Ureteral stones can be seen by color Doppler ultrasound

Ureteral calculi

are usually caused by kidney stones moving down into the ureter, belonging to a space-occupying lesion, which can squeeze the space of the ureter. Color Doppler ultrasound uses Doppler principle to collect the reflection frequency of ultrasound to make it clear. If the stone size is less than 5mm, it may be difficult to produce effective frequency and generally cannot be seen. However, if the stone size is greater than 5mm, it can usually be seen at this time, which is helpful to judge the position, size and distribution of stones.