The cordotomy procedure will take place in the CT scan area. Before the procedure, a radiologist will perform a spinal tap to inject a contrast drug into the spinal fluid. This will allow researchers to see the spinal cord well on the CT scan. You will be taken to the diagnostic CT scanner and given local anesthetic and standard drugs by vein to help you feel comfortable. A needle will be inserted using CT scan guidance into the side of the neck opposite to your pain. A radiofrequency electrode will pass through the needle into your spinal cord, and your nerve reactions to movement and sensation will be checked. If these reactions are not satisfactory, the needle will be adjusted or the procedure will be stopped.