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RADT 456 Unit 3

ARRT registry review Unit 3: Image Acquisition and Evaluation

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