What is the recommended patient position for the SMV projection of the skull?

• A. Standing or sitting at the upright Bucky.
• B. Seated with face parallel to IR.
• C. Lying prone with head extended.
• D. Standing with head turned 45 degrees.

Answer: (A)

The SMV projection images the skull base from below, so you need the head in a position that brings the vertex close to the image receptor and aligns the infraorbital-meatal line with the plane of the image receptor. Standing or sitting at the upright Bucky accomplishes this best: the patient can extend the neck enough to elevate the vertex, and the upright setup helps maintain stability and alignment while allowing the CR to be directed perpendicular to the IOML. This orientation reduces superimposition from the facial bones and ensures the foramen magnum and cranial base are visualized clearly.

Other positions would compromise the view: turning the head or lying prone can distort or obscure the base of the skull, and not having the head correctly extended or not using an upright setup can misalign the IOML with the IR, leading to incorrect projection.