Facial Bones - Radiology Flashcards

1
Q

With reference to the patient, where should the central ray be directed for the lateral projection of the facial bones?

A

Zygomatic bone

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2
Q

With reference to the IR, how should the central ray be directed for the parietoacanthial projection, Waters method?

A

Perpendicular

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3
Q

Where should the petrous ridges be seen in the image of the parietoacanthial projection of the facial bones?

A

Below the maxillary sinuses

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4
Q

Which positioning line and angle indicate correct positioning of the head for the parietoacanthial projection, Waters method?

A

OML; 37 degrees to the IR

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5
Q

Which evaluation criterion pertains to the parietoacanthial projection, Waters method?

A

The petrous ridges should be projected immediately below the maxillary sinuses

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6
Q

Which evaluation criterion pertains to the PA axial projection, Caldwell method?

A

The distance between the lateral border of the skull and orbit should be the same on both sides

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7
Q

Which evaluation criterion pertains to the lateral projection of the facial bones?

A

the orbital roofs should be superimposed.

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8
Q

Which evaluation criterion pertains to the SMV projection for bilateral zygomatic arches?

A

The zygomatic arches should be free from the overlying structures

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9
Q

An AP axial projection (modified Towne method) of the bilateral zygomatic arches produces an image similar to the AP axial projection (Towne method) of the skull. How many degrees and in what direction should the central ray be directed for this projection to demonstrate zygoatic arches when the OM> is perpendicular to the IR?

A

30 degrees caudad

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10
Q

An AP axial projection (modified Towne method) of the bilateral zygomatic arches is performed similarly to the AP axial projection (Towne mehtod) of the skull, except that the projection for the zygomatic arches requires that which of the following be done?

A

The central ray should be directed to the glabella

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11
Q

With reference to the IR, how should the midsagittal plane be adjusted for the tangetial projection demonstrating an individual zygomatic arch?

A

15 degrees from perpendicular

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12
Q

To demonstrate the mandibular body with the axiolateral oblique projection, how should the patient’s head be positioned?

A

From true lateral, rotate the head 30 degrees toward the IR

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13
Q

How many degrees and in which direction should the central ray be directed for the axiolateral projection of the mandible?

A

25 degrees cephalad

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14
Q

Which projection is performed with the patient’s head positioned true lateral and the central ray directed 25 degrees cephalad?

A

Axiolateral projection of the mandible

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15
Q

Which evaluation criterion pertains to the axiolateral oblique projection of the mandible?

A

The opposite side of the mandible should not overlap the ramus

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16
Q

Which structure is of primary interest when the patient’s head is rotated 15 degrees toward the IR from a true lateral position and the central ray is directed 15 degrees caudal, entering about 1 1/2 inches (3.8 cm) superior to the upside EAM?

A

TMJ

17
Q

Which of the following structures can be well demonstrated with an axiolateral oblique projection?

A

TMJs

18
Q

How many degrees and in which direction should the central ray be directed for the axiolateral oblique projection for TMJs?

A

15 degrees caudad

19
Q

For the AP axial projection of the TMJs, where should the central ray be directed?

A

3 inches (7.6 cm) above the nasion

20
Q

With reference to the patient, where should the IR be centered for the axiolateral oblique projection of the TMJs?

A

1/2 inche (1.2 cm) anterior to the EAM