Abstract
Comparison of steady-state free-precession signals just before and after the rf pulse gives a measure of transverse relaxation time T 2. Particularly when a spectral line is inhomogeneously broadened far over the pulse-repetition frequency width ( 1 T ), the effective transverse relaxation time becomes one-half T 2. This method is applicable to spin systems where the longitudinal relaxation time T 2 is at least several times longer than T 2 and therefore suitable for T 2 imaging of biological systems. It possesses the useful property that rf inhomogeneity has no effect on the measured T 2 value as long as T ⪡ T 1.
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