I agree with caregiver222. The scan won't tell your doctor more than he already knows.
Thanks for your comment and advice.
A CT scan is inappropriate.
The scan involves a high level of radiation and does not provide good enough information.
If you decide on a scan, a 3T MRI would be far better with less risk.
Whether or not you need one is a judgment call.
Basically, he is guarding against a malpractice tort, in the remote possibility there is something structurally wrong that he missed.