Question

Concerning entrance surface doses (ESDs) in adults (national diagnostic reference levels, 2007)

a. Chest posterior–anterior (PA) radio graph = 0.2 mGy

b. Abdominal radio graph = 2 mGy

c. A lumbar spine anterior–posterior (AP) radio graph is greater than a pelvis AP radio graph

d. Imaging the vertebral column typically requires a greater dose for the AP view compared with the lateral (LAT) view

e. A LAT view of the skull is greater than a PA view

Answer 1

a. True.

b. False. It is 6 mGy.

c. True. (6 mGy versus 4 mGy).

d. False. The reverse is true and is related to the amount of tissue that the X-ray beam needs to pass through.

e. False. The skull has a greater sagittal length than coronal length.