My doc wanted me to have a CT scan when this was diagnosed again for the second time. I decided not to have a CT scan. In the past two years I have had countless CT scans, MRIs and X-rays so I decided I would just do sputum tests every month. My first sputum in November came back positive in two days so I knew it was there. I started the Big 3 in March and my sputum test in July and August have both been negative.My doctor has said I have to finish the protocol for 12 more months. I was so disappointed but I will continue to do the 7% neb solution and the 3 and sputum tests every month. I do understand that the CT scans are safer but I will wait until the winter to do one since I have to finish the 18 month protocol anyway. If this seems not right to you, Sue, please let me know. I have learned so much from this group!