https://doi.org/10.1351/goldbook.08380
Measured time constant associated with spin-spin relaxation for loss of magnetization in the \(xy\) plane.
Note: \(T_{2}^{*}\) includes losses due to \(\boldsymbol{B_{0}}\) inhomogeneity as well as spin-spin relaxation and is always less than or equal to the spin-lattice relaxation time (\(T_{2}\)).