A CT scan of abdomen is equal to 400 X-rays in terms of the radiation exposure to the patient. Spiral CT of Abdomen is equal to 300 X-rays. Don’t rub your eyes in disbelief. It is true! You are not the only one; many experienced doctors whom you trust your life with are also unaware of these facts. A study involving 130 doctors, which was published in British Medical Journal, has shown that most of the doctors are unaware of the radiation hazard that their patients are exposed to when they are subjected to various diagnostic tests.