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Artifact analysis . Artifact analysis. One of the causes of rejected images listed in the repeat analysis worksheet is the presence of image artifacts. - PowerPoint PPT Presentation
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Artifact analysis
Artifact analysis Artifact 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.What Is An Artifact?
Any optical density that is not anatomyAn unwanted density on the radiographInterferes with diagnosisThere Are Three Time Periods In Which Artifacts Can Occur
During exposureDuring processingDuring film handling, prior to processing, loading cassette, or storingExposure 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.Processing 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 stainGuide Shoe and Roller MarksGuide 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 producedHypo RetentionYellowish stain that appears on finished radiographDue to inadequate washingRemaining thiosulfate from fixer solutionHandling And Storage ArtifactsThey 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 exposureKink MarksImproper handling or storageAppears as a fingernail markStaticCaused by buildup of electrons in the emulsionThree types of static artifactsCrownTreeSmudgeProcessing ArtifactsFILMS STUCK TO EACH OTHER DURING PROCESSING
HYPORETENTION
ROLLER MARKS
PI-LINE
GUIDE SHOE MARK
WATER STAIN
Handling ArtifactsSTATIC (Tree Static)
STATIC (Crown Static)
STATIC (Smudge Static
FINGER MARKS
CRIMPING MARK
CRIMPING MARK
PICK-OFF
WATER STAIN
WATER STAIN
Exposure ArtifactsMOTION
POOR FILM SCREN CONTACT
ARTIFACT????
H.T. (high Voltage) CABLES
ROTATION + FOG
DOUBLE EXPOSURE
BACKSCATTER OR CASSETTE UPSIDE-DOWN
BACKSCATTER
BACKSCATTER OR CASSETTE UPSIDE-DOWN
MOIRE EFFECT
Are artifacts also called zebra pattern ArtifactIt is a double set of grid lines caused by the placement of a grid cassette in a Bucky tray.WARPED CASSETTE-LIGHT LEAK
HAIR BUN
CLOTHES RIBBING
TUBE
HAIR STREAKING
GRID CUT-OFF
JEWELLERY
HEARING AID
LIGHTER IN THE POCKET
SCATTER FOG
SANDBAG
UMBILICAL RING
AIR IN THE VENTRICLESAIRHEAD?????
PLASTER
DIRT ON THE SCREEN
PATHOLOGY
FOGGING
KYPHOSIS-CHIN
STRAP
SCRATCHES
STATIC
In CT Scan ArtifactsIntra Uterine Device
Chole clips
Earring Artifact
MRI artifactsPatient Movements
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