Why is sinus radiography performed with the patient in the upright position?

Sinus radiography is performed with the patient in the upright position primarily to demonstrate air/fluid levels within the sinuses. This positioning allows gravity to facilitate the separation of air and fluid in the sinus cavities, making it easier to visualize any potential fluid accumulation, which could indicate the presence of conditions such as sinusitis or infection. When the patient is upright, any fluid will naturally settle at the lowest point in the sinus space, thus providing a clearer distinction between the air and any fluid present. Consequently, the images obtained can effectively reveal whether there are abnormal fluid levels that might necessitate further medical evaluation or intervention.

While reducing motion and enhancing patient comfort are also important considerations in radiography, they do not specifically pertain to the primary goal of visualizing air/fluid levels. Similarly, the visualization of bony structures is a relevant aspect of sinus radiography but is secondary to the primary aim of evaluating fluid status in the sinuses.