Christian H. Kasess1,2, Ewald Moser1,2,
Christian Windischberger1,2
1MR Center of Excellence, Medical
University Vienna, Vienna, Austria; 2Center for Biomedical
Engineering and Physics, Medical University Vienna, Vienna, Austria
Most
studies applying DCM have thus far used relatively long repetition times.
However, higher sampling rates should provide for a better comparison of
different model structures due to better sampling of the hemodynamic response
and an increased number of samples. Here we tested the influence of the
repetition time on model selection at different noise levels based on
simulated data. Results show improved model selection on a group level at
short repetition times, in particular at lower signal-to-noise ratios
illustrating the benefits of using short repetition times.