• **Positron emission tomography**

PET uses radioactive metabolites to visualize metabolic processes. Spatial resolution is limited with PET, so visualization can only be determined in the aorta and larger vessels. The ability to visualize the temporal arteries is limited with PET. The European League Against Rheumatism (EULAR) do not advise PET to screen the cranial vessels, however by using newer PET scanners with improved spatial resolution the temporal arteries may be better visualized in the future [15, 16].
