Module 22

Question 1

What extra-oral film is most commonly prescribed?

Answer 1

Panoramic

Question 2

A panoramic x-ray is used to _______ other x-rays?

Answer 2

supplement

Question 3

Panoramic x-rays are great for examining _____ teeth, ____ patterns, MX/MN ______ and detect __ and __ or the jaws?

Answer 3

impacted
growth/eruption
trauma
diseases/lesions

Question 4

Panoramic x-rays are not as _____ or ____ as PA’s/BWX?

Answer 4

defined

sharp

Question 5

Should Panoramic x-rays be used to evaluate caries, perio, or periapical lesions?

Answer 5

No

Question 6

In panoramic imaging the _ and ___ move around the patient?

Answer 6

receptor

tubehead

Question 7

The x-ray tube rotates the same direction as the receptor? T/F

Answer 7

False

Question 8

The movement of the tube head and receptor produces an image through what process?

Answer 8

tomography

Question 9

The rotation center is what?

Answer 9

pivotal point/axis, around which the receptor and tubehead rotate

Question 10

What are the 3 rotation centers

Answer 10

doubel-center
tripple-center
Moving-center

Question 11

_______ influence the size and shape of the focal trough?

Answer 11

rotational centers

Question 12

The focal trough is also known as?

Answer 12

image layer

Question 13

Define the focal trough?

Answer 13

3 dimensional curved zone where structures are clearly demonstrated

Question 14

The _____ the rotation center to teeth, the _ the focal trough?

Answer 14

closer

narrower

Question 15

Quality of a Panoramic x-ray depends on?

Answer 15

position of pt.s teeth within focal trough

Question 16

What equipment is used to take a panoramic x-ray?

Answer 16

Unit
Receptor
Film
Cassette with intensifying screen

Question 17

The main components of a panoramic unit are?

Answer 17

tubehead
head positioner
exposure controls

Question 18

The collimator used in the panoramic x-ray machine is a ___ plate with an opening in the shape of a _____ with _____size opening?

Answer 18

lead
narrow vertical slit
2x30mm wide

Question 19

The tube head rotates in front of the patients head, the receptor rotates in back of the patient T/F?

Answer 19

False- opposite

Question 20

Intensifying screens convert x-rays into?

Answer 20

light

Question 21

What size films are used in Panoramic imaging?

Answer 21

5x12

6x12

Question 22

What are the 2 types of intensifying screens? Which one is used most?

Answer 22

Calcium tungstate
Rare earth
Rare earth

Question 23

Which intensifying screen is sensitive to green light?

Answer 23

Rare Earth

Question 24

The patients midsagital plane should be _____ to the floor?

Answer 24

perpendicular

Question 25

The Frankfort plane should be _____ to the floor?

Answer 25

parallel

Question 26

T/F You should always use a lead apron with a thyroid collar when taking Pano films?

Answer 26

False

Question 27

If the patients lips are not closed what happens to the pano film?

Answer 27

dark radiolucent shadow obscures anterior teeth

Question 28

If the chin is tilted up too far what happens to the image?

Answer 28

MX incisors are blurred | Reverse smile line :(

Question 29

If the chin is tilted down too far what happens to the image?

Answer 29

MN incisors are blurred | exaggerated smile line :)

Question 30

What is wrong with PT positioning if the anterior teeth look "skinny"?

Answer 30

too far forward on bite block

Question 31

If the patient's teeth are aligned too far back on the bite-block what happens to the image?

Answer 31

teeth appear "fat" and out of focus

Question 32

What happens if the patient isn't standing up tall?

Answer 32

spine superimposes over anterior teeth

Question 33

Advantages of Panoramic x-rays?

Answer 33

Field Size Simplicity Less exposure to x-rays pt. cooperation is high

Question 34

Disadvantages of Panoramic x-rays?

Answer 34

Quality Focal trough limitations distortion Cost of equipment

Question 35

The term focal trough is a _____ concept?

Answer 35

theoretical

Question 36

The size and shape of the focal trough is determined by?

Answer 36

Manufacturer

Question 37

T/F You get more exposure to x-rays when doing a pano than with 4BWX?

Answer 37

False

Question 38

What happens if the patient doesn't keep their tongue up to the roof of the mouth?

Answer 38

Radiolucent shadow over apices of MX

Question 39

What information do you put on the label for a panoramic x-ray?

Answer 39

Last name, first name, date, clinic number