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Review Class Finals > Digital Imaging > Flashcards

Digital Imaging Flashcards

1
Q

The system used to view and store digital x-ray images is called a _____ system

A

PACS

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2
Q

Fog affects radiographic quality by causing

A

Decreased Contrast

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3
Q

A low kVp setting produces an image with

A

A short scale of contrast

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4
Q

The universally accepted standard for exchanging radiographic images inside and outside the institution, among all manufacturers, is which?

A

DICOM

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5
Q

What is the name of the computer software functions hat allows separate radiographic images to be tied into one image for viewing?

A

Image stitching

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6
Q

Which of the following would be considered involuntary motion by the patient?
1)tremor
2)peristalsis
3)breathing

A

1 & 2

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7
Q

Which of the following must be used with digital based x-ray procedures to ensure ALARA concept is practiced?

A

An exposure technique chart

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8
Q

Shape distortion is the result of:

A

Unequal magnification of the actual shape of the structure

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9
Q

This occurs when there may be a defect in a component of the computer screen matrix that may cause a loss of patient information

A

Dead pixels

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10
Q

One of the main advantages of using CR and DR digital systems is:

A

Ability to process images very fast

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11
Q

The difference in density between any two adjacent portions of the image is called

A

Radiographic contrast

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12
Q

Quantum mottle occurs in digital images if

A

There are not enough photons reaching the IR

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13
Q

The term used in the new digital environment to replace density is

A

Brightness

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14
Q

Which of the following artifacts can occur if the CR imaging plate receives too much background scatter radiation?

A

Fogging

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15
Q

Which of the following is important to use when using digital systems for mobile radiography?

A

Grid

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16
Q

Which of the following are the prime factors of exposures in radiography?

A

Ma, exposure time, kilovoltage, SID

17
Q

If an image is made using 500 mA, 0.1 second, and 75 kVp, What would the mAs be for this exposure?

A

50 mAs

18
Q

The geometric factors that affect the formation of the image are:
1) SID
2) OID
3) Focial spot

A

1,2,&3

19
Q

A matrix of 1200 x 1800 will show how many pixels on the viewing monitor?

A

2,160,000

20
Q

Another name for size distortion is

A

Magnification

21
Q

When it is necessary to differentiate tissues with similar tissue densities, which of the following image quality factors is most desireable?

A

High contrast

22
Q

An increase in OID will result in

A

Increased magnification

23
Q

When an image demonstrates only a few densities, and there is a great difference between the densities, the image is described having

A

Short scale contrast

24
Q

What is the term for the calibration of an image display system that ensures that all radiographic images gray scales are presented consistently?

A

DICOM grayscale function

25
Q

The primary controller of radiographic density is

A

MAs

26
Q

A CCD (charged coupled device) is used in an indirection conversion DR system to

A

Convert light into an electrical signal

27
Q

If a radiographer produced an image using an x-ray exposure that is below the dynamic range, the resulting image is expected to display?

A

Quantum mottle

28
Q

The spatial resolution of a radiography system is expressed in units of

A

Line pairs per millimeter

29
Q

When SID is increased, which change must be made to maintain IR exposure?

A

Increase mAs

30
Q

The ability to produce quality radiographs using a wide range of technical factors is called

A

Exposure latitude

31
Q

The response of the detector to different levels of radiation exposure is termed

A

Dynamic range

32
Q

The ability of a digital system to convert the x-ray input electrical signal into a useful radiographic image is termed the

A

Signal to noise ratio

33
Q

Which of the following takes the stored charge in the flat-panel detector and converts it into a digital value

A

analog to digital converter (ADC)

34
Q

Which of the following will be seen in the x-ray image if either the kVp or mA is set too low for the projection?

A

Quantum mottle

Review Class Finals (9 decks)

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