You do not need rescale slope or intercept to display images. You only those if you are doing analysis that depend on absolute units, like if your code needs filter based on 17 to 31 Hounsfeld units.
https://blog.kitware.com/dicom-rescale-intercept-rescale-slope-and-itk/
No, what you need is imagesc(), possibly with a range values to pick out in the second parameter.
