I have a Radio on C4-C6. My docs said that is as far down the spine they will do Radio. So we have been trying to reach between C7 and C8 on my right side where the pain is. So he goes down my spine to that point and makes an injection but does not burn the nerve end. This may last several months and the pain may not even come back. So SNI is finding one certain nerve and giving an injection not Radio. I hope maybe I have cleared up some of your questions. KLH