Chapter Test 1 Review

3. Refers to objects that are distorted to appear longer than the true object.
6. This activates the barium fluorohalide in computed radiography.
8. This sets the midpoint of the range of brightness levels visible in the image
11. This component includes the readout, charge collector, and light-sensitive elements in an indirect digital system.
12. Scatter radiation that creates unwanted exposure of the image.
13. Characteristics of the anatomic part are determined by its composition, such as, thickness, atomic number, and tissue density.
14. The radiographic quality that includes brightness and contrast.
17. This has to be applied to the base layer of a direct digital system when using amorphous silicon.
20. This is used as the photodetector within an indirect digital system.
21. This is coupled to a cesium iodide plate via a fiber optic cable or optical lens.
22. This radiographic quality of sharpness is measured by lp per mm.
23. this is a measure of the imaging system's ability to display the contrast of anatomic objects of varying size.
24. The image viewed on the computer monitor.
26. Each projection has one of these that is compared to the image receptors for the given exposure.

1. ________________ decreases as tissue density increases.
2. Differences in tissue thickness, tissue density, and effective atomic number contribute to __________________.
4. This happens if an image receptor is extremely overexposed.
5. This is a range of exposure values to the receptor that produce an acceptable range of densities for diagnostic purposes.
7. Refers to when not enough photons make it to the image receptor.
9. This part of the digital system amplifies the signal.
10. In computed radiography, this stores the latent image.
15. This allows for imaging files to be accessed from various workstations located throughout the facility or even outside with special permission.
16. An imaging system's reference to the range of exposure intensities an image receptor can accurately detect.
18. This is the imaging system's ability to distinguish between small objects having similar brightness levels or shades of gray.
19. When an incoming photon loses energy and changes direction because of ______________.
25. The new acronym for PACS approved by the FDA in 2021.