimensional sagittal gelatin model using optical stress analysis to make clear the mechanism of the intracranial damage in the shaken baby syndrome (SBS). We modified Holbourn's model and added the lateral ventricle. The device consisted of rotation table, green light source, polarizer, gelatin model and high-speed polarized camera. The model oscillated rotationally in the sagittal direction with 60 degrees of central angle and 2-3Hz of frequency. The average peak values of linear acceleration, angular velocity and acceleration in flexion were 1.7G, 3.5rad/sec and 183.4rad/sec^2, respectively. In color image sequence for major polarization axis direction indicating stress generations, color changes occurred clearly in frontoparietal region near by brain surface just before full flexion. We consider the results may be important for explaining the mechanism of brain injuries in the SBS such as subdural hemorrhage or brain damage.
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