7.1.291. @ShowDynamicRangeΒΆ

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Usage @ShowDynamicRange <afni dset> The script checks the dynamic range of the time series data at locations inside the brain.

The input dataset is an epi timeseries that has just been assembled from your reconstructed images

The output consists of the following: - A dataset whose prefix ends with minpercchange

wich shows the percent signal change that an increment of 1 digitized value in the time series corresponds to.
  • A dataset whose prefix ends with .range which shows the number of discreet levels used to represent the time series.

The scripts output the average range and the average %change corresponding to a unit digitized signal

To be safe, one should have a dynamic range that does not introduce noise at the level of expected response differences between tasks. For example, if a unit step corresponds to 0.3% signal change then you may not be able to detect differences of comparable magnitude in the FMRI response to two tasks. These differences may be obscured by digitization noise.

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