A SPECT scan, or Single Photon Emission Computed Tomography, 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 tracer, which is injected into the bloodstream. The scan detects gamma rays emitted by the tracer, allowing doctors to visualize how organs, such as the heart or brain, are functioning. SPECT scans are commonly used to diagnose conditions like heart disease, epilepsy, and certain types of cancer. The procedure is non-invasive and typically takes about 30 to 60 minutes. Patients may be asked to rest quietly during the scan to ensure accurate results.