Whether you need to do CT for kidney stones depends on your condition and treatment: 1. If it is an ordinary kidney stone for review or screening, you do not need to do CT, you only need to do kidney ultrasound, which can also understand or dynamically observe the changes in the size of kidney stones and the changes in their hydronephrosis. 2. It helps to select parameters such as lithotripsy channel, lithotripsy method, lithotripsy position, and also to understand the CT value of the stone, that is, to determine the hardness of the stone.3. If it is a post-surgical review, it is also recommended to do a renal CT, which can effectively compare with the renal CT before surgery, and dynamically observe the changes in the stone location and whether its stone is cleared, whether the ureteral stent tube is well positioned, and other parameters, but if it is physical examination in nature does not require a first choice of CT, a first choice of ultrasound is sufficient.