Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

RTCA253 Exposures > Image Artifacts > Flashcards

Image Artifacts Flashcards

1
Q

Any undesirable OD on an image that does not properly show the anatomy being examined

A

Image artifacts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What do look at when determining the causes?

A

patient, processing, exposure, handling & storage

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Benefits of early detection

A
  • Lowered operating costs

- Minimize patient exposure to radiation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What do you check before and after PM?

A

Cleaning of the racks and inspection of components and assemblies

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Processor artifacts

A

Emulsion pickoff, chemical fog, guide-shoe marks, guide shoe and roller scratches, wet pressure sensitization (water marks), chemical spots (dichroic stain/hyporetention)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Occur at 3.1416 inch intervals, because of dirt or a chemical stain on roller

A

Pi Lines

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Pi lines are caused because

A

the rollers are 1 inch in diameter, 3.1416 represents one revolution of a roller, and artifact appears perpendicular to the film’s direction of travel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Causes emulision pick- off and gelatin buildup resulting sludge deposits on the film

A

dirty rollers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

seen at leading or trailing edge of film caused by improper positioning

A

Guide shoe marks

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Over development of film resulting in excessive values on sensitometry films and OD on radiographic films

A

Chemical fog

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Chemical fog caused by

A

developer temp, time, and pH too high

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Wet- pressure sensitization AKA

A

Entrance roller marks

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Entrance rollers become wet before film is introduced, combination of pressure & water marks forms a series of dark stripes that match the grooves on rollers

A

Wet- pressure sensitization

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Where are wet pressure sensitzation produced?

A

developer tank

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

For Wet- pressure sensitization irregular or dirty rollers produces:

A

small circular patterns of increased OD

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Dichroic stain AKA

A

Curtain effect

17
Q

2 colors of Dichroic stains and what caused them

A

Brownish color- caused by oxidized developer

Greenish-yellow caused by incomplete fixation

18
Q

caused by incomplete washing

A

hyporetention

19
Q

plus-density

A

darker than the background

20
Q

Minus-density

A

lighter than the background

21
Q

Plus density caused by application of physical pressure on the film :

A

after it was was exposed

22
Q

Minus density caused by application of physical pressure on the film

A

before it was was exposed

23
Q

Plus density caused by:

A
  • poor film handling
  • poor loading techniques
  • dropping or bending of film before feeding it into the processing
24
Q

Plus density caused during the

A

developer stage

25
Q

Minus density caused by:

A
  • poor film handling
  • poor loading techniques
  • by dirt or dust in the cassette
26
Q

Minus density occurs before:

A

the fixing or washing stage

27
Q

Exposure artifacts

A

Motion, heat blur, double exposure, improper patient position, poor film to screen contact, grid lines, grid cutoff, moire effect (zerbra pattern)

28
Q

Moire effect

A

double set of grid lines, more in MRI

29
Q

handling and storage artifacts

A

Light fog, radiation fog, static, kink marks, scratches, dirty cassettes

30
Q

Safelight/ radiation fog caused by

A
  • Temperature or humidity too high
  • filter bin not properly shielded from radiation
  • Safelight too bright
  • film left in room during addtional exposures
31
Q

-Streaks of increased OD

A
  • the darkroom or cassette has white-light leaks
  • Light of any improper color that strikes the film before development fogs the film
  • lowers image contrast
32
Q

Kink marks

A
  • Improper handling of film

- Stacking film too high (not positioned on end)

33
Q

what are the 3 kinds of static artifacts?

A

crown, tree, smudge marks

34
Q

Static caused by

A

temperature or humidity too low

RTCA253 Exposures (6 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions