Nuclear Cardiology segmentation by application divides the market into Diagnostic, Therapeutic and Research uses. The Diagnostic application—encompassing myocardial perfusion imaging, viability assessment, and gated blood‑pool studies—remains the dominant driver, accounting for roughly 55 % of total revenue because hospitals and imaging centers rely on these procedures for coronary artery disease detection and risk stratification. The Therapeutic application, which includes radioisotope‑based treatments such as ^131I‑MIBG therapy and emerging targeted alpha‑particle agents, contributes about 30 % of the market; its growth is linked to expanding indications for heart failure management and the adoption of personalized radionuclide therapy protocols. The Research segment, covering clinical trial imaging, drug development support, and academic investigations, represents the remaining 15 % and is critical for pipeline innovation, although its monetary share is modest relative to the clinical segments. Together, these application categories shape the overall Nuclear Cardiology market size by defining demand patterns, reimbursement structures, and capital investment priorities globally.