Magnetic resonance long T1 and long T2 signals are T1 low signal, black, and T2 high signal, white. The general T1 and T2 distinction is based on the different durations used in the magnetic field, with T1-weighted images for longitudinal relaxation time and T2-weighted images for transverse relaxation time, which creates a black and white signal contrast in MRI, mainly from the differences in MRI signals produced by different tissues in the patient’s body. Generally long T1 and long T2 signals are commonly found in cerebral infarcts, inflammation, tumors and fluid such as omental cysts, and generally short T1 signals are white and commonly found in adipose tissue.