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    Artifact Analysis

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    Vignesh Raja
    This document discusses different types of artifacts that can appear on medical images and their causes. It identifies three periods when artifacts can occur: during exposure, processing, or film handling/storage. Exposure artifacts are caused by issues during the exam like poor positioning or motion. Processing artifacts result from problems in the darkroom like dirty rollers. Handling artifacts occur after processing from improper storage or lighting. Common artifacts include roller marks, hypo retention, static, and light or radiation fog. Understanding artifacts is important to identify their source and take corrective action to reduce image rejects.

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    Artifact Analysis

    Uploaded by

    Vignesh Raja
    112 views66 pages
    This document discusses different types of artifacts that can appear on medical images and their causes. It identifies three periods when artifacts can occur: during exposure, processing, or film handling/storage. Exposure artifacts are caused by issues during the exam like poor positioning or motion. Processing artifacts result from problems in the darkroom like dirty rollers. Handling artifacts occur after processing from improper storage or lighting. Common artifacts include roller marks, hypo retention, static, and light or radiation fog. Understanding artifacts is important to identify their source and take corrective action to reduce image rejects.

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    Artifacts

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    This document discusses different types of artifacts that can appear on medical images and their causes. It identifies three periods when artifacts can occur: during exposure, processing, or film handling/storage. Exposure artifacts are caused by issues during the exam like poor positioning or motion. Processing artifacts result from problems in the darkroom like dirty rollers. Handling artifacts occur after processing from improper storage or lighting. Common artifacts include roller marks, hypo retention, static, and light or radiation fog. Understanding artifacts is important to identify their source and take corrective action to reduce image rejects.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    112 views66 pages

    Artifact Analysis

    Uploaded by

    Vignesh Raja
    This document discusses different types of artifacts that can appear on medical images and their causes. It identifies three periods when artifacts can occur: during exposure, processing, or film handling/storage. Exposure artifacts are caused by issues during the exam like poor positioning or motion. Processing artifacts result from problems in the darkroom like dirty rollers. Handling artifacts occur after processing from improper storage or lighting. Common artifacts include roller marks, hypo retention, static, and light or radiation fog. Understanding artifacts is important to identify their source and take corrective action to reduce image rejects.

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    © All Rights Reserved
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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 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 anatomy
     An unwanted
    density on the
    radiograph
     Interferes with
    diagnosis
    There Are Three Time Periods
    In Which Artifacts Can Occur
     During exposure
     During processing
     During film
    handling, prior to
    processing,
    loading cassette, or

    11 3
    storing
    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.
    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


    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
    Hypo Retention
     Yellowish stain that appears on finished
    radiograph
     Due to inadequate washing
     Remaining thiosulfate from fixer solution
    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
    Kink Marks
     Improper handling or storage
     Appears as a fingernail mark
    Static
     Caused by buildup of electrons in the emulsion
     Three types of static artifacts
     Crown
     Tree
     Smudge
    FILMS STUCK TO EACH OTHER
    DURING PROCESSING
    HYPORETENTION
    ROLLER MARKS
    PI-LINE
    GUIDE SHOE MARK
    WATER STAIN
    STATIC (Tree Static)
    STATIC (Crown Static)
    STATIC (Smudge Static
    FINGER MARKS
    CRIMPING MARK
    CRIMPING MARK
    PICK-OFF
    WATER STAIN
    WATER STAIN
    MOTION
    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 Artifact


    It 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 VENTRICLES
    AIRHEAD?????
    PLASTER
    DIRT ON THE SCREEN
    PATHOLOGY
    FOGGING
    KYPHOSIS-CHIN
    STRAP
    SCRATCHES
    STATIC
    Intra Uterine Device
    Chole clips
    Earring Artifact
    Patient Movements

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