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Artifact analysis

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

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Artifact analysis

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  1. Artifact analysis

  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

  12. Processing Artifacts

  13. FILMS STUCK TO EACH OTHER DURING PROCESSING

  14. HYPORETENTION

  15. ROLLER MARKS

  16. PI-LINE

  17. GUIDE SHOE MARK

  18. WATER STAIN

  19. Handling Artifacts

  20. STATIC (Tree Static)

  21. STATIC (Crown Static)

  22. STATIC (Smudge Static

  23. FINGER MARKS

  24. CRIMPING MARK

  25. CRIMPING MARK

  26. PICK-OFF

  27. WATER STAIN

  28. WATER STAIN

  29. Exposure Artifacts

  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

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