Radiographic Seminar Exam 2 Practice

Why are the paranasal sinuses imaged in the erect position?

To demonstrate air-fluid levels To reduce motion To improve contrast To increase patient comfort

Correct Answer:

To demonstrate air-fluid levels

Explanation:

Air-fluid levels are best demonstrated with the patient upright because gravity makes any fluid in the sinuses settle and form a distinct interface with air. This horizontal fluid level is a key sign of sinusitis on radiographs. When lying down, the fluid spreads and the level isn’t as visible, making it harder to detect. So imaging the paranasal sinuses erect directly enhances the ability to see these levels, which is why that position is chosen.

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