TR in rest state fMRI

Submitted by abujamea on Wed, 09/10/2014 - 15:55

 Dear colleagues I am beginner in rest state fMRI experiments, my question might look silly for you, I saw many rest fMRI protocols they mentioned that TR should not exceed 3000ms, is it technical issue or it has some relation to mechanism of the brain networking and MR signal, and what they mean by Default mode network shows up in resting fMRI as areas with temporally correlated baseline activity, 0.01 Hz < frequency < 0.08 Hz.
Thank you for your contribution. 

Submitted by Wei Liao on Mon, 10/20/2014 - 22:42

1. The TR is not only technical issue, but also affect the network stability or/and functional connectivity stability. [ref: White, T., Muetzel, R., Schmidt, M., Langeslag, S.J., Jaddoe, V., Hofman, A., Calhoun, V.D., Verhulst, F.C., Tiemeier, H., 2014. Time of acquisition and network stability in pediatric resting-state functional magnetic resonance imaging. Brain Connect 4, 417-427.].
2. For this issue, you can learn more from the original DMN works.

Hoping it is helpful.