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Veterinary Technician > Radiology > Flashcards

Flashcards in Radiology Deck (188)
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31

For soft tissue what contrast is desirable? For bone tissue?

low contrast(many shades of gray), high contrast

32

The state of chemicals and screen-film combinations can affect the quality of what?

of radiographs and mimic inappropriate exposures

33

The darkroom must be clean, organized, and what else?

completely light proof

34

All chemicals must be kept at the same temperature to prevent what?

reticulation

35

T/F Bacterial, fungal, and algal growth are a common problem in hand-processing tanks and can be controlled by cleaning tanks with 1% chlorine bleach when they are drained.

true

36

T/F The legal requirement for keep radiographs is 7 years; however, it is advisable to keep them until the patient dies.

true

37

T/F Approximately 95% of the exposure recorded on a film is due to the light emitted from the intensifying screens. Only 5% of the exposure of the film results from the ionization of x-rays.

true

38

T/F A cassette must contain close contact between the intensifying screens and the film.

true

39

The primary function of the ____ is to reduce the amount of radiation exposure required to produce a diagnostic radiograph

intensifying screen

40

____ screen speeds require a small exposure and produce less detail; ___ screens require a larger exposure and produce greater detail.

faster, slow

41

T/F Screens don't have to be cleaned regularly because dirt and hair do not get on the screen.

false

42

What can cause artifacts on the screen and lead to a wrong diagnoses?

dirt and hair

43

X-ray film is manufactured with ____ and ____

various speeds and latitude

44

The purpose of a ____ is to reduce the amount of scatter radiation and increase the quality of the radiographic image.

grid

45

What is the most effective way to reduce backscatter?

to limit the size of the x-ray beam to include only the image receptor

46

Exposure to the radiographic film to x-rays makes the film ____

black

47

T/F The higher the tissue density, the higher the radiographic density.

false-lower radiographic density

48

What is the most common cause of poor radiographic contrast?

inappropriate exposure factors (kVp, mAs, exposure time)

49

There are 5 radiographic densities with the exception of ____.

air

50

How does air appear on a radiograph? Where is it?

black, commonly seen in lungs and as gas in the intestines

51

How does fat appear on a radiograph? Where?

white, usually found in the abdomen and under the skin

52

How does soft tissue appear on an radiograph? Where?

white, consists of internal organs like the liver, kidney, and intestines

53

How does bone appear on a radiograph?

whiter

54

How does metal appear on a radiograph?

vivid white, an example is lead

55

One of the densities called ____ can be difficult to visualize if not surrounded by fat.

soft tissue

56

What tissues are most sensitive to radiation induced damage?

all living cells, rapidly dividing cells (bone marrow), reproductive organs (no pregnant women)

57

How old do you have to be to be involved in radiographic procedures?

18 or over

58

Other tissues that are readily sensitive to radiation are?

bone, lymphatic, dermis, leukopoietic, hemopoietic, and epithelial tissues

59

What are 3 primary method by which personnel are exposed to radiation during radiography?

primary beam, secondary (scatter) radiation caused by interaction of the primary beam with objects in its path, and leakage radiation from x-ray tube housing

60

Damage to the body induced by radiation that becomes manifest within the lifetime of the recipient is?

somatic damage