I'm talking about the x-ray, nothing more and nothing less. If they have a broken foot and need a cast, the cast should be an estimatable line item based on where it's broken, age/gender/size of the patient, and materials used. If a doctor has put a cast on 1,000 broken feet on men aged 12-16, they should have a very good idea of the material and time it will take and the number of nurses or whatever else they need to put it on.