Positron Emission Tomography (PET) Scanners segmentation by application reveals four principal demand drivers: Oncology, Cardiology, Neurology, and Research. Oncology remains the dominant segment, accounting for roughly 55 % of total market revenue, driven by the established role of PET in tumor staging, treatment monitoring, and personalized therapy selection. Cardiology, representing about 20 % of the market, leverages PET’s capability to quantify myocardial perfusion and viability, supporting risk stratification in coronary artery disease. Neurology contributes approximately 15 % as PET enables precise mapping of cerebral metabolism for disorders such as Alzheimer’s disease, epilepsy, and movement disorders, influencing both diagnostic pathways and drug development. The residual 10 % is captured by Research institutions that acquire PET systems for pre‑clinical and translational studies, often opting for high‑resolution or hybrid configurations to explore novel radiotracers. Collectively, these application categories shape the overall PET Scanners market size by dictating unit sales, service contracts, and ancillary consumables, making application‑driven demand the primary taxonomy for market forecasting.