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Artifact analysis One of the causes of rejected images listed in the repeat analysis worksheet is the presence of image artifacts. An artifact can contribute.

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Presentation on theme: "Artifact analysis One of the causes of rejected images listed in the repeat analysis worksheet is the presence of image artifacts. An artifact can contribute."— Presentation transcript:

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2 Artifact analysis One of the causes of rejected images listed in the repeat analysis worksheet is the presence of image artifacts. An artifact can contribute significantly to the total repeat rate; therefore a thorough knowledge of artifacts and their possible causes is necessary so that corrective action can be taken.

3 What Is An Artifact? Any optical density that is not anatomy An unwanted density on the radiograph Interferes with diagnosis

4 There Are Three Time Periods In Which Artifacts Can Occur During exposure During processing During film handling, prior to processing, loading cassette, or storing

5 Exposure Artifacts They are caused by the patient, the technologist, or the equipment during a diagnostic procedure Poor screen-film contact Improper use/positioning of a grid Double exposure Patient motion Poor patient preparation Clothing, jewelery, glasses, belts, etc.

6 Processing Artifacts They are caused by or occur during the processing of diagnostic images Dirty Rollers Will leave deposits on film Areas of increased or reduced density Occasionally some sludge may not be washed off and dried onto the film Chemical Fog Improper or inadequate chemistry Leaves a uniform dull gray haze on the film May also be seen in two different colors Referred to as dichroic stain

7 Guide Shoe and Roller Marks Guide shoes are sprung or improperly positioned The ridges in the guide shoe press against the film leaving an artifact Pi-lines Dirt or stain on a roller 3.14 inches apart Pressure marks Irregular or dirty rollers Small, circular patterns are produced

8 Hypo Retention Yellowish stain that appears on finished radiograph Due to inadequate washing Remaining thiosulfate from fixer solution

9 Handling And Storage Artifacts They occur during darkroom handling or during storage before use. Light or Radiation Fog White light streaks Safelight too close or wrong wattage Film left in x-ray room during exposure

10 Kink Marks Improper handling or storage Appears as a fingernail mark

11 Static Caused by buildup of electrons in the emulsion Three types of static artifacts Crown Tree Smudge

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13 FILMS STUCK TO EACH OTHER DURING PROCESSING

14 HYPORETENTION

15 ROLLER MARKS

16 PI-LINE

17 GUIDE SHOE MARK

18 WATER STAIN

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20 STATIC (Tree Static)

21 STATIC (Crown Static)

22 STATIC (Smudge Static

23 FINGER MARKS

24 CRIMPING MARK

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26 PICK-OFF

27 WATER STAIN

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30 MOTION

31 POOR FILM SCREN CONTACT

32 ARTIFACT????

33 H.T. (high Voltage) CABLES

34 ROTATION + FOG

35 DOUBLE EXPOSURE

36 BACKSCATTER OR CASSETTE UPSIDE-DOWN

37 BACKSCATTER

38 BACKSCATTER OR CASSETTE UPSIDE-DOWN

39 MOIRE EFFECT Are artifacts also called zebra pattern Artifact It is a double set of grid lines caused by the placement of a grid cassette in a Bucky tray.

40 WARPED CASSETTE-LIGHT LEAK

41 HAIR BUN

42 CLOTHES RIBBING

43 TUBE

44 HAIR STREAKING

45 GRID CUT-OFF

46 JEWELLERY

47 HEARING AID

48 LIGHTER IN THE POCKET

49 SCATTER FOG

50 SANDBAG

51 UMBILICAL RING

52 AIR IN THE VENTRICLES AIRHEAD?????

53 PLASTER

54 DIRT ON THE SCREEN

55 PATHOLOGY

56 FOGGING

57 KYPHOSIS-CHIN

58 STRAP

59 SCRATCHES

60 STATIC

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62 Intra Uterine Device

63 Chole clips

64 Earring Artifact

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66 Patient Movements


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