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mrtools:analyses [2010/12/01 03:10]
justin
mrtools:analyses [2010/12/01 03:11] (current)
justin
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 The outcome of this step will be an overlay (or multiple overlays, if you want) that can be viewerd in the GUI. The outcome of this step will be an overlay (or multiple overlays, if you want) that can be viewerd in the GUI.
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 ===== Time Series Statistics ===== ===== Time Series Statistics =====
 This computes several maps/​overlays:​ mean over time, median over time, std dev over time, max frame-to-frame difference, max difference between each frame and the median, and the mean divided by the stdev. This computes several maps/​overlays:​ mean over time, median over time, std dev over time, max frame-to-frame difference, max difference between each frame and the median, and the mean divided by the stdev.
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 {{:​mrtools:​timeseriesstats_meanoverstd.png?​600x600|}} {{:​mrtools:​timeseriesstats_meanoverstd.png?​600x600|}}
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   * The mean map (and the mean/std map) of a successfully motion compensated group should line up well with the inplanes. ​   * The mean map (and the mean/std map) of a successfully motion compensated group should line up well with the inplanes. ​
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 {{:​mrtools:​timeseriesstats_better_stdevoverlay.png?​600x600|}} {{:​mrtools:​timeseriesstats_better_stdevoverlay.png?​600x600|}}
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   * If you go to Plots/​Interrogate Overlay, the interrogator in the lower left hand corner will come up with a default plotter. When you select a voxel using the cross-hairs,​ you should see something like this:   * If you go to Plots/​Interrogate Overlay, the interrogator in the lower left hand corner will come up with a default plotter. When you select a voxel using the cross-hairs,​ you should see something like this:
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 {{:​mrtools:​timeseriesstats_interrogator.png?​600x300|}} {{:​mrtools:​timeseriesstats_interrogator.png?​600x300|}}
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   * The max-frame-diff and max-median-diff maps are also useful for checking the motion compensation. Before motion compensation,​ these maps should show large values near the gray/white and gray/CSF boundaries because there are large intensity fluctuations over time due to motion. After motion compensation this "edge effects"​ should be largely eliminated.   * The max-frame-diff and max-median-diff maps are also useful for checking the motion compensation. Before motion compensation,​ these maps should show large values near the gray/white and gray/CSF boundaries because there are large intensity fluctuations over time due to motion. After motion compensation this "edge effects"​ should be largely eliminated.