Vickie, just about everything I know about this is posted above by me and Ed. If your father has not had and does not need any traumatic dental work such as extractions, it may be that the radiologist thinks the HBO will heal his throat. You are correct that the treatments are expensive, however mine were completely covered by insurance so I cannot quote you a price. If you search this site, both the forum and main site, you can find more HBO information. The treatments can cause a slight discomfort in the ears initially, but that goes away and I found the treatment to be a good time to nap or watch movies. I hope everything works out well for your father and you too!