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Flashcards in Review Chart 2 Deck (85)
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31

How much inherent filtration can you expect your tube housing and its contents to have?

.5mm

32

From which of the following does the electron cloud form?

The filament

33

At a set FFD and film size, the less collimation used the ________ the film will be?

Darker

34

The shutters of a collimator are made of which material?

Aluminum

35

The electron cloud is formed by which process?

Thermionic emission

36

If you are x-raying a 400 pound man's lumbar spine, how do you save your machine?

Using a decreased anode angle

37

You have taken an AP lumbo-pelvic film and notice a 2 inch white or very light band extending across the top of the radiograph. The bottom and lateral margins of it are properly exposed. The ischial tuberosities are within 1 inch of the bottom of the film. With this info, what went wrong?

Central ray is too low

38

Why do we want to filter out as many of the soft rays as possible?

They cause more scatter to reach the film

39

You've taken an AP thoracic radiograph and notice that the upper part of the spine is overexposed. What should you have done to get a better film?

Used a filter for the upper part of the film

40

Besides indicating anatomy of the patient, what is the advantage of the "Mitchell" marker?

It indicates recumbent or upright position

41

On a film, you see a wide light vertical band on one side of the film and the patient's spine is off center toward the left. You say that the patient was properly centered to the grid cabinet. What went wrong?

The film wasn't pushed in all the way

42

If you can't afford digital imaging, what should you get?

High frequency

43

Radon comes to us in which form?

Alpha particles

44

Give or take a little, natural background radiation accounts for about how much of our average annual exposure to ionizing radiation?

80%

45

What is the term for the beneficial effect of radiation?

Radiation hormesis

46

What is NOT a property of x-ray?

They are stored in matter (NOT TRUE)

47

How many rads are in a gray?

100

48

Which unit of measurement is usually used for reporting occupational exposure to radiation?

Rem

49

What year did BJ Palmer introduce x-ray into the chiropractic profession?

1910

50

The focal spot size is usually set in conjunction with which of the following?

Low voltage circuit

51

What would happen if you lengthen the time of an exposure?

You would increase the number of photons hitting the patient

52

Which primary factor is responsible for the quality of an x-ray beam?

kVp

53

The mA setting determines what?

Current going through the filament

54

What would have the least fluctuation in the kV level?

High frequency

55

What propels the electrons in an x-ray tube?

kV

56

A tube warm-up procedure should be performed by using how many exposures?

2

57

Which part of an x-ray tube is the target located in?

Anode (target, stem, roter)

58

The first place that attenuation of any part of the x-ray beam occurs is at which point?

Anode

59

The term "thermionic emission" is most closely related to what?

The cloud of electrons at the filament

60

How many filaments does a dual focus tube have?

2