The longitudinal and transverse relaxation time constants of blood vary across
subjects, developmental stages, physiological states or specific diseases. We
implemented a fast method for simultaneous in
vivo measurements of blood T1 and T2. Although such
an approach has been successfully demonstrated, its repeatability or robustness
has not been assessed. We performed a two-session study using our fast in vivo blood T1 and T2
imaging method, and the study results are reported in the following.