[Insight-users] possible underflow/overflow bug with itkGDCMImageIO

[Walter Blume]

I am writing some code to compute DRRs, starting with the ITK example code in DigitallyReconstructedRadiograph1.cxx and DicomSeriesReadImageWrite2.cxx as examples.

I have some DICOM images that are of type signed short.  They contain the value -32768 for some of the pixel values.   The rescale slope and intercept values in the dicom are 1 and -1024.   When I read these DICOM images the pixel values get scaled and transformed by the equation   buffer = pixel*slope + intercept.  This causes the buffer values to be represented as the positive number 31744 rather than being clipped to -32768, which then causes problems when computing the DRR, since I can't filter out the huge positive values.

Is there a simple way to avoid this problem?
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