The patient wears a hospital gown during the procedure. Usually fasting is not necessary prior to the procedure. Well, that can be an entirely different story. Lying Still The ability to lie unmoving for the duration of the scan depends both on the age, personality, and state of illness of the child. Plus, the CT scan emits X-rays, so you, the parent, can't just stand there unprotected and hold your child's hand.
Parents often can wear a lead apron and stay next to their child.
Here are some parents' recounts. They used a sedative for her that's in the phenobarb family - I forget the name. The first CT EJ had was on the day he was diagnosed. Anyway, they were so very close to doing it, but then EJ panicked, so they sedated him. He's been sedated for every MRI and CT since then.