I have to get a ct scan in an hour. every time i get a ct scan, i feel my body twitching and jolting...

CT (Computed Tomography) scans expose you to many times more gamma particles than a normal x-ray which allows for a very clear and defined image. A normal chest x-ray is equivalent to 10 days worth of normal environmental radiation which is very low. One CT head scan is equivalent to 3 years of normal environmental radiation.