ARRT registry review Unit 3: Image Acquisition and Evaluation
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| 1. During film-screen imaging, when is the manifest image formed? | in the developer solution
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| 2. What is the component of a CR image plate that records the radiologic image? | photostimulable phosphor
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| 3. The term windowing describes the practice of _____ | changing the image contrast and / or density
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| 4. What can foreshortening be caused by? | the radiographic object being placed at an angle to the IR
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| 5. What is the purpose of the automatic processor's transport system? | move the film and change its direction
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| 6. What causes crescent-shaped artifacts on processed x-ray film? | acute bending of the film before or after exposure
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| 7. Misalignment of the tube-part-IR relationship results in______ | shape distortion
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| 8. Using a short SID with a large IR is likely to____ | increase the anode heel effect
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| 9. When intensifying screen increases, what happens to radiographic density? | increases
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| 10. How can you improve spatial resolution but still use the same FOV? | use a larger matrix
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| 11. What is the absorption of useful radiation by a grid called? | grid cutoff
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| 12. When is focal-spot blur at its greatest? | toward the cathode end of the x-ray beam
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| 13. What is it called when the x-ray photon intensity is reduced as the photon passes through material? | attenuation
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| 14. What is the density of an unexposed and processed film? | 0.1
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| 15. What device is used to overcome severe variation in patient anatomy or tissue density, providing more uniform radiographic density? | compensating filter
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| 16. What test is performed to check the correctness of the developing parameters? | sensitometry
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| 17. What is the purpose of the thin layer of lead that is often located behind the rear intensifying screen in an IR? | prevent scattered radiation fog
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| 18. What will result if developer replenishment is inadequate? | images with excessively low contrast
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| 19. What can be used to determine the sensitivity of a particular film emulsion? | sensitometric curve
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| 20. What is a wire-mesh test performed to evaluate? | screen contact
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| 21. What accessory is used to measure the thickness of body parts in order to determine optimal selection of exposure factors? | caliper
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| 22. What is a focal-spot size of 0.3mm or smaller essential for? | magnification radiography
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| 23. What is the device that is used to give film emulsion a predetermined exposure in order to test its response to processing called? | sensitometer
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| 24. What is the relationship between the height of a grid's lead strips and the distance between them referred to? | grid ratio
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| 25. What material is film base currently made of? | polyester
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| 26. What happens to the image when a slow screen-film system is used with a fast screen-film AEC system? | the images are too light
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| 27. What effect will a stained intensifying screen have on the finished radiograph? | decreased density
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| 28. What will boxes of film stored in a too warm an area be subject to? | film fog
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| 29. What term is used to describe unsharp edges of tiny radiographic details? | blurr
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| 30. What chemical is used in the production of radiographic film emulsion? | silver halide
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