Most Hospitals and physicians will not prescribe a pet/ct because of the cost and your insurance not paying for the procedure. There is also a strict fasting preparation,proper tracer and high end Imaging needed.

I had a large "golf ball size tumor " on my left lung that was not seen with a conventional Xray ,
CT with contrast or MRI contrast.

The CT scan with contrast displayed a 3mm x 6mm small lesion. Because of my Sarcoidosis history , the pulmonary physician prescribed a pet/ct scan at a nearby imaging center that just installed the newest and best CT scanner in the area.
I had to wait 2 weeks for an appointment. The diagnosis was a large orange image tumor on my left upper lobe. The radiologists told me I had a 95% chance of lung cancer and needed an immediate biopsy . They could not perform a biopsy for 4 weeks.

Worrying that I had lung cancer I called the Moffitt Cancer Center in Tampa Fl. I had a major lung wedge resection operation in one week. In the recovery room the Pulmonary Surgeon told me I had sarcoidosis not cancer on my right lung and a large fungal ball on the left side that he carefully removed.
The fungus was Aspergillus and anti fungal therapy was the first treatment needed. Pfizer Pharmaceutical at Moffitt Cancer Center provided at no cost Vfend their name brand anti fungal tablets.

Next step was to find a Sarcoidosis Center of Excellence and I chose Mayo Clinic Jacksonville. I currently have a team of Sarcoidosis specialist. They performed a full body pet/ct scan finding Cardiac Sarcoidosis ,Pulmonary Sarcoid , upper GI stomach Sarcoid . They also diagnosed a Right Bundle Branch Block and irregular heart beat. Installed a loop recorder. Main sympton is still syncopy. My Treatment is ongoing at Mayo. We have made the long ride 4 times this year.