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Radiology Artifacts. Screen-Film Mammography

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Presentation on theme: "Radiology Artifacts. Screen-Film Mammography"— Presentation transcript:

1 Radiology Artifacts

2 Screen-Film Mammography

3 Pressure mark or crimp mark due to excessive pressure on film appears as increased optical density.

4 Screen-Film Mammography

5 Artifacts caused by dust and dirt on intensifying screen creating white spots simulating calcifications

6 Screen-Film Mammography

7 Blurring due to motion Screen-Film Mammography

8

9 Fingerprints

10

11 Long streak of stain on intensifying screen appearing as minus density

12 Screen-Film Mammography Obvious underexposure but not caused by technique or processing

13 Screen-Film Mammography Two films loaded into same cassette

14 Screen-Film Mammography

15 Wet or damp screen causing plus density

16 Screen-Film Mammography Easy one. Why is ID superimposed on breast?

17 Screen-Film Mammography Cassette loaded backwards (front- back) into bucky tray.

18 Screen-Film Mammography Obvious underexposure but not caused by technique or processing

19 Screen-Film Mammography Film loaded upside down into cassette

20 Screen-Film Mammography Easy?

21 Cassette loaded upside down into bucky tray.

22 Screen-Film Mammography

23 Light leak in cassette Incompletely latched Incompletely latched crack crack

24 Screen-Film Mammography

25 Double exposure

26 Screen-Film Mammography

27 Compression paddle vertical section (anterior lip)

28 Screen-Film Mammography

29 Films run through processor too close together (overlapped)

30 Screen-Film Mammography

31 Static electricity

32 Screen-Film Mammography

33 Emulsion pick-off caused by pulling stuck films apart

34 Screen-Film Mammography

35 Black arrows point at vertical black lines perpendicular to direction of film travel through processor. Cause: pressure from developer roller or moisture on entrance roller.

36 Screen-Film Mammography

37 Dust in darkroom and dirty rollers causing emulsion pick-off.

38 Screen-Film Mammography

39 Over-development caused by chemical fog.

40 Radiography &hits=10&RESULTFORMAT=&fulltext=grid+artifacts&andorexactfulltext=an d&searchid=1&FIRSTINDEX=0&sortspec=relevance&resourcetype=HWCIT Two images of same anatomy. What changed?

41 Radiography No grid 102 cm SID.33R ESE Grid 122 cm SID 2.2 R ESE

42 CR HITS=10&hits=10&RESULTFORMAT=&fulltext=artifact&searchid=1 &FIRSTINDEX=10&sortspec=relevance&resourcetype=HWCIT What are white spots?

43 CR Dust / dirt on phosphor screen

44 CR HITS=10&hits=10&RESULTFORMAT=&fulltext=artifact&searchid=1 &FIRSTINDEX=10&sortspec=relevance&resourcetype=HWCIT Dirt on CR plate. Right image repeated on screen-film

45

46 CR HITS=10&hits=10&RESULTFORMAT=&fulltext=artifact&searchid=1 &FIRSTINDEX=10&sortspec=relevance&resourcetype=HWCIT What are white lines?

47 CR Cracks on image plate due to mechanical wear

48 CR HITS=10&hits=10&RESULTFORMAT=&fulltext=artifact&searchid=1 &FIRSTINDEX=10&sortspec=relevance&resourcetype=HWCIT

49 CR Transport problems in CR reader

50 CR HITS=10&hits=10&RESULTFORMAT=&fulltext=artifact&searchid=1 &FIRSTINDEX=10&sortspec=relevance&resourcetype=HWCIT What are funny dark patterns on ventilator tube metal stabilizer?

51 CR Moire effect because of interference between scan frequency of matrix and spiral

52 CR HITS=10&hits=10&RESULTFORMAT=&fulltext=artifact&searchid=1 &FIRSTINDEX=10&sortspec=relevance&resourcetype=HWCIT

53 CR Diagonal collimation caused algorithm to improperly recognize collimated area

54 CR HITS=10&hits=10&RESULTFORMAT=&fulltext=artifact&searchid=1 &FIRSTINDEX=10&sortspec=relevance&resourcetype=HWCIT

55 CR Chest incorrectly specified by technologist to CR reader as lumbar spine

56 Ultrasound hits=10&RESULTFORMAT=&fulltext=artifacts&andorexactfulltext=and&search id=1&FIRSTINDEX=0&sortspec=relevance&resourcetype=HWCIT There’s flow but it isn’t showing up. Why?

57 Ultrasound hits=10&RESULTFORMAT=&fulltext=artifacts&andorexactfulltext=and&search id=1&FIRSTINDEX=0&sortspec=relevance&resourcetype=HWCIT Improper setting of velocity scale (set too high). Low flow not displayed

58 Ultrasound hits=10&RESULTFORMAT=&fulltext=artifacts&andorexactfulltext=and&search id=1&FIRSTINDEX=0&sortspec=relevance&resourcetype=HWCIT What’s that funny reversed flow?

59 Ultrasound Improper setting of velocity scale (set too low). Aliasing occurs

60 Ultrasound hits=10&RESULTFORMAT=&fulltext=artifacts&andorexactfulltext=and&search id=1&FIRSTINDEX=0&sortspec=relevance&resourcetype=HWCIT Low flow in both directions?

61 Ultrasound Doppler angle is 90 o ; sample volume has vessel perpendicular to beam. Right image alters Doppler angle.

62 Ultrasound hits=10&RESULTFORMAT=&fulltext=artifacts&andorexactfulltext=and&search id=1&FIRSTINDEX=0&sortspec=relevance&resourcetype=HWCIT Same anatomy. Why is there spectral broadening on the left image?

63 Ultrasound 71 o Doppler angle 81 o Doppler angle Minimize spectral broadening artifact by using Doppler angles < 60 o


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