Which of the following is one of the core PET processes?

• A. Radiopharmaceutical production
• B. Radionuclide production
• C. Data acquisition (PET scanner or tomography)
• D. Ultrasound preparation

Answer: (B)

Radionuclide production is fundamental because PET imaging relies on short‑lived radioactive isotopes that decay by emitting positrons. These isotopes must be created on‑site or nearby (in a cyclotron or generator) and then supplied to form radiotracers. The specific radionuclide’s half‑life, energy, and chemistry determine how the tracer is designed, manufactured, and used in patient studies, and these radiotracers wouldn’t exist without producing the radionuclide first. Data acquisition then uses the produced tracer to capture the PET signal, but it cannot occur without having a radiotracer available. Ultrasound preparation isn’t part of the PET process, since it pertains to a different imaging modality.