When should the exposure be made for an AP or lateral projection of the upper airway?

For an AP or lateral projection of the upper airway, the exposure should be made during a slow, deep inspiration. Taking the exposure at this point ensures that the airway is fully expanded, providing a clearer view of the anatomical structures. During deep inspiration, the lungs and trachea are filled with air, which allows for better delineation of the soft tissues of the upper airway, including the larynx and pharynx. This clarity is crucial for accurate diagnosis and assessment of any potential abnormalities or conditions affecting the airway.

Additionally, capturing the image during a slow, deep inspiration helps to minimize motion blur, as patients are often better able to hold their breath steadily at this point compared to a rapid breathing pattern. This approach optimizes image quality, which is essential in radiography for precise diagnostics.