Both use radiation/XRays. Scuba is right as rain about CT scan. Can’t you ask your doc for a MRI instead ?
I have a small list of thoughts which keep haunting me every single day and one of them is … why on earth did I not do more to avoid CT Scans ?
Somethings are hard to avoid like fluoroscopy (which may be worse than CT Scan) .. some procedures like spinal nerve blocks have to be performed using that ..