Which statement is true about patient positioning for the SMV projection?

Which statement is true about patient positioning for the SMV projection?

• A. The patient lies supine with the head rotated 90 degrees.
• B. The patient stands or sits at the upright Bucky.
• C. The patient stands with the head in a 45-degree oblique position to the IR.
• D. The patient sits with head flexed toward the chest.

Answer: (B)

The key idea is that the SMV projection is done with the patient upright. Standing or sitting at the upright Bucky positions the body so the superior mesenteric vein lies along the plane of the film and gravity helps move bowel gas and contents out of the way, reducing overlap and giving a clearer view of the venous structures. This upright geometry provides the best chance to visualize the SMV without distortion. Positions that involve lying down or unusual head or neck placements don’t optimize the abdominal venous anatomy for this view, so they’re not used for this projection.

The key idea is that the SMV projection is done with the patient upright. Standing or sitting at the upright Bucky positions the body so the superior mesenteric vein lies along the plane of the film and gravity helps move bowel gas and contents out of the way, reducing overlap and giving a clearer view of the venous structures. This upright geometry provides the best chance to visualize the SMV without distortion. Positions that involve lying down or unusual head or neck placements don’t optimize the abdominal venous anatomy for this view, so they’re not used for this projection.