Which statement is not a component of ALARA principles?

• A. Time
• B. Distance
• C. Shielding
• D. Image processing optimization

Answer: (D)

ALARA stands for As Low As Reasonably Achievable, guiding how to minimize radiation exposure during imaging. The three classic ways to achieve this are reducing the time the patient and staff spend in the beam, increasing distance from the radiation source, and using appropriate shielding to attenuate the beam. Image processing optimization pertains to improving the final image after exposure; it does not directly reduce the dose or control exposure during the acquisition. So while post-processing can help maintain diagnostic quality or allow for lower exposure settings, it isn’t a core method used to apply ALARA principles.