Which concept requires keeping exposures as low as reasonably achievable while maintaining diagnostic quality?

• A. ALARA principle
• B. Increased intensity principle
• C. Direct dose principle
• D. Inverse square principle

Answer: (A)

ALARA, which stands for As Low As Reasonably Achievable, is the guiding idea in dental radiology. The aim is to minimize radiation exposure to patients and staff while still obtaining images of sufficient diagnostic quality. Practically, this means choosing appropriate exposure factors, using fast imaging receptors, tightening the beam to the region of interest with proper collimation, ensuring correct beam alignment, employing filtration, shielding, and strict justification to avoid unnecessary repeats. The emphasis is on reducing dose as much as possible without compromising the ability to diagnose. The other concepts don’t capture this protective optimization: increasing exposure would raise dose; there isn’t a standard “direct dose” principle guiding protection; and the inverse square principle describes how dose changes with distance but isn’t the overarching rule about balancing dose with image quality.