Clinical Molecular Imaging System segmentation by application centres on the clinical questions each study answers. Oncology dominates, accounting for roughly 52 % of 2023 global demand, because PET/CT and PET/MRI are now embedded in staging, therapy response assessment, and recurrence surveillance guidelines for lung, lymphoma, prostate, and breast malignancies. The value is quantified through faster treatment decisions and reduced futile surgeries, translating into average per-scan reimbursements of USD 1,050–1,400 in the U.S. Neurology represents 24 % of the installed base; amyloid and tau PET have created incremental volume in Alzheimer’s evaluation, offsetting flat dementia work-ups. Cardiology contributes 14 %, driven by myocardial viability and sarcoidosis protocols where sensitivity > 90 % alters revascularisation planning. Finally, infection & inflammatory disorders and thyroid & parathyroid indications constitute the residual 10 %, but are growing 7–8 % CAGR as FDG-PET is adopted for fever of unknown origin and prosthetic joint infections, expanding the addressable market beyond traditional oncologic imaging.