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30 Cards in this Set
- Front
- Back
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What types of image receptors are there?
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-Film
-Film/Screen combinations -Electronic sensors -Computed tomography - CT scan -Gamma cameras |
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What is the film packet made of, what are the two properties?
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Film base that is coated with an emulsion of silver halide crystals suspended in a layer of gelatin
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What is the purpose of the lead foil?
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To sheild from scatter radiation
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Where is the lead foil placed in relation to the PID?
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On the side of the film, away from the PID
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What is the purpose of the dual film packet?
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-Legal evidence
-Insurance -When needed to be sent to another DDS |
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What is both sides of the film coated with?
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Emulsion
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What is the advantage to have the film on both sides?
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Radiograph can be viewed correctly from either side
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What part of the emulsion is changed by the x-rays as they pass through the film?
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Silver halide crystals turn to black specks
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What is the latent image?
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When x-rays strike and ionize some of the crystals; image is visible after processing
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What determines the speed or sensitivity of the film?
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-Size of silver halide cryatal
-Thickness of emulsion |
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What does the speed or sensitivity determine?
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The amount of radiation required to produce a radiograph of standard density; Faster the speed, the less radiation
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What effect do larger crystals have on the speed and radiation?
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-Larger the crystal teh faster
-Large crystals result in less defination and detail |
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What kind of image do larger crystals create?
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Less defination and detail
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What kind of image do smaller crystals create?
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-Image sharpness is better
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What is the range of film speed?
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A-F (A=slowest F=fastest)
Should only be using E adn F speed films |
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What film is used in dentistry?
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Extraoral and Intraoral
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What are the different size films available?
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-5x7, 8x10, 10x12, 5x12
-0 pedo, 1 & 2 large children and adults, 3 long bitewing, and 4 occlusal |
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What kind of shelf life does x-ray film have?
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Limited shelf life but can store in fridge to extend life
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What should x-ray film be protected from?
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Light, heat, moisture, chemicals, aromatic substances, and scatter radiation
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What is density?
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Film blackness
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What is contrast?
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How sharply teh dark adn light areas are differentiated
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What is object contrast? And how is it determined?
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-Amount of radiation transmitted (Mass of object)
-Thickness, density, chemical compound, quality of x-ray beam, and scatter radiation |
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What is film contrast? How is it determined?
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-The characteristics of the x-ray film that enables it to portray differenced in subject contrast
-Amount of radiation transmitted, properties of the film, intensifying films, film processing, and viewing container |
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What is a long gray scale?
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Occurs with good contrast and higher KVP
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What is a short gray scale?
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Occurs with poor contrast and lower KVP
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What does the KVP do?
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Varies the contrast
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What does higher KVP do? Lower KVP?
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-Low contrast films and long gray scales
-High contrast films and short gray scales |
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What is the Inverse Square Law?
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The shorter the distance between the target and the object, the more intense the radiation
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What does a higher MA do? Lower MA?
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-Higher MA=Higer radiation
-Lower MA=Lower radiation |
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What is radiopaque? Radiolucent?
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Paque- Light or white
Lucent- Dark or black |
