Enhanced CT does not necessarily reveal stones, and whether it is enhanced or not does not have much impact on the determination of stones, both plain CT and enhanced CT may miss negative stones. The purpose of doing enhanced CT is to identify the nature of the lesion through intravenous injection of contrast material, using the different structure of the lesion and normal tissue, the different ability to uptake contrast material, presenting a different imaging performance, so there is no great significance to the stones. To look at a site of stones, you can do ultrasound, for special stones can also do X-ray, sometimes also need to be complementary examination of the two to be able to determine. Enhanced CT is not usually done to look at stones, it is usually used for tumors and such.