Air-fluid levels on an AP chest projection
1)demonstrate an increase in density where the fluid is present.
2)are formed when air and fluid separate.
3)are precisely demonstrated when the patient is in a partially upright position.
4)are precisely demonstrated when the central ray is horizontal.
A) 1 and 3 only
B) 1, 2, and 4 only
C) 2 and 4 only
D) 2, 3, and 4 only

Question

Quizplus · Accepted Answer

Air-fluid levels are formed when air and fluid separate within a cavity, and they are best demonstrated when the central ray is horizontal, allowing the fluid to level out and the air to rise above it.

Air-Fluid Levels on an AP Chest Projection