T1 in pancreatic MRI represents the longitudinal relaxation time and T2 the transverse relaxation time, which together can indicate the difference in matter in MRI. After switching off the RF pulse, the proton is energized by the main electric field and shifts from a high-energy to a low-energy state, while the vertical magnetization vector gradually increases until it reaches the equilibrium state prior to excitation, a process known as “longitudinal relaxation”. The time required to go from 0 to 63% of the longitudinal magnetization is called the longitudinal relaxation, or T1. After the RF pulse is turned off, the protons are no longer synchronized in the same phase and are dispersed in the same direction, causing the maximum decay of the transverse magnetization vector to 0. This is a process called “lateral relaxation”, or transverse relaxation, or T2. The difference between the T1 and T2 signals can be used to determine the composition of a substance.