Head and Neck Procedures Flashcards

Which projection best demonstrates the mandibular condyles in the axiolateral oblique position?

Answer: Towne projection

The Towne (AP axial) projection with additional modifications demonstrates the mandibular condyles by projecting them below the mastoid processes.

When positioning for a lateral projection of the sella turcica, the central ray enters at which landmark?

Answer: 1 inch anterior and 1 inch superior to the EAM

For a lateral sella turcica, the CR enters approximately 3/4 inch anterior and 3/4 inch superior to the external auditory meatus (EAM).

On the AP axial (Towne) projection, the dorsum sellae and posterior clinoid processes are projected into which structure?

Answer: Foramen magnum

The Towne projection projects the dorsum sellae and posterior clinoid processes through the foramen magnum.

For a radiograph of the zygomatic arch using the oblique inferosuperior projection, the CR is directed at what angle?

Answer: 15° medially

For the oblique inferosuperior (tangential) zygomatic arch projection, the CR is angled approximately 15° medially and 15° cephalically.

Which structure is best seen on the open-mouth Waters view of the face?

Answer: Sphenoid sinuses

The open-mouth Waters view projects the sphenoid sinuses through the open mouth, making them visible without overlying structures.

On a properly positioned lateral skull radiograph, the sella turcica should appear how?

Answer: As a single image without superimposition

A properly positioned lateral skull shows the sella turcica as a single, non-double-contoured image, indicating true lateral positioning.

For an AP projection of the cervical spine, the CR is angled how to open the intervertebral disk spaces?

Answer: 15–20° cephalad

For AP cervical spine, the CR is angled 15–20° cephalad to open the intervertebral disk spaces and reduce the lordotic curve.