What is a problem related to CT scans which is suitable for investigation. what i mean is in scientific term such as the effect of the temperature or the effect of the contrast agent?

This problem isn't related to the computer tomograph (CT) scan itself, but to the ordering of a scan. It's this one. The machine is really expensive. It costs a bomb. And lots of pressure is put on physicians to pay it off by using it. Most of the scans are paid for by health insurance companies and the government. How many extra scans are ordered when they aren't really necessary so a clinic can get the unit paid off and then really start to make some money?