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Radiology > Module 22 > Flashcards

Module 22 Flashcards

1
Q

What extra-oral film is most commonly prescribed?

A

Panoramic

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2
Q

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

A

supplement

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3
Q

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

A

impacted
growth/eruption
trauma
diseases/lesions

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4
Q

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

A

defined

sharp

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5
Q

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

A

No

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6
Q

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

A

receptor

tubehead

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7
Q

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

A

False

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8
Q

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

A

tomography

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9
Q

The rotation center is what?

A

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

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10
Q

What are the 3 rotation centers

A

doubel-center
tripple-center
Moving-center

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11
Q

_______ influence the size and shape of the focal trough?

A

rotational centers

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12
Q

The focal trough is also known as?

A

image layer

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13
Q

Define the focal trough?

A

3 dimensional curved zone where structures are clearly demonstrated

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14
Q

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

A

closer

narrower

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15
Q

Quality of a Panoramic x-ray depends on?

A

position of pt.s teeth within focal trough

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16
Q

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

A

Unit
Receptor
Film
Cassette with intensifying screen

17
Q

The main components of a panoramic unit are?

A

tubehead
head positioner
exposure controls

18
Q

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

A

lead
narrow vertical slit
2x30mm wide

19
Q

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

A

False- opposite

20
Q

Intensifying screens convert x-rays into?

A

light

21
Q

What size films are used in Panoramic imaging?

A

5x12

6x12

22
Q

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

A

Calcium tungstate
Rare earth
Rare earth

23
Q

Which intensifying screen is sensitive to green light?

A

Rare Earth

24
Q

The patients midsagital plane should be _____ to the floor?

A

perpendicular

25
Q

The Frankfort plane should be _____ to the floor?

A

parallel

26
Q

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

A

False

27
Q

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

A

dark radiolucent shadow obscures anterior teeth

28
Q

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

A

MX incisors are blurred

Reverse smile line :(

29
Q

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

A

MN incisors are blurred

exaggerated smile line :)

30
Q

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

A

too far forward on bite block

31
Q

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

A

teeth appear “fat” and out of focus

32
Q

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

A

spine superimposes over anterior teeth

33
Q

Advantages of Panoramic x-rays?

A

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

34
Q

Disadvantages of Panoramic x-rays?

A

Quality
Focal trough limitations
distortion
Cost of equipment

35
Q

The term focal trough is a _____ concept?

A

theoretical

36
Q

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

A

Manufacturer

37
Q

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

A

False

38
Q

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

A

Radiolucent shadow over apices of MX

39
Q

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

A

Last name, first name, date, clinic number

Radiology (24 decks)

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