This is probably a stupid question, but does a CT scan show what's causing the rumblings or crackling in the lungs? The doctors could never have figured out my problem with a paralyzed left diaphragm without the various xrays I had, and I should think they would be really important for diagnosis and monitoring purposes for everyone with lung problems. I've been postponing getting a mammogram and going to the dentist because I'm in three high risk groups for COVID and the people doing the procedures are right in your face. I know they are important but not life threatening. I didn't even consider not doing the xrays and tests to get to the bottom of my breathing issues, because they might have been life threatening. I hope you will think about getting the CT scan now if your doctors need the results to evaluate what's really going on with your lungs. A lot can change in a year. The x-ray technicians are masked and can stay several feet away from you; and the hospital where I had them done required masks and made every effort to allocate safe distancing between patients and clean surfaces. Good luck! Nancy