Skull Positioning

Question 1

Where will the petrous ridges be projected on a properly positioned PA Axial (Caldwell)?

Answer 1

lower 1/3 of the orbits

Question 2

What is demonstrated through the shadow of the foramen magnum on a Towne position?

Answer 2

dorsum sella

Question 3

What two parts of the patient’s anatomy (skull) would be touching the table for a PA Caldwell?

Answer 3

nose and forehead

Question 4

For the SMV projection, which of the following should be parallel to the plane of the film?

Answer 4

infraorbitomeatal line

Question 5

The orbitomeatal line is perpendicular to the film, the CR is angled 15 degrees caudal. What projection/position is this?

Answer 5

PA Caldwell

Question 6

Which of the following would best demonstrate the frontal bone?

Answer 6

caldwell

Question 7

Which of the following would best demonstrate the occipital bone?

Answer 7

Towne

Question 8

On which cranial bone is the sella turcica located?

Answer 8

sphenoid

Question 9

Which of the following is best demonstrated on an SMV skull?

Answer 9

base of cranium

Question 10

What is the posterior portion of the sella turcica called?

Answer 10

dorsum sella

Question 11

____ perpendicular to IR for Towne position.

Answer 11

OML

Question 12

Tube angle for Towne (OML perpendicular to IR)

Answer 12

30 caudal

Question 13

Tube angle for Towne (IOML perpendicular to IR)

Answer 13

37 caudal

Question 14

CR centering for Towne

Answer 14

2.5 inches above glabella at MSP

Question 15

For Towne, underangulation of CR or insufficient flexion of neck projects the _____ superior to the foramen magnum.

Answer 15

dorsum sellae

Question 16

This position may demonstrate air-fluid levels in the sphenoid sinus

Answer 16

Lateral skull

Question 17

_____ perpendicular to IR for lateral skull

Answer 17

IPL

Question 18

Adjust neck flexion to align ____ perpendicular to front edge of IR for lateral skull

Answer 18

IOML

Question 19

CR centering for lateral skull

Answer 19

2 inches superior to EAM

Question 20

Demonstrated in profile for lateral skull

Answer 20

Sella turcica and clivus

Question 21

____ perpendicular to IR for Caldwell

Answer 21

OML

Question 22

CR centered to exit at the ___ for Caldwell

Answer 22

Nasion

Question 23

For Caldwell, if the distance between the right lateral orbit and lateral cranial cortex is greater than the left side, the face is rotated toward the:

Answer 23

Left side

Question 24

____ perpendicular to IR for PA skull

Answer 24

OML

Question 25

CR centered to exit at ___ for PA skull

Answer 25

glabella

Question 26

____ parallel to IR for SMV

Answer 26

IOML