RTBC-Skull

Question 1

Which cranial bone is best visualized on the anteroposterior (AP) axial projection of the skull, Towne method?

Answer 1

Occipital bone

Question 2

Which projection demonstrates the frontal bone with minimal distortion and superimposition?

Answer 2

posteroanterior (PA) axial projection, Caldwell method

Question 3

On a properly positioned posteroanterior (PA) axial projection of the skull (Caldwell method), the central ray exits at the level of the:

Answer 3

Nasion

Question 4

The articulation of the frontal bones with the nasal bones is known as the:

Answer 4

Nasion

Question 5

What is the degree difference between the orbitomeatal line (OML) and the infraorbitomeatal line (IOML)?

Answer 5

7 degrees

Question 6

The pterygoid process is a part of which bone?

Answer 6

Sphenoid

Question 7

On a parietoancanthial projection of the paranasal sinuses, Waters method, the petrous ridges should:

Answer 7

be projected just below the maxillary sinuses

Question 8

The line that extends through the midline of the orbits is also known as the:

Answer 8

Interpupillary line

Question 9

Which facial bone is found in the medial wall of the orbit between the ethmoid and the maxilla?

Answer 9

Lacrimal

Question 10

When performing a lateral projection to evaluate facial bones, the central ray entrance point is:

Answer 10

midway between outer canthus and the external auditory meatus (EAM)

Question 11

How should the central ray be directed when performing a posteroanterior (PA) (Caldwell method) of the sinuses with a vertical image receptor?

Answer 11

Horizontal

Question 12

In which bone are the optic foramina located?

Answer 12

Sphenoid bone

Question 13

When the patient is properly positioned for a posteroanterior (PA) axial projection of the skull, Caldwell method, what two anatomic structures will be in contact with the image receptor?

Answer 13

nose and forehead

Question 14

The parietoacanthial projection of the sinuses (modified Waters), in which the central ray passes through the patient’s open mouth, best demonstrates which paranasal sinus?

Answer 14

Sphenoid

Question 15

A properly positioned posteroanterior (PA) axial projection of the average skull, or Caldwell method, will project the petrous ridges:

Answer 15

In the lower third of orbits

Question 16

Which group of paranasal sinuses is located directly inferior and anterior to the sella turcica?

Answer 16

Sphenoidal

Question 17

Which three bones does the temporal bone articulate?

Answer 17

Parietal, Occipital, and Sphenoid

Question 18

For a parietoacanthial projection, Waters method, the first step in positioning is to have which body part(s) resting against the image receptor (IR)?

Answer 18

Chin

Question 19

What is most likely indicated if an air-fluid level is seen in the sphenoid sinus on a lateral skull radiograph?

Answer 19

Basal skull fracture

Question 20

The hard palate is formed by which bones?

Answer 20

Maxilla and Palatine

Question 21

Which projection requires the patient to extend the neck until the infraorbitomeatal line (IOML) is parallel to the image receptor?

Answer 21

Submentovertical (SMV) projection

Question 22

Which cranial bone contains a petrous portion and mastoid air cells?

Answer 22

Temporal bone

Question 23

Which type of fracture occurs only in the orbit?

Answer 23

Blowout

Question 24

Which sinuses are visualized on a properly positioned lateral projection radiograph?

Answer 24

Ethmoid, Frontal, Maxillary, and Sphenoid

Question 25

What radiographic positioning landmark corresponds to the location of the anterior nasal spine?

Answer 25

Acanthion