Is pet scan different from pep scan?

Yes, a PET scan (Positron Emission Tomography) and a PEP scan (which usually refers to Positron Emission Tomography with a specific tracer, like 18F-FDG) are essentially the same imaging technique, but "PEP" is not a commonly used term. PET scans utilize radioactive tracers to visualize metabolic processes in the body, primarily for cancer diagnosis and monitoring. The distinction may arise from the specific tracers or protocols used, but fundamentally, they both refer to the same imaging modality.