Imaging Procedure-Test #4 (facial bones)

MSP IOML

What positioning lines are parallel to the IR for a lateral facial bone

inter pupillary line

what line is perpendicular to the IR for a lateral facial bone

zygoma half way between outer cants and EAM

where does the CR enter for a lateral facial bone

sella turcia

when performing a lateral facial bone collimation needs to include back to what structure

37

the OML forms a ___ degree angle to the IR for a parietoacanthial projection, water method

MML almost perpendicular and MSP

what positioning line is almost perpendicular to the IR for a parietoacanthial projection, waters method?

perpendicular and exits the acanthion

where does the CR exit for a parietoacanthial projection, waters method?

below the maxillary sinuses

where should the petrous ridges be demonstrated on a parietoacanthial projection waters method

55 degree

the OML forms a ___ degree angle to the IR for a modified parietoacanthial projection modified waters method

CR exits acanthion

where does the CR exit for a modified parietoacanthial projection modified water method

halfway ill the maxillary sinuses

where are the petrous ridges demonstrated on a parietoacanthial projection modified waters method

OML is perpendicular to IR

what positioning line is perpendicular to the IR for a PA axial caldwell method of the facial bones

15 degrees caudal

what tube angle/direction for a PA axial caldwell method of the facial bones?

CR exits at nasion

where does the CR exit for a PA axial caldwell method of the facial bones?

in lower third of orbit

where are the petrous ridges demonstrated on a PA axial Caldwell method of the facial bones

for comparison

why is it important to image both R and L lateral nasal bones

MSP parallel to IR, IP line perpendicular, IOML parallel with axis of IR

what positioning line is parallel to the IR for a lateral nasal bones?

enters bridge of nose ½ distal to nasion

where does the CR enter for a lateral nasal bones

IOML

what positioning line should be parallel to the IR for SMV zygoma

perpendicular to IOML and enters MSP of throat at a level 1 in posterior to outer canthus

where does the CR enter for SMV zygoma

they should be symmetrical and no foreshortening - they form overlaying arches

what happens to the zygomatic arch if there is rotation

MSP of head 15 degrees towards the side being examined rotate

what is the patient rotation for tangential zygoma

tilt the tip of the head 15 degree away from side being examined

what is the patient tilt for tangential zygoma

perpendicular to IOML and centered to the zygomatic arch at point 1 in posterior to outer canthus

where does the CR enter for the tangential projection zygomatic arch

MML

what positioning line is perpendicular for acanthioparietal projection reverse waters method

that there is magnification and more distorted when done AP

what is the major different between parietoacanthial projection and acanthioparietal projection reverse waters method

superior orbital fissure

1

zygoma

2

inferior orbital fissure

3

vomer

4

maxilla

5

mandible

6

lacrimal bone

7

ethmoid bone

8

infraorbital foramen

9

inferior nasal spine

10

lacrimal bone

11

anterior nasal spine (acanthion)

12

zygoma

13

maxilla

14

mandible

15

external acoustic meatus

16

sella turcica

17

eam

18

mandible

19

orbit

20

zygomatic arch

21

maxillary sinus

22

petrous ridges

23

zygomatic arch

24

temporal bone

25

nasal bone

26

2

how many nasal bones

2

how many lacrimal bones

lacrimal bones, form lacrimal fossa with mail and lacrimal foramen

what are the smallest bones of the skull

2

how many maxillary

maxillary

what is the largest immoveable bone of the face

floor of nasal cavity and forms inferior nasal septum

what is vomer and what does it form

2, long thin scroll like appearance, warm moisten clean inhaled air

what is the inferior nasal conchae, how many and what does it do

2, L shaped with horizontal and vertical plates, forms part of roof of the mouth and posterior nasal cavity, tip of vertical plate forms part of posteromedial orbit

how may palatine bones are they are what are they and what do they form

prominence of cheek, part of side wall and floor of orbit, forms zygomatic arch with temporal bone

what are the zygomatic bones and how many are they and what they form

glabellomeatal line, starts at EAM and ends at the glabella

What is the GML where it starts and ends

Orbitomeatal line, starts at EAM and ends at outercanthus

What is the OML where it starts and ends

infraorbitomeatal line starts at EAM and ends at the infraorbital margin which is the bony ridge directly beneath eye socket

What is the IOML where it starts and ends

acanthiomeatal line, starts at EAM and ends at the acanthion the midpoint of the base of the nose

What is the AML where it starts and ends

labiomeatal line starts at the EAM and ends at the lip margin where the lips meet

What is the LML where it starts and ends

mentomeatal line starts at the EAm and ends at the mentum which is the prominent point of the chin

What is the MML where it starts and ends

Get

Over

It

And

Love

Me

what is a way to remember the lines of the face top to bottom

maxillary bones

The largest immovable facial bones are the:

palatine

Which facial bone is located at the posterior portion of the roof of the mouth?

vomer

Which facial bone is located in the midline at the floor of the nasal cavity?

lateral projection of the facial bones

The patient is positioned upright, with the MSP of the head parallel and the interpupillary line perpendicular to the image receptor. The central ray is perpendicular and enters the zygomatic bone. What projection is being used, and which anatomy is best demonstrated?

OML perpendicular

Which baseline is used to position the PA axial projection (Caldwell method) of the facial bones, and how is it positioned in relation to the image receptor?

all of the above

Which of the following items would leave an artifact on a facial bone image?

(1) Eyeglasses

(2) Hearing aid

(3) Dentures

perpendicular to image receptor

What is the central ray direction for the parietoacanthial projection (Waters method) of the facial bones?

Parietoacanthial projection (modified Waters method) of the facial bones

Which special projection requires the OML to be positioned 55 degrees from the plane of the image receptor?

SMV of the zygomatic arches

Which of the following projections provides a bilateral view of the zygomatic arches?

lacrimal

which facial bone is located on the anterior and medial wall of the orbit

tangential projection of the zygomatic arch

Which of the following projections is used to provide an image of a single zygomatic arch without superimposition?

nasal bones

What anatomy is best demonstrated when the patient’s head is positioned in a true lateral with the central ray perpendicular to enter ½ inch (1.3 cm) distal to the nasion?

-MSP paraelle to IR

-IP line perpendicular

-IOML parallel to IR

-Cr enters zygoma halfway b/w outer cantos and EAM, collimate

Lateral facial bones info

-OML perpendicular TO IR

-15 degree caudal angle

-CR exits nasion

-collimate

PA axial caldwell info

-OML forms 37 degree angle to IR

-MML is perpendicular to IR

-MSP is perpendicular

-CR exit acanthion

-collimate

parietoacanthial water facial bones

-OML forms a 55-degree angle to the IR

-Cr exits acanthion

-Collimate

Parietoacanthial modified waters facial bones