Ref:
http://www.csulb.edu/~hvu/download/c42g57hg64ca02
</rant>
I was pleased to see that my validator reported the appropriate
error for this "CT Image":
Error - Value is zero for value 1 of attribute <Rescale Slope>
I suspect that sometimes this occurs because someone is using one of
those toolkits that helpfully predefines all the required attributes
for an IOD, but with default values of zero that the caller does not
know enough to override.
David