Friend's unpleasant experience uring CT scan deleted

I'd suggest writing a detailed letter about the incident to the
hospital administrator. Specify the date and time. If possible the
names of the technicians. 

Send a copy to the clinician under whose care your friend was
admitted. I say this because, though your friend has no argument
with the doctor, I have found that administrators sometimes ignore
complaints until the patient becomes litigious. Clinicians may not
have been informed of the complaint and are very surprised to find
themselves named in a suit.

If there is no response within a week send a follow up letter.
Attach a photocopy of the original letter. Do this weekly until you
do get a response.

CAT scans are non-invasive but they can be very scary. The scanner
can be a bad place for the claustrophobic. There was an interesting
study in the BMJ, about 10 years ago, which found that around 10% of
people who had CAT scans found it so unpleasant that they would
never have another. This compares with 15% who said the same about a
lumbar puncture. 