Hello everyone, I am using the FSL function- FSLMotionOutliers -
https://fsl.fmrib.ox.ac.uk/fsl/fslwiki/FSLMotionOutliers
I am passing the motion corrected file to the function.
motionOutliers = Node(MotionOutliers(no_motion_correction=True, out_metric_plot = 'refrms_plot.png',
out_metric_values='refrms_raw.txt'),name='motionOutliers')
I am getting a peak at the 99th volume (Middle) in all the subjects consistently.
refrms: RMS intensity difference of volume N to the reference volume
Q1. What is the reference volume taken by default?
Q2. Is the peak at 99th volume in all the subjects correct? Why are all the middle volumes most errornous?