For imaging very small patients, which device is often not suitable due to their small size when using standard radiography equipment?

• A. Phototimers
• B. Filtration
• C. Gonadal shielding
• D. Collimation

Answer: (A)

Phototimers (AEC) regulate exposure by measuring the radiation reaching a detector under the patient and stopping the exposure when a preset signal is reached. For very small patients, the anatomy may not adequately cover the detector or provide a representative signal, so the system can terminate the exposure at an inappropriate point. This makes the resulting image density and dose less reliable compared to manual techniques. Because of this potential for inconsistent or suboptimal exposure in tiny patients, manual exposure control is often preferred when imaging very small individuals on standard radiography equipment.