Single Photon Emission Computed Tomography (SPECT) is a medical imaging technique that provides detailed pictures of blood flow and activity in the body. It uses a small amount of radioactive material, called a radiotracer, which is injected into the patient. As the radiotracer emits gamma rays, a special camera detects these rays and creates images that show how organs and tissues are functioning. SPECT is commonly used to evaluate conditions such as heart disease, cancer, and brain disorders. The images produced help doctors diagnose diseases, assess treatment effectiveness, and plan further medical interventions. This non-invasive procedure is valuable for understanding various health issues.