Dose in radiology refers to which of the following?

• A. The amount of energy absorbed by tissues
• B. The rate of image capture
• C. The voltage of the x-ray tube
• D. The speed of the processor

Answer: (A)

Dose in radiology is the amount of energy from the radiation that is deposited in the body's tissues. This energy transfer, measured as absorbed dose (gray), reflects how much energy actually interacts with and is absorbed by tissues, which is what can cause biological effects. The rate at which images are captured is a different idea (dose rate or exposure rate), the X-ray tube voltage affects photon energy but not the total energy absorbed by tissue by itself, and processor speed has no relation to radiation exposure. Understanding dose helps balance getting clear diagnostic images with keeping patient exposure as low as reasonably achievable.