Chpt 11 facial bones and sinuses self test

Question 1

The majority of the hard palate is formed by:

Answer 1

maxilla

Question 2

which of the following is not an aspect of the maxilla?

frontal process
body
zygomatic process
ramus

Answer 2

ramus

Question 3

what facial bone is considered the “unpaired bone in the adult”?

Answer 3

mandible

Question 4

what facial bone is considered located anteriorly in medial aspect of orbit?

Answer 4

lacrimal bones

Question 5

what facial bone possesses a vertical and horizontal portion?

Answer 5

palatine bones

Question 6

what facial bone helps to mix air drawn into nasal cavity?

Answer 6

inferior nasal conchae

Question 7

what facial bone lies just anterior and medial to the frontal process of maxilla?

Answer 7

nasal bones

Question 8

what facial bone contains four processes?

Answer 8

maxilla

Question 9

what facial bone forms the lower outer aspect of orbit?

Answer 9

zygomatic bone

Question 10

on avg, how many separate cavities make up the frontal sinus?

Answer 10

1-2 sinuses

Question 11

all of the paranasal sinuses are contained within cranial bones, except the maxillary sinuses.

Answer 11

true

Question 12

the frontal sinuses are usually larger in men than in women.

Answer 12

true

Question 13

which aspect of the ethmoid bone contains the ethmoid air cells?

Answer 13

lateral masses/labrinth

Question 14

the sphenoid sinus lies directly inferior to the:

Answer 14

sella turcica

Question 15

facial bone studies should be performed erect whenever possible

Answer 15

true

Question 16

which frontal projection of the facial bones best visualizes the region of the maxilla and orbits?

Answer 16

parietoacanthial (Waters)

Question 17

which single projection of the facial bones best demonstrates any possible air-fluid levels in the paranasal sinuses if the pt cannot stand or sit erect?

Answer 17

horiz. beam lat. (x-table)

Question 18

which plane is placed parallel to the IR with a true lat projection of the facial bones?

Answer 18

MSP

Question 19

what is the angle between the OML and plane of IR with a parietoacanthial (Waters) projection?

this places the _________ positioning perpendicular to the IR.

Answer 19

37°

MML

Question 20

The CR is centered to exit at the level of the ____________ for a well-positioned 15° PA axial proj. of the facial bones

Answer 20

nasion

Question 21

The CR is centered to exit at the level of the _________ for a well positioned parietoacanthial proj.

Answer 21

acanthion

Question 22

which positioning line is placed perpendicular to the IR for a modified parietoacanthial proj.

Answer 22

LML

Question 23

Where is the CR centered for a lateral projection of the nasal bones?

Answer 23

.5” to nasion

Question 24

which positioning line, if placed, parallel to IR, ensures adequate extension of the head for the SMV proj. for zygomatic arches?

Answer 24

IOML

Question 25

how much skull tilt and rotation are required for the oblique inferosuperior (tangential) proj. for zygomatic arches?

Answer 25

15° rotation and tilt toward affected side

Question 26

how much CR angle is required for the AP axial projection of the zygomatic arches if the IOML is placed perp. to the IR?

Answer 26

37° caudad

Question 27

Where should the optic foramen be located with a well-positioned three point landing projection?

Answer 27

lower outer quandrant of orbit

Question 28

How much skull rotation (from lateral position) toward the IR is required for the axiolateral oblique projeciton specifically for the mentum?

Answer 28

45°

Question 29

What type of Cr angulation should be used for a PA axial projection of the mandible?

Answer 29

20-25° cephalad

Question 30

Were is the CR centered for an SMV projection of the mandible?

Answer 30

1.5” inf. to mandibular symphysis

Question 31

A grid is not required for the lateral projection of the nasal bones.

Answer 31

true

Question 32

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

Answer 32

midway between outer canthus and EAM

Question 33

Why should a pt remain in an erect position for at least 5 mins before sinus radiography?

Answer 33

to allow any fluid in sinuses to settle

Question 34

Which routine projection is best for demonstrating the maxillary sinuses?

Answer 34

parietoacanthial (Waters)

Question 35

A radiograph of a 15° PA projection of the facial bones shows the petrous ridges are projected at the level of the midorbital rims. What specific positioning or CR angling error led to this radiographic outcome?

Answer 35

excessive flexion of head or CR angle

Question 36

A radiograph of lateral position for paranasal sinuses shows the greater wings of the sphenoid bone are not superimposed. What positioning error is present?

Answer 36

rotation

Question 37

A patient with severe facial bone injuries comes into the ER. The patient is wearing a cervical collar and cannot be moved. What type of positioning routine should be performed for this situation?

Answer 37

reverse Waters with use of cephalic CR angle and horizontal beam lateral projection

Question 38

A superoinferior tangential projection for the nasal bones was taken with the following exposure factors: 8 x 10” IR portrait, 90 kVp, 13 mAs, 40 inch SID. The resultant radiograph was unsatisfactory because of poor visibility of the nasal bones. Which technical factor should be changed for the repeat exposure?

Answer 38

reduce kVp to 50 to 60 and increase mass accordingly

Question 39

patient with possible facial fractures, including a possible blowout fracture to the right orbit was brought from the ER to the radiology department. What special facial bone projection should be included with a basic facial bone routine of a lateral parietoacanthial (waters), and PA axial (Caldwell)?

Answer 39

modified waters or PA axial with 30° caudad angle

Question 40

A patient with a clinical history of secondary osteomyelitis, comes to the radiology department. Which imaging modalities or procedures can be performed to demonstrate the extent of damage to the paranasal sinuses?

Answer 40

routine sinus series or CT of sinuses