Question | Answer |
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 |