Quantitation of T2* with spiral imaging sequences can be made in two distinct ways: Collecting data at various echo-times results in a measurement of the chemical shift after Fourier transformation along the echo-time dimension. Off resonance is intrinsically corrected by this processing. Alternately, multiple-echo spiral imaging can be used to quantitatively measure T2* as long as dephasing from B0 distortion is small over the duration of the spiral readout. Multiple spiral interleaves are used to reduce the readout time of the spiral. Both methods are demonstrated.
