What imaging surveillance do you do after SABR of oligo lung metastases?

Since these are metastatic patients I would recommend chest CT scans every 3-4 months for the first and second years. Abdomen and pelvis CT scans could also be done depending on the patient and their disease. I do not recommend PET-CT after SBRT for lung metastases or after SBRT for lung primaries. These lesions can be followed with CTs alone. PET-CT to evaluate the irradiated lesion(s) should only be used if there is concern for recurrence. If your radiologists or medical oncologists are not ex...

My local Radoncs like to get baseline pet/ct then repeat pet/ct after about 2-3mos after sabr, since, not infrequently, irradiate lung met may look larger after sabr from radiation changes. Decrease in SUV value would be reassuring. I then usually follow q3mos for 1st year with less frequently thereafter.