Chapter 8

2. The ejected electron resulting from the Compton effect interaction; also called Compton electron.
5. Combination of rows and columns (array) of pixels that make up a digital image.
7. An interaction that occurs with low-energy x-rays, typically below the diagnostic range. The incoming photon interacts with the atom, causing it to become excited. The x-ray does not lose energy but changes direction.
9. Unwanted exposure on the radiographic image that does not provide any diagnostic information.
10. the range of exposure intensities that an image receptor can respond to and acquire image data.
12. The invisible image that exists on the image receptor before it has been processed.
13. The electron ejected from an atom during a photoelectric interaction.
18. A device that receives the radiation leaving the patient.
20. The use of a continuous beam of x-rays to create dynamic images of internal structures that can be viewed on a display monitor.
23. The attenuated x-ray beam leaves the patient and is composed of both transmitted and scattered radiation; also called remnant radiation.
24. The removal of an electron from an atom.
25. The attenuated x-ray beam leaving the patient that is composed of both transmitted and scattered radiation; also called exit radiation.

1. Incoming photons are not absorbed but instead lose energy during interactions with the atoms composing the tissue.
3. Matter per unit volume, or the compactness of the atomic particles composing the anatomic part.
4. In the diagnostic range, the total absorption of the incident photon by ejecting an inner-shell electron of a tissue atom.
6. The x-ray photons removed from the x-ray beam as a result of the uptake of their energy by body tissues.
8. Used to describe the ability of the imaging system to distinguish between small objects that attenuate the x-ray beam similarly in digital imaging.
11. Scattering that results from the loss of some energy of the incoming photon when it ejects an outer-shell electron from a tissue atom.
14. Picture element; the smallest component of the matrix, which is represented as a single brightness level on a computer monitor.
15. The difference between the x-ray photons that are absorbed photoelectrically versus those that penetrate the body.
16. X-ray photons that pass through the body to expose the image receptor.
17. Reduction in the energy or number of photons in the primary x-ray beam after it interacts with anatomic tissue.
19. The electron ejected from an atom during a Compton scattering event.
21. Also called number of bits (e.g., 12, 14, or 16), it affects the number of shades of gray available for image display.
22. The visible radiographic image on the exposed detector after processing.