For an erect AP projection of the shoulder, what surface of the patient will be next to the cassette?

For an erect AP projection of the shoulder, what surface of the patient will be next to the cassette?

• A. Ventral
• B. Anterior
• C. Decubitus
• D. Dorsal

Answer: (D)

In an AP projection, the X-ray beam travels from the front (anterior) to the back (posterior), and the image receptor is placed behind the patient. Therefore, the dorsal (posterior) surface of the shoulder will be against the cassette. The ventral/anterior surface would face the beam, not the film, and decubitus is a patient position rather than a surface.

In an AP projection, the X-ray beam travels from the front (anterior) to the back (posterior), and the image receptor is placed behind the patient. Therefore, the dorsal (posterior) surface of the shoulder will be against the cassette. The ventral/anterior surface would face the beam, not the film, and decubitus is a patient position rather than a surface.