Digital Radiography

Question 1

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

Answer 1

No

Question 2

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

Answer 2

No

Question 3

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

Answer 3

Digital Image

Question 4

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

Answer 4

Pixel

Question 5

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

Answer 5

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

Question 6

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

Answer 6

Smaller

Question 7

Pixels must be what in order to obtain good resolution?

Answer 7

Small

Question 8

To assign for contrast resolution, there must be what?

Answer 8

A large number of grey shades.

Question 9

What does DICOM stand for?

Answer 9

Digital Imaging Communications in Medicine

Question 10

What is DICOM?

Answer 10

A file format.

Question 11

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

Answer 11

DICOM viewing software

Question 12

Are DICOM files small or large?

Answer 12

Large

Question 13

What does DR stand for?

Answer 13

Digital Radiography

Question 14

What does CR stand for?

Answer 14

Computed Radiography

Question 15

What does DDR stand for?

Answer 15

Direct Digital Radiography

Question 16

Cassettes used in a CR must be processed in what?

How long does it take?

Answer 16

• A plate reader

- 90 sec per plate

Question 17

Does a DDR need a cassette?

Plate reader?

Answer 17

• No

- No

Question 18

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

Answer 18

Available immediately

Question 19

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?

Answer 19

Exposure latitude

Question 20

A small increase in exposure can result in what?

Answer 20

Overexposure

Question 21

A small decrease in exposure can result in what?

Answer 21

Underexposure

Question 22

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

Answer 22

Less

Question 23

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

Answer 23

Film/screen

Question 24

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

Answer 24

Less precise

Question 25

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

Answer 25

True

Question 26

A low exposure image has more what?

Answer 26

"noise"

Question 27

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

Answer 27

0.5 mAs

Question 28

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

Answer 28

More grainy

Question 29

What can happen when a plate becomes overexposed and "saturated"?

Answer 29

Anatomy disappears (image dropout)

Question 30

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

Answer 30

Contrast optimization

Question 31

Contrast optimization does what to the image?

Answer 31

Evens out the entire image.

Question 32

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

Answer 32

Post processing

Question 33

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

Answer 33

About the same

Question 34

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

Answer 34

No

Question 35

What does PACS stand for?

Answer 35

Picture Archive and Communication System

Question 36

What has revolutionized radiographic imaging in veterinary medicine?

Answer 36

Digital radiography