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small animal medicine > radiology > Flashcards

radiology Flashcards

1
Q

reduction of the exposure time will increase the motion unsharpness?

A

False

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2
Q

what is the role of a collimator?

A

setting the size of the x-ray beam

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3
Q

KW is an exposure factor, true of false?

A

False

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4
Q

to maintain the same exposure, if increasing the MAs you have to elevate the KVp too?

A

False

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5
Q

What is the normal tube voltage range in small animal radiography?

A

40-100 KVp

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6
Q

the use of a grid improves the image contrast?

A

True

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7
Q

what is not a normal component of an indirect digital system (CR)?

A

X-ray film

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8
Q

the elementary unit of the X-ray beam is the electron?

A

FALSE

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9
Q

Fluroscopy can be digital or analog, true or false?

A

True

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10
Q

Fluroscopy is also called “C-arm”

A

true

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11
Q

electromagnetic radiation with higher frequency has more penetrating power through space and matter?

A

True

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12
Q

What is the direction of travel of electrons in the X-ray tube?

A

from the cathode to the anode

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13
Q

how do we increase the penetrating power of X-rays?

A

increase the KVp

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14
Q

increasing the film-object distance will what?

A

distort the image

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15
Q

1% of the energy produced by the anode is in the form of What?

A

X-rays

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16
Q

the temperature of the filament within the cathode is controlled by what?

A

time setting

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17
Q

The intensity of X-rays increases as SID (source-image-distance) decreases?

A

True

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18
Q

How is the potential difference measured between the anode and the cathode?

A

kilovolts

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19
Q

thinner body parts do what to the radiographic density?

A

increase it

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20
Q

what is the main factor controling the scatter radiation?

A

the collimator setting

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21
Q

what do grids contain?

A

Lead

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22
Q

where is a grid located?

A

Between the patient and cassette

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23
Q

to prevent magnification and distortion of the object being radiographed, the patient must be??

A

As parallel and close to the film as possible

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24
Q

how should the animal be positioned when radiograph is taken over laterally positioned animal?

A

head should face the viewers left with its spine at the top of the image

25
Q

any body part exceeding this measurement requires the use of a grid?

A

10cm

26
Q

when using a grid the dose of radiation should be reduced?

A

true

27
Q

the scattered beam is negligible concerning safety of staff?

A

False

28
Q

the X-ray penetrates the body without losing energy?

A

False

29
Q

what is the purpose of a grid?

A

to improve the image contrast

30
Q

the X-ray consists of charged particles?

A

False

31
Q

what is not a normal component of the digital radiographic technology:

X-ray tube

Intensifying screen

Grid

Collimator

A

Intensifying screen

32
Q

the attenuation of the x-ray beam does not rely on which parameter?

A

the optical density

33
Q

what component is different between conventional and digital radiography ?

A

detector

34
Q

what is the main source of exposure of the personnel?

A

secondary beam from the patient

35
Q

Fat is more radiopaque than fluids?

A

False

36
Q

increased distance between the the object and detector can cause an unsharp image?

A

False

37
Q

Distortion can be prevented by centralisation?

A

true

38
Q

CR systems are cheaper, DR systems are more expensive?

A

True

39
Q

what exposure factor can be used in small animal radiography?

A

5-11mAs

40
Q

scatter radiation is mainly bases on mAs?

A

False

41
Q

longer exposure time is needed for a chest X-ray?

A

False

42
Q

what exposure factors cause the same blackening on the detector as 60KV/8mAs?

A

80Kv/ 2mAs

43
Q

magnification is an image parameter?

A

False

44
Q

An under exposed image will be too bright?

A

True

45
Q

an under exposed image will be too bright?

A

True

46
Q

Digital systems require much higher doses than anolog?

A

False

47
Q

dose equivaent is a protection against ionising radiation?

A

False

48
Q

what does the personal dose meter record?

A

the effective dose

49
Q

Sochastic effects may result from diagnostic radiology?

A

true

50
Q

what is an especially sensitive tissue for the ionising radiation?

A

Bone marrow

51
Q

deterministic effects are proportionate to what ?

A

severity is proportionate to the dose

52
Q

Radon is produced by what?

A

the x-ray

53
Q

the X-ray photons in the body are not normally …..?

A

transmitted

54
Q

why can a structure be more radiopaque than others?

A

it consists of elements of higher atomic number and has the same diameter

55
Q

what if the object is not in the centre of the detector plate?

A

the resulting image will be unsharp

56
Q

what does aqusition mean in digital imaging?

A

the creation of a picture from the electric sign

57
Q

DICOM files are preferred by the owners?

A

true

58
Q
A

small animal medicine (1 decks)

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