Behind helmet blunt trauma (BHBT) studied with X-ray cinematography
Brain injuries can occur even with a bullet-proof helmet
A study of 6,000 cases reveals that, even if 70% of injured patients were wearing bullet-proof helmets and other individual protective equipment, 50% was found to have suffered brain injuries.
When a helmet is deformed, the shock waves can be transmitted to the brain which can cause serious damage and lead to brain injuries. A study of 6000 cases concluded that, even if 70% of injured patients were wearing bullet-proof helmets and other individual protective equipment, 50% was found to have suffered brain injuries (Rafaels, Journal of Forensic Sciences, 60(1)(2015)219).
770 m/s impact
The image below shows a helmet having been hit by a bullet traveling at 770 m/s. Dynamic event images captured by high-speed flash X-ray cinematography can give details of the impact process which is valuable information toward understanding BHBT.
Flash X-ray cinematography
The series of X-ray images below shows the helmet during impact. The images are recorded with a 20 microsecond time interval between each image.
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