A portable AP chest radiograph demonstrates clavicle superimposition over the lung apices. How should this error be corrected?

A portable AP chest radiograph demonstrates clavicle superimposition over the lung apices. How should this error be corrected?

• A. adjust tube angulation
• B. adjust receptor position
• C. instruct patient to increase inhalation
• D. instruct patient to elevate shoulders

Answer: (A)

The key idea is how beam geometry affects what sits where on the image. When the clavicles are projected over the lung apices on a portable AP chest radiograph, it’s a projection artifact caused by the angle of the X-ray beam relative to the thorax. By adjusting the tube angulation, you change the ray path so the clavicles no longer obscure the apices, allowing a clearer view of the upper lungs. Inhalation depth or receptor placement won’t fix this overlap because they don’t alter the projection of the clavicles relative to the apices. Elevating the shoulders tends to move the clavicles into a higher position on the image, making the problem worse.

The key idea is how beam geometry affects what sits where on the image. When the clavicles are projected over the lung apices on a portable AP chest radiograph, it’s a projection artifact caused by the angle of the X-ray beam relative to the thorax. By adjusting the tube angulation, you change the ray path so the clavicles no longer obscure the apices, allowing a clearer view of the upper lungs.

Inhalation depth or receptor placement won’t fix this overlap because they don’t alter the projection of the clavicles relative to the apices. Elevating the shoulders tends to move the clavicles into a higher position on the image, making the problem worse.