CT scans are used to initially detect lung cancer and can also be used for detecting liver metastasis.
MRIs are not used for the chest to follow lung cancer because it doesn’t show up too well, but it may be used when following a liver metastasis. MRIs are typically longer, about 30-60 minutes and can involve a contrast dye injection.
PET imaging is great for detecting liver metastasis. PET imaging uses a sugar-dye injection that is easily detected in the liver and can last 30-60 minutes. Your doctor may ask you to go on a low carbohydrate diet and avoid strenuous exercise going into a PET scan.
Your care team might recommend multiple tests to find where the cancer may have metastasized to and to follow the cancer as you receive treatment to help determine treatment adjustments. Coverage for these diagnostic tests may vary based on several factors, depending on the insurance. It’s always good to check to see what you are covered for in advance.