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Digital Imaging > Week 1 > Flashcards

Week 1 Flashcards

1
Q

What are the three types of x-ray?

A

Conventional, CR (Computed Radiography), DR (Digital Radiography)

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2
Q

Radiography that uses intensifying screens and film

A

Conventional Film/Screen Radiography

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3
Q

Another name for Computed Radiography that is used more often

A

Photostimulable Phosphor (PSP)

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4
Q

Digital acquisition modality that uses storage phosphor plates to produce projection images

A

PSP (CR)

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5
Q

Where are film intensifying screens primarily used?

A

Conventional Radiology

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6
Q

Acquires image through use of photostimulable phosphor plate storage

A

CR - Computed Radiography

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7
Q

What generally stays the same when comparing computed and conventional radiograhy?

A

Efficiency levels

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8
Q

What is the active element in a phosphor plate?

A

Barium Fluorohalide

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9
Q

In reference to a psp image capture to release the latent image a ___ ____ ____must be scanned over

A

Focus Laser Light

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10
Q

Indirect capture is very similar to PSP systems in that the X-ray energy stimulates a ____which gives off light that is detected and turned into an electrical signal

A

Scintillator

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11
Q

Converts x-ray energy directly to a digital electrical signal?

A

photoconductor

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12
Q

Exposure latitude in conventional is equivalent to what in DR?

A

Dynamic range

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13
Q

What is a look-up table ?

A

Maps the image gray scale values

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14
Q

What are the components of PACS?

A

Reading stations, physician review stations, web access, technologist quality control, administrative stations, many interfaces to various hospital and radiology systems.

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15
Q

What type of imaging would require all new equipment?

A

Digital Radiography

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16
Q

T/F - Indirect capture converts absorbed energy into visible light.

A

True

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17
Q

T/F - Changing matrix and FOV will not change the pixel size.

A

False

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18
Q

What is each square in a matrix called?

A

picture element

19
Q

Term for Number of bits per pixel

A

Bit Depth

20
Q

What does exposure index refer to?

A

Amount of exposure received by the image receptor (not the patient)

21
Q

The difference between the actual exposure (Kind) and the Target (Ktgt) exposure

A

Deviation Index

22
Q

Ability of the digital system to display subtle changes in the shade of gray

A

contrast resolution

23
Q

Ability of the imaging system to demonstrate small details of an object

A

spatial resolution

24
Q

How efficiently a system converts x-ray input signal into useful output image

A

Detective quantum efficiency (DQE)

25
Q

T/F -Reflection of ambient light can be problematic

A

true

26
Q

Failure of the system to find the collimated edges can result in…

A

incorrect data collection, and images may be too bright or too dark

27
Q

Histogram displays the useful image by locating….

A

minimum and maximum signal within the anatomic regions of interest

28
Q

The higher the kvp, the more ___ the histogram, the lower the kvp, the more ___ the histogram

A

narrow, wider

29
Q

Result when not enough pixels in image.

A

Low resolution

30
Q

When exposure is greater or less than what is needed to produce an image, this occurs in an effort to display the pixels for the area of interest

A

Automatic Rescaling

31
Q

Images are produced regardless of this amount

A

contrast and density

32
Q

If you change the slope of a look up table this decreases/increases what?

A

contrast

33
Q

An improper algorithm application may cause image to

A

enhance contrast

34
Q

Term for Amplifications of frequencies

A

Edge Enhancement

35
Q

Suppressing frequencies that can result in the loss of detail

A

masking

36
Q

Low-pass filtering is best used for what type of anatomy images?

A

Bones

37
Q

High-pass filtering is best used for what type of anatomy images?

A

organs and tissues

38
Q

What do image level parameters control on a image?

A

brightness

39
Q

What controls the ratio of black and white, or contrast, on a image?

A

window width

40
Q

When unexposed borders around the collimation edges allow excess light to enter the eye.

A

veil glare

41
Q

Image manipulation used to blacken out the white collimated borders, effectively eliminating veil glare

A

Automatic Shuttering

42
Q

Used when anatomy or the area of interest it too large to fit on one cassette, multiple areas can be “stitched” together using specialized software programs

A

Image Stitching

43
Q

What is the shape of a histogram specific to?

A

anatomy

Digital Imaging (5 decks)

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