American Registry of Radiologic Technologists (ARRT) Practice Exam

Question: 1 / 400

In which view is the OML positioned at a 37° angle?

Waters

The Waters view, also known as the parietoacanthial projection, involves positioning the OML (orbitalmeatal line) at a 37° angle relative to the receptor plane. This positioning is crucial for optimal visualization of the maxillary sinuses, as it allows the X-ray beam to pass along the OML while ensuring that the petrous ridges are projected below the maxillary sinuses.

In contrast, the Caldwell view requires the OML to be perpendicular to the receptor, which is a different angle altogether. The lateral view typically has the midsagittal plane perpendicular to the receptor without a specific angling of the OML. The PA (posteroanterior) view, like the Caldwell, also has the OML perpendicular to the image receptor, making its angulation distinct from that used in the Waters view. Thus, the Waters view’s specific angling of the OML is key to its designation as the correct answer.

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Caldwell

Lateral

PA

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