In the Waters method for nasal bones, what is the recommended chin position?

In the Waters method for nasal bones, what is the recommended chin position?

• A. Resting on IR
• B. Elevated
• C. Tucked
• D. Hyperextended backward

Answer: (A)

In the Waters parietoacanthial view, the chin should rest on the image receptor. This positioning stabilizes the head and places the skull at the correct angle so the nasal bones and surrounding sinuses are projected without distortion. Having the chin on the IR helps achieve the intended projection by aligning the infraorbitomeatal line with the image plane, reducing the chance that the tongue or soft tissues obscure the nasal area and preventing unwanted distortion from an elevated or overly tucked chin. If the chin is raised or tucked too much, the projection changes, the nasal bones can appear distorted, and the petrous ridges may intrude into the area of interest, compromising the image. Hyperextended backward would likewise misalign the anatomy for this view.

In the Waters parietoacanthial view, the chin should rest on the image receptor. This positioning stabilizes the head and places the skull at the correct angle so the nasal bones and surrounding sinuses are projected without distortion. Having the chin on the IR helps achieve the intended projection by aligning the infraorbitomeatal line with the image plane, reducing the chance that the tongue or soft tissues obscure the nasal area and preventing unwanted distortion from an elevated or overly tucked chin. If the chin is raised or tucked too much, the projection changes, the nasal bones can appear distorted, and the petrous ridges may intrude into the area of interest, compromising the image. Hyperextended backward would likewise misalign the anatomy for this view.