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Analyze - Compare
This command performs statistical comparisons between two images. An option
also exists for generating a difference image from the two input images.
The three distance measures reported are:
-  d The normalized root mean squared distance measure.
-  r The normalized mean absolute distance measure.
-  e The worst case distance measure over a 2 x 2 pixel area.
There are also commands for comparison plotting of rows and columns from two images.
This is quite helpful when comparing a phantom to a reconstruction. As with plotting
of rows and columns, click the left mouse button over the desired cursor point to
choose which row and column to plot.