There is no clinical data on how large a stone can be detected by MRI; it is possible to detect stones with MRI alone, but it is not accurate enough. There is no accurate indication of how large a stone can be detected by MRI, but it is possible to make a preliminary diagnosis by MRI in cases where stones are suspected. In addition to determining the presence or absence of stones, it can also be used as a preliminary diagnostic modality for oncological diseases, and can promptly rule out the presence of pathological conditions in the urinary system. However, MRI alone cannot accurately determine whether there are stones or not, and should be combined with other tests for diagnostic analysis, including local ultrasound, color ultrasound, enhanced CT, imaging, etc. If stones are suspected, it is recommended to choose the most appropriate examination method for diagnosis and analysis under the guidance of a physician, and once diagnosed, treatment should be carried out in a timely manner.