T1 and T2 in nuclear magnetic resonance refer to special values, which are related to the atomic nuclear spins. Where T1 is the longitudinal duration and T2 is the transverse duration. In the human body, the values of T1 and T2 are different in diseased and normal tissues, so that MRI can be used to diagnose diseases. In the MRI report, it is more often seen as long T1 and long T2. where long T1 means that it shows a low signal on the MRI signal and long T2 shows a bright signal on the MRI signal, which is the manifestation form of most diseases. The different T1 and T2 values of the lesion are mainly used for the purpose of diagnosing the disease.