Skull Prep

Question 1

GML stands for

Answer 1

Glabellomeatal line

Question 2

OML stands for

Answer 2

Orbitomeatal line

Question 3

IOML stands for

Answer 3

Infraorbitomeatal line

Question 4

AML stands for

Answer 4

Acanthiomeatal line

Question 5

LML stands for

Answer 5

Lips-meatal line

Question 6

MML stands for

Answer 6

Mentomeatal line

Question 7

CR angle for AP Axial Cranium (Towne Method)

Answer 7

30 degrees caudal to OML
- or -
37 degrees caudal to IOML

Question 8

CR centering for AP Axial Cranium (Towne Method)

Answer 8

At MSP 2.5 inches above glabella

Question 9

For the Towne Method, the ______ ______ should be symmetric

Answer 9

Petrous ridges

Question 10

Correct CR angle and proper neck flexing in the Towne Method are indicated by _________

Answer 10

Dorsum sellae and posterior clinic processes visualized in the foremen magnum

Question 11

Lateral cranium CR angle

Answer 11

Perpendicular

Question 12

Positioning for Towne method

Answer 12

Depress chin, bringing OML perpendicular to the IR (if patient unable to flex, IOML perpendicular)

Question 13

CR centering for Lateral Cranium

Answer 13

2 inches superior to EAM or halfway between glabella and inion for other types of skull morphologies

Question 14

No tilt in a lateral cranium will be indicated by ______

Answer 14

Superimposed orbital plates (roof)

Question 15

No rotation in a lateral cranium will be indicated by ______

Answer 15

Superimposition of greater wings of sphenoid and mandibular rami

Question 16

Caldwell method positioning, facing (board/tube)

Answer 16

OML perpendicular to IR, facing board

Question 17

The Towne Method is (a/an) ___ projection

The Caldwell Method is (a/an) ___ projection

Answer 17

AP axial, PA or PA axial

Question 18

PA Caldwell CR angle and centering

Answer 18

Perpendicular, exit at glabella

Question 19

PA Axial Caldwell CR angle and centering

Answer 19

15 caudad to OML, exit at nasion

Question 20

What does SMV stand for?

Answer 20

Submentovertical

Question 21

Patient position for SMV

Answer 21

hyperextend neck to get IOML parallel to IR, rest head on vertex

Question 22

CR angle for SMV

Answer 22

Perpendicular to IOML

Question 23

CR centering for SMV

Answer 23

1.5 inches inferior to mandible symphysis or midway between gonions (approx. 0.75 inches anterior to level of EAM)

Question 24

Patient position for facial bones

Answer 24

Lateral side of head (side of interest) on IR

Question 25

CR angle for facial bones

Answer 25

Perpendicular

Question 26

CR centering for facial bones

Answer 26

Zygoma (prominence of cheek), midway between outer canthus and EAM

Question 27

Patient positioning for Waters

Answer 27

Extend neck to get MML perpendicular to IR ~OR~ OML 37 degrees to IR

Question 28

CR angle for Waters

Answer 28

Perpendicular

Question 29

CR centering for Waters

Answer 29

Exit at acanthion

Question 30

Patient positioning Modified Waters

Answer 30

OML 55 degrees to plane of IR/LML perpendicular to IR

Question 31

CR angle Modified Waters

Answer 31

Perpendicular

Question 32

CR centering Modified Waters

Answer 32

Exit at acanthion

Question 33

What is the technical name for Waters/Modified Waters?

Answer 33

Parietoacanthial/Modified Parietoacanthial

Question 34

IPL stands for

Answer 34

Interpupillary line

Question 35

How would you do a reverse Waters (in a trauma scenario)?

Answer 35

-AP projection -CR parallel to MML, centering at acanthion

Question 36

How would you do a reverse Modified Waters (in a trauma scenario)?

Answer 36

-AP projection -CR parallel to junction of LML centering at acanthion

Question 37

Patient positioning for nasal bones

Answer 37

Head in true lateral position

Question 38

CR angle for nasal bones

Answer 38

Perpendicular

Question 39

CR centering for nasal bones

Answer 39

0.5” inferior to nasion

Question 40

Patient positioning Bilateral SMV for Zygomatic Arches

Answer 40

extend neck to get IOML parallel to IR

Question 41

CR angle for Bilateral SMV for Zygomatic Arches

Answer 41

Perpendicular to IOML (likely perpendicular to board)

Question 42

CR centering for Bilateral SMV for Zygomatic Arches

Answer 42

~1.5 inches inferior to mandibular symphysis

Question 43

The parieto-orbital oblique is also called ———-

Answer 43

Rhese Method