Magnetic resonance water imaging is a technique taken to image water using the principle of its long T2 property. The slow-moving water and free water inside the tissue have very heavy and long T2 characteristics. The long T2 weighted sequence is used to apply RF pulses to the examination site, and the signal of tissues other than water is attenuated, and after the signal is attenuated, the signal is not much developed, while water is not affected by the attenuation due to the long T2 characteristic, and has a high long T2 signal, and after the image processing, only the water is shown. In clinical practice, water imaging of the urinary tract, i.e. MRU, and water imaging of the pancreatic and biliary ducts, called MRCP, are more frequently used, and better water imaging can replace the usual imaging.