DICOM2DoseMatrix issue.

[mbower10]

I think the DICOM2DoseMatrix code has an issue reading in Unsigned Int Pixel data when the highest bit is set. I have an RTDose with Bits allocated and Stored = 16, High Bit = 15, and Pixel Representation = 0 (unsigned int). If I scale my Pixel data so that 32000 is the max, the data is read in correctly. If I scale the pixel data so that 65000 is the max value, then the maximum dose is about half what I expect, and the minimum dose is close to -Max Dose. I think it's reading those values in as signed short ints because the highest bit is set. I think any value > 32,768 in the Pixel data is going to cause this problem.