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Other tests used to stage lung cancer at diagnosis include: 1  Magnetic Resonance Imaging (MRI). A type of imaging scan that uses magnetic fields to create clear images of body parts, including tissues, muscles, nerves and bones. 2  Positron Emission Tomography (PET). A type of imaging scan that is used to tell if lung cancer has spread to other parts of the body. Cells use sugar (glucose) for energy to function and cancer usually uses more than other cells or tissues. A special sugar solution is injected into the body through a vein.
CT and MRI scans are anatomic imaging modalities, which means that they look at the size and shape of organs and body structures. A PET scan is a metabolic imaging modality, which means it looks at cellular activity. The information collected from a PET scan is different from any other test that is available.