Skull Radiographic Positioning Challenge

Question 1

In a PA axial Caldwell skull projection performed for frontal and anterior ethmoid evaluation, which angulation is typically used with the orbitomeatal line perpendicular to the IR?

Accepted Answer

15° caudad

Answer

25° cephalad

Answer

30° caudad

Answer

37° caudad

Question 2

Which positioning line is placed perpendicular to the image receptor for a standard AP axial Towne method of the skull?

Accepted Answer

Orbitomeatal line

Answer

Infraorbitomeatal line

Answer

Acanthiomeatal line

Answer

Glabellomeatal line

Question 3

A lateral skull radiograph shows the mandibular rami not perfectly superimposed. This most commonly indicates an error in which aspect of positioning?

Accepted Answer

Head rotation

Answer

Excessive chin extension

Answer

Insufficient CR angulation

Answer

Shoulder elevation

Question 4

For a submentovertex skull projection intended to demonstrate the zygomatic arches free of superimposition, which baseline should be nearly parallel to the IR?

Accepted Answer

Infraorbitomeatal line

Answer

Interpupillary line

Answer

Midsagittal plane

Answer

Orbitomeatal line

Question 5

In the AP axial Towne projection of the skull, the dorsum sellae and posterior clinoids should be projected within which structure when positioning is correct?

Accepted Answer

Foramen magnum

Answer

Sella turcica floor

Answer

Superior orbital fissure

Answer

Hypoglossal canal

Question 6

A patient cannot flex the neck sufficiently for a standard Towne projection with the OML perpendicular. What is the commonly accepted alternative CR angulation using the IOML perpendicular instead?

Accepted Answer

37° caudad

Answer

20° caudad

Answer

25° cephalad

Answer

30° cephalad

Question 7

Which projection best demonstrates the occipital bone and posterior parietal region with minimal facial bone superimposition in routine skull imaging?

Accepted Answer

AP axial Towne

Answer

PA axial Caldwell

Answer

Lateral skull

Answer

Parietoacanthial Waters

Question 8

When evaluating for equal distance from the lateral orbital margins to the skull on a PA skull image, the technologist is primarily checking for lack of which positioning error?

Accepted Answer

Rotation

Answer

Tilt

Answer

Extension

Answer

Off-centering

Question 9

For a true lateral skull, which relationship confirms that there is no tilt of the head?

Accepted Answer

Orbital roofs superimposed

Answer

Sella turcica centered over the frontal sinus

Answer

Petrous ridges filling the orbits

Answer

Mandibular condyles below the mastoids

Question 10

Which central ray location is standard for a lateral projection of the skull?

Accepted Answer

Midway between the EAM and outer canthus

Answer

2 inches superior to the nasion

Answer

1 inch inferior to the glabella

Answer

Through the acanthion

Question 11

If the petrous pyramids are projected too low on a PA axial Caldwell skull image, what is the most likely technical cause?

Accepted Answer

Insufficient caudal angulation

Answer

Excessive caudal angulation

Answer

Excessive SID

Answer

Head rotated toward the tube

Question 12

For a routine PA skull rather than a PA axial Caldwell, where should the petrous ridges appear on a correctly positioned image?

Accepted Answer

Filling the orbits

Answer

In the lower third of the orbits

Answer

Just below the maxillary sinuses

Answer

Completely beneath the mandible

Question 13

In the submentovertex projection, the central ray is directed perpendicular to the IOML and enters at a point between the mandibular angles to exit at which landmark?

Accepted Answer

Vertex

Answer

Acanthion

Answer

Nasion

Answer

Glabella

Question 14

Which image receptor orientation is generally preferred for a lateral skull on an adult to include the entire cranium efficiently?

Accepted Answer

10 × 12 inch IR lengthwise

Answer

14 × 17 inch IR crosswise

Answer

10 × 12 inch IR crosswise

Answer

8 × 10 inch IR lengthwise

Question 15

A technologist wants to best demonstrate the zygomatic arches without superimposition from the cranial bones. Which modification is classically used with the SMV setup?

Accepted Answer

Use a tangential SMV approach

Answer

Center 1 inch above the nasion

Answer

Use a 15° caudad angle

Answer

Apply slight cephalic hyperextension only

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