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Diagnostic Imaging > Digital Radiography > Flashcards

Digital Radiography Flashcards

1
Q

Is photographing radiographs with an iPhone an example of digital radiography?

A

No

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2
Q

Is running radiographs through a digitizer an example of digital radiography?

A

No

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3
Q

A map of x-ray transmission converted to a digital matrix is known as what?

A

Digital Image

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4
Q

What is the term for each row and column intersection in a digital image?

A

Pixel

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5
Q

T/F: The more pixels/area the lesser the detail.

A

False - The more pixels/area the greater the detail.

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6
Q

Do pixels need to be smaller or larger than the lesion in order to be seen on the digital radiograph?

A

Smaller

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7
Q

Pixels must be what in order to obtain good resolution?

A

Small

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8
Q

To assign for contrast resolution, there must be what?

A

A large number of grey shades.

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9
Q

What does DICOM stand for?

A

Digital Imaging Communications in Medicine

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10
Q

What is DICOM?

A

A file format.

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11
Q

What do you need in order to view digital imaging files?

A

DICOM viewing software

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12
Q

Are DICOM files small or large?

A

Large

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13
Q

What does DR stand for?

A

Digital Radiography

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14
Q

What does CR stand for?

A

Computed Radiography

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15
Q

What does DDR stand for?

A

Direct Digital Radiography

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16
Q

Cassettes used in a CR must be processed in what?

How long does it take?

A
  • A plate reader

- 90 sec per plate

17
Q

Does a DDR need a cassette?

Plate reader?

A
  • No

- No

18
Q

How long does it take for the image to be available with a DDR?

A

Available immediately

19
Q

The extent to which a film, image plate or flat panel can be over or underexposed and still achieve an acceptable result is known as what?

A

Exposure latitude

20
Q

A small increase in exposure can result in what?

A

Overexposure

21
Q

A small decrease in exposure can result in what?

A

Underexposure

22
Q

With digital systems, the relationship between exposure and blackness is more or less steep compared to conventional film?

A

Less

23
Q

Which has a narrower margin of error: film/screen or digital?

A

Film/screen

24
Q

Do you have to be more or less precise with digital?

A

Less precise

25
Q

T/F: Exposure latitude does not mean that exposure factors are not important.

A

True

26
Q

A low exposure image has more what?

A

“noise”

27
Q

Which has a lower exposure: 0.5 mAs or 4 mAs?

A

0.5 mAs

28
Q

If an image is underexposed, is it more or less grainy?

A

More grainy

29
Q

What can happen when a plate becomes overexposed and “saturated”?

A

Anatomy disappears (image dropout)

30
Q

The range of light intensities a medium can capture is known as what?

A

Contrast optimization

31
Q

Contrast optimization does what to the image?

A

Evens out the entire image.

32
Q

What is the ability to change the image contrast and blackness after acquisition is known as what?

A

Post processing

33
Q

Are exposure factors lower, about the same or higher than with digital radiography compared to film-screen systems?

A

About the same

34
Q

Will artifacts and other technical problems be less with digital radiography?

A

No

35
Q

What does PACS stand for?

A

Picture Archive and Communication System

36
Q

What has revolutionized radiographic imaging in veterinary medicine?

A

Digital radiography

Diagnostic Imaging (3 decks)

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