When we die, neurotransmitters- dopamine, serotonin, norepinephrine or endorphins are released. That’s why, people who had a near death experience say they saw a ray of light when they were “sleeping”. Or as if euphoria took over, having to see their entire life flash right before their eyes. The color splash seen in the radiation image are the neurotransmitter signals that exploded as the patient succumbed, which could send different sense of emotions. He might thought it was a fleeting experience, it could be panic. But with the burst of extravagant colors such as these, I never knew death could be so beautiful.
(This is an MRI taken from a person who died while he was inside the tube. )