The annual dose limit is the maximum dose that may be received in a calendar year.

(ALI) The annual limit on intake refers to the body intake of radionuclides by inhalation, ingestion or through the skin in one year, which would result in a committed dose equal to the relevant dose limit.

The anode is the positive terminal of an x-ray tube, usually consisting of a tungsten block embedded in a copper stem. Electrons flow from the cathode toward the anode and the anode emits x-rays from the focal spot.

Antegrade blood flow is the naturally direction of the flowing blood.

A tomographic imaging direction, frontwards relative to a short axis of the human body from the back to the front.

See also Anterior Posterior, Left Anterior Oblique, Right Anterior Oblique, Annotation, Antegrade.