Question 1

Which sinuses are best demonstrated with a parietoacanthial projection?

Accepted Answer

The answer of Which sinuses are best demonstrated with a...

Question 2

A patient enters the ED with a possible nasal bone fracture.The physician is concerned about a possible bony nasal septum deviation and fractured nasal bones.Which of the following routines would best diagnose these injuries?

Accepted Answer

The parietoacanthial (Waters view) provides a good view of the nasal septum and the lateral nasal bone projection allows for assessment of the nasal bones. The superoinferior (axial) projection is useful for evaluating the nasal bone for fractures from a superior view, making this combination of projections most suitable for diagnosing nasal bone fractures and bony nasal septum deviation.

Question 3

A radiograph of a parietoacanthial (Waters)projection reveals that the petrous ridges are superimposed over the lower 30% of the maxillary sinuses.What specific positioning error (if any)led to this radiographic finding?

Accepted Answer

The petrous ridges should be projected just below the maxillary sinuses in a proper Waters projection. If they are superimposed over the lower 30% of the maxillary sinuses, it indicates insufficient extension of the neck.

Question 4

A radiograph of a submentovertex projection reveals that the mandible is superimposed over the ethmoid and sphenoid sinuses.Which of the following modifications will eliminate this problem?

Accepted Answer

Increasing the extension of the head and neck will help separate the mandible from the ethmoid and sphenoid sinuses in the submentovertex projection.

Question 5

A patient enters the ED with a possible fracture of the proximal ramus of the mandible.Which of the following routines would best diagnose this fracture?

Accepted Answer

The PA axial mandible projection, axiolateral oblique projection with no rotation, and a 35° AP axial projection are best suited for visualizing the proximal ramus of the mandible.

Question 6

A patient enters the ED with facial bone injuries.The physician is concerned about a possible blow-out fracture of the left orbit.Which of the following three-projection routines would best diagnose this injury?

Accepted Answer

The answer of A patient enters the ED with facial...

Question 7

A radiograph of a PA projection of the sinuses reveals that the petrous ridges are projected over the ethmoid sinuses.Which of the following modifications will eliminate this superimposition while not compromising diagnostic quality?

Accepted Answer

Increasing the extension of the head and neck slightly will help to project the petrous ridges below the ethmoid sinuses, thus eliminating the superimposition without compromising the diagnostic quality of the radiograph.

Question 8

A radiograph of a lateral projection of the facial bones reveals that the mandibular rami are not superimposed.What specific positioning error is present on this radiograph?

Accepted Answer

When the mandibular rami are not superimposed, it indicates rotation of the head. This means that the patient's head was not positioned properly and was tilted or turned slightly to one side, causing the rami to appear shifted or separated.

Question 9

Which of the following projections of the mandible results in the highest skin dose?

Accepted Answer

The answer of Which of the following projections of the...

Question 10

Where is the CR centered for a lateral projection of the sinuses?

Accepted Answer

For a lateral projection of the sinuses, the central ray (CR) is centered midway between the outer canthus and the external auditory meatus (EAM) to properly visualize the sinus structures.

Question 11

Which sinuses are best demonstrated with the PA projection?

Accepted Answer

The PA (posteroanterior) projection best demonstrates the frontal and ethmoid sinuses, as it allows for a direct view of these structures without the overlying density of the skull obscuring them.

Question 12

A radiograph of a PA Caldwell projection reveals that the petrous ridges are projected into the lower one third of the maxillary sinuses.Which of the following modifications should be made during the repeat exposure to produce a more diagnostic image?

Accepted Answer

The answer of A radiograph of a PA Caldwell projection...

Question 13

Which sinus is projected through the oral cavity with a parietoacanthial transoral projection?

Accepted Answer

The sphenoid sinus is projected through the oral cavity with a parietoacanthial transoral projection. This projection allows for a direct view of the sphenoid sinus by aiming the X-ray beam through the open mouth, bypassing the dense bones of the skull that could obscure the sinus in other views.

Question 14

A patient enters the ED with a possible fracture of the right zygomatic arch.Which of the following routines would best diagnose a possible fracture of this structure?

Accepted Answer

The submentovertex and bilateral oblique inferosuperior (tangential) projections are specifically used to visualize the zygomatic arches, making them ideal for diagnosing fractures in this area.

Question 15

A radiograph of a parietoacanthial transoral (open-mouth Waters)projection reveals that the mouth is open but the sphenoid sinus is superimposed over the maxilla and upper teeth.What positioning error led to this radiographic outcome?

Accepted Answer

The answer of A radiograph of a parietoacanthial transoral (open-mouth...

Question 16

A radiograph of an axiolateral oblique projection of the mandible with the head in a lateral position reveals that the mandibular body is greatly foreshortened.Which of the following modifications is necessary to produce a more diagnostic image?

Accepted Answer

Increasing the rotation of the skull towards the image receptor will help to elongate the mandibular body in the axiolateral oblique projection, which will result in a more diagnostic image.

Question 17

The recommended digital systems kV range for the superoinferior tangential projection of the nasal bones is:

Accepted Answer

The answer of The recommended digital systems kV range for...

Question 18

A radiograph of a parietoacanthial (Waters)projection for sinuses reveals that the petrous pyramids are projected over the maxillary sinuses.What positioning error is present on this radiograph?

Accepted Answer

Excessive flexion of the neck causes the petrous pyramids to be projected over the maxillary sinuses in a Waters projection. Proper positioning requires the petrous ridges to be below the maxillary sinuses.

Question 19

Which plane or perspective is most often produced for a CT scan of the sinuses?

Accepted Answer

The coronal plane is most often produced for a CT scan of the sinuses because it allows for visualization of the paranasal sinuses in relation to each other and the surrounding structures.

Question 20

A radiograph of a parieto-orbital oblique projection for the optic foramen reveals that the optic foramen is projected into the inferior,outer orbital rim.Which of the following modifications is necessary to produce a more diagnostic image?

Accepted Answer

Decreasing the extension of the head and neck will help in repositioning the optic foramen to the correct location in the radiograph.

Quiz 11: Cranium, Facial Bones, and Paranasal Sinuses