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 bloodstream. As the radiotracer emits gamma rays, a special camera detects these rays and creates cross-sectional images of the organs or tissues being studied. SPECT is commonly used to evaluate conditions related to the heart, brain, and bones. It helps doctors diagnose diseases, assess the effectiveness of treatments, and plan surgical procedures. The images produced can reveal important information about how well organs are functioning.