PET/CT during lung infection

I'm a former colon cancer patient, and my oncologist is monitoring nodules and ground glass granulomas in my lungs. Unfortunately, I've had chronic bronchitis for nine months, which has made it challenging for the radiologist to distinguish between infection and cancer.

I have a 6-month PET/CT scan scheduled for this Friday, and I'm concerned it will have limited value due to my infection. The alternative is to wait and hope my lungs improve, but the soonest opportunity is 3 months from now because I'll be out of the country. Also, there's the risk that my bronchitis is my "new normal" and will never entirely resolve.

Any advice or guidance on whether to have the scan or postpone?

Thanks.