|
|
Pre-processing
in resting state fMRI
- The repetition time (TR) is read automatically from
the DICOM header. In those cases where the TR time is not present, a
warning is given, and the time can be specified manually.
- Motion correction can be done. Use Show Results to
display the results of the motion correction (rotation and translation).
- Noise threshold can be specified manually or
automatically.
- Gaussian smoothing can be done in 2D or 3D.
- Temporal smoothing can be done using a bandpass
filter. The bandpass filter using a Butterworth filter can be done,
fitering both high and/or low frequencies.
- It is possible to exclude volumes at start of end of
the time series. If this is set to a value different from zero, they
will be excluded from the analysis.
After
changing any preprocessing step, you can select Redo Preprocessing to check the effect of
the change. If pressing Process
without first pressing Redo
Preprocessing, the changes will be automatically included in the
analysis, meaning that the preprocessing will be redone before the processing
starts. This will only occur if changing of preprocessing parameters has been
done.
See
also:
Seed-based resting state analysis
|
|