Which projection uses a horizontal beam and is described as open-mouth Waters method for sinuses?

Which projection uses a horizontal beam and is described as open-mouth Waters method for sinuses?

• A. Lateral projection
• B. Open-mouth Waters method
• C. SMV projection
• D. Caldwell projection

Answer: (B)

The idea being tested is a sinus radiograph technique that uses the Waters positioning with the patient’s mouth open, combined with a horizontal central ray, to visualize the sphenoid sinuses. Opening the mouth changes the anatomy in front of the sphenoid area, reducing overlap from the palate and maxillary teeth. Using a horizontal beam through the mouth area allows the X-ray to pass into the sphenoid region more directly, enhancing visibility of those sinuses that might be obscured otherwise. This specific open-mouth Waters setup is what distinguishes it from other sinus views, such as lateral, SMV, or Caldwell projections, which do not involve an open mouth or this horizontal-beam approach.

The idea being tested is a sinus radiograph technique that uses the Waters positioning with the patient’s mouth open, combined with a horizontal central ray, to visualize the sphenoid sinuses. Opening the mouth changes the anatomy in front of the sphenoid area, reducing overlap from the palate and maxillary teeth. Using a horizontal beam through the mouth area allows the X-ray to pass into the sphenoid region more directly, enhancing visibility of those sinuses that might be obscured otherwise. This specific open-mouth Waters setup is what distinguishes it from other sinus views, such as lateral, SMV, or Caldwell projections, which do not involve an open mouth or this horizontal-beam approach.