We currently use real-time x-ray on castings. I would suggest you look closely at your requirements, as it can open up a whole can of worms, what you thought were good castings on the outside suddenly under x-ray have levels of shrinkage, which leads to the moral question do you try to fix problem or let sleeping dogs lie.
In addition you will find there is a general vaugness with customers over defect levels, If you give a customer a chart and suggest that level 4 shrinkage sponge would be acceptable, he will think "no, i want level 1 or 2" this would make the part aerospacce quality and therefore command aerospace prices.
Companies to try are
Feinfocus
and
ABB