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Artifacts

Diagnostic Imaging - VTT 224

QuestionAnswer
What is an artifact? Any unwanted radiograph density that forms a blemish on the film.
What is fogging? An overall grey appearance. The film was either exposed to excessive scatter radiation or exposed to prolonged safe light, or excessive heat during storage.
How are black crescents or lines formed? Rough handling of the film, creased or scratched. Fingerprint smudge from too much pressure.
How is a black irregular border caused? By light exposure while still in the box or film bin.
Static electricity discharge may appear as...? A tree or lightning strike.
How are film guide scratches caused? The film was fed crooked into the processor, and jammed when it was caught in the drive gears.
What is a kissing artifact? When more than one film is fed into the processor at once, only one side of the emulsion will be completely processed.
How are roller artifacts caused? Developer being on the entrance rollers, or pulling a film out of the processor feed tray.
What are white areas? Foreign materials (artifacts or dirt) that exist between the film and the screen, or chemical spills that cause permanent damage to the phosphor layer.
Overdeveloped film Increased density with poor contrast. Caused by being in developer too long, or chemicals too hot.
Underdeveloped film Decreased density with poor contrast. Caused by chemicals being too cold or old chemicals.
Uneven development Caused by unstirred, settled chemicals or light exposure during developing or uneven chemical levels.
Identical black spots on two films Caused by film sticking to each other in the fixer.
A brown image is caused by...? Old developer or if the wash tank is not properly filled, the fixer is retained on the the emulsion.
What is a run back artifact? When excess chemicals remain, it creates a streaky artifact.
Processor water marks are...? Water spots on the film.
What is Sante's Rule? 2 x (tissue thickness in cm) + FFD + Grid factor = kVp
When developing a technique chart, start with....? Determining a baseline mAs.
Created by: PimaVT