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Flashcards in Review Chart 2 Deck (85)
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61

What is the purpose of the collimator shutters?

Filter the periphery of the beam

62

Which 3 radiographic projections routinely use compensating filtration?

AP thoracic, lateral thoracic, and full spine

63

What is the best way to identify a patient's film?

A flash on label before presenting

64

When is a fetus most sensitive to radiation?

1st trimester

65

What body parts are the most susceptible to develop a malignancy from ionizing radiation?

Bone marrow and breast

66

When comparing films of the same patient, one set taken 3 months ago, you notice the film is too dark and the cervicals are larger than they were 3 months ago. What went wrong?

You took the film at 40" instead of 72" that you used 3 months ago

67

What is the best type of x-ray equipment to buy?

Dual focus tube with a tungsten target surrounded by copper with the same anode angle of 14 degrees and tungsten filaments

68

If you wanted to reduce penumbra, what should you consider doing?

Use a smaller effective focal spot

69

What is the most effective way to reduce secondary radiation?

Collimation

70

A decrease in the anode angle would have what effect?

Smaller effective focal spot

71

What is the anode heel effect?

A reduced intensity of the x-ray beam on the anode side of the tube

72

Inherent filtration adds how much aluminum equivalency?

.5mm

73

The first radiographic print was of what body part?

Hand

74

What sets the current going through a filament?

mA control

75

What occurs to cause ionization?

Removal of an electron from an atom

76

A step up transformer will have which effect?

Increase the volts

77

On the average, what accounts for over 50% of the typical person's radiation exposure?

Radon

78

What device is used to detect and measure radiation?

Dosimeter

79

What is the most helpful in producing a good quality AP full spine x-ray?

Have the anode toward the cervical

80

What is the minimum anode angle that can be used if you were going to take a 14.36" full spine film?

14 degrees

81

Which type of radiation always travels at the speed of light?

Electromagnetic (has no mass and travels in packs "photons/quanta")

82

X-ray is produced at which tube part?

Target

83

How many electrodes does the usual x-ray tube contain?

2 (anode+ and cathode-)

84

Of your body's systems, which will require the most radiation in an acute blast to screw it up?

Nervous system

85

Radon gas accounts for what percentage of the annual dose of natural background radiation?

55%