2Artifact analysisOne 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.
3What Is An Artifact? Any optical density that is not anatomy An unwanted density on the radiographInterferes with diagnosis
4There Are Three Time Periods In Which Artifacts Can Occur During exposureDuring processingDuring film handling, prior to processing, loading cassette, or storing
5Exposure ArtifactsThey are caused by the patient, the technologist, or the equipment during a diagnostic procedurePoor screen-film contactImproper use/positioning of a gridDouble exposurePatient motionPoor patient preparationClothing, jewelery, glasses, belts, etc.
6Processing ArtifactsThey are caused by or occur during the processing of diagnostic imagesDirty RollersWill leave deposits on filmAreas of increased or reduced densityOccasionally some sludge may not be washed off and dried onto the filmChemical FogImproper or inadequate chemistryLeaves a uniform dull gray haze on the filmMay also be seen in two different colorsReferred to as dichroic stain
7Guide Shoe and Roller Marks Guide shoes are sprung or improperly positionedThe ridges in the guide shoe press against the film leaving an artifactPi-linesDirt or stain on a roller3.14 inches apartPressure marksIrregular or dirty rollersSmall, circular patterns are produced
8Hypo Retention Yellowish stain that appears on finished radiograph Due to inadequate washingRemaining thiosulfate from fixer solution
9Handling And Storage Artifacts They occur during darkroom handling or during storage before use.Light or Radiation FogWhite light streaksSafelight too close or wrong wattageFilm left in x-ray room during exposure
10Kink MarksImproper handling or storageAppears as a fingernail mark
11Static Caused by buildup of electrons in the emulsion Three types of static artifactsCrownTreeSmudge