Facial Bones Positioning

Question 1

Whats another name for the PA axial view facial bones?

Answer 1

Caldwell method

Question 2

Whats another name for the caldwell method facial bones?

Answer 2

PA axial

Question 3

What structures are seen in a PA axial facial bones (Caldwell method)?

Answer 3

• Orbits are equal distance from the skull borders
• Symmetric petrous ridges lying in the lower /3 of the orbit
• Exaggerated Caldwell= petrous ridges are projected below the inferior margins of the orbits

Question 4

What IR is used for facial bone views?

Answer 4

10x12

Question 5

What breathing technique is used for facial bone images?

Answer 5

Suspended respiration

Question 6

How is the patient positioned for a PA axial facial bones (Caldwell method)?

Answer 6

• Patient is prone or upright (upright is best)
• Forehead and nose rest against the table/bucky

Question 7

What do you need to check for accuracy for a PA axial facial bones (Caldwell method)?

Answer 7

Baselines

Question 8

Where is the MSP & OML in a PA axial facial bones (Caldwell method)?

Answer 8

Perpendicular to IR

Question 9

Where is the CR for a PA axial facial bones (Caldwell method)?

Answer 9

Exits at the nasion

Question 10

What SID is used for facial bone views?

Answer 10

40”

Question 11

What angle is the CR for a PA axial facial bones (Caldwell method)?

Answer 11

15 degrees caudal

Question 12

What does the exaggereated caldwell method show?

Answer 12

Shows the orbital rims

Question 13

What view shows the orbital rims for facial bones?

Answer 13

Exaggerated caldwell

Question 14

What angle is the CR for an exaggerated caldwell?

Answer 14

30 degrees caudal

Question 15

What are the structures seen for a parietoacanthial facial bones views (waters method)?

Answer 15

• Distance between the lateral border of the skull and orbit equal on each side
• Petrous ridges below maxillary sinuses
• Demonstrates the maxillae, orbits, and zygomatic arches
• Modified Waters= Petrous ridges projected immediately below the inferior border of the orbits

Question 16

How is the patient positioned for a parietoacanthial facial bones views (waters method)?

Answer 16

• Patient is prone or PA upright (upright is best)
• Chin on bucky/table
• Nose 3/4” from bucky/table

Question 17

Where is the CR for a parietoacanthial facial bones views (waters method)?

Answer 17

Exits the acanthion

Question 18

Where is the OML for a parietoacanthial facial bones views (waters method)?

Answer 18

37 degrees with plane of IR

Question 19

Where is the MML & MSP for a parietoacanthial facial bones views (waters method)?

Answer 19

Perpendicular to the plane of IR

Question 20

What does modified waters do the OML?

Answer 20

Places OML 55 degrees with the plane of IR

Question 21

What structures are seen for a left lateral facial bones view?

Answer 21

• All facial bones in their entirety, with the zygomatic bone in the center
• Almost perfectly superimposed mandibular rami
• Superimposed orbital roofs
• No rotation of sella turcica

Question 22

Where is the CR for a left lateral facial bones view?

Answer 22

Enters lateral surface of the zygomatic bone halfway between the outer canthus and EAM

Question 23

How is the patient positioned for a left lateral facial bones view?

Answer 23

Patient is prone of upright (upright is best) in LAO with head in true lateral position

Question 24

Where is the MSP for a left lateral facial bones view?

Answer 24

Parallel to IR

Question 25

Where is the IP line for a left lateral facial bones view?

Answer 25

Perpendicular to IR

Question 26

Where is the IOML for a left lateral facial bones view?

Answer 26

Perpendicular to front edge of IR