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unit 4 phys ?

QuestionAnswer
1. Interaction that will result in a subsequent annihilation reaction pair production
2. Added filtration will_____ beam quality and _____ beam quantity increase, decrease
3. Interaction where the incident x-ray will retain at least 2/3 of its original energy after interaction with target atom Compton scatter
4. The two primary forms of x-ray interaction in the diagnostic range are Compton scattering and photoelectric absorption
5. The ______ of an x-ray beam is higher when the peak of the continuous emission spectrum is further to the ________ quality, right
6. Compensating filter is used to create _____ receptor exposure ( or optical density with analog imaging) with a body part of _____ thickness uniform, non-uniform
7. A negative contrast agent is air
8. Beam quality is affected by kVp and filtration
9. ____ only occurs at the very high energies used in radiation therapy and in nuclear PET imaging pair production
10. Because of differential absorption, about _____ of the incident beam from the x-ray rube contributes to the finished image .5%
11. The efficiency of x-ray production increases as ____ increases kVp
12. a 15% increase in kVp is equivalent to doubling the mAs
13. bremsstrahlung x-rays have a range of energies and form a ______ emmission spectrum continuous
14. when the mass density of the absorber is ___, it results in _____ Compton scatter increased, increased
15. only at energies above 10 MeV can ____ take place photodisinitgration
16. the penetrability of an x-ray is called x-ray quality
17. if filtration thickness is _____ then x-ray intensity is__ a. reduced, reduced b. increased, reduced c. reduced,increased d. both b and c d. both B and C
18. x-ray quantity increases in direct proportion to increases in _____ mAs
19. which x-ray interaction would involve ejection of a K-shell electron photoelectric absorption
20. interaction that is the primary interaction responsible for patient dose photoelectric effect
21. high kVp techniques reduce patient dose
22. an incident x-ray interacts with an atom without ionization during ______ coherent scattering
23. an increase in mAs would ____ the _____ emission spectrum increase, amplitude only
24. roentgens (or grays) is the measurement for x-ray ____ a. quantity b. exposure c. intensity d. all of the above all the above
25. interaction that causes bones to appear radiopaque on a radiograph photoelectric effect
26. approximately ____ of the kinetic energy of the projectile electrons is converted to x-rays at the target 1%
27. Image fog/ excess grays on an image in diagnostic imaging is caused by Compton scatter
28. Most of the x-ray produced at the target are bremsstrulung
29. As kVp ____, the probability of photoelectric absorption ____ increases, decreases
30. X-ray beam quality is improved by increasing filtration
31. Compton interactions, photoelectric absorption and transmitted x-rays all contribute to _____ differential absorption
32. _____ relates to the different degrees of absorption in different tissues that result in image contrast information of the X ray image differential absorption
33. which of the following is a form of radiation bremmstrulung
34. electron interactions with the electrons have an inner shell of the target atoms produce ____ radiation characterisitc
35. The main purpose of added filtration is to reduce patient dose
36. interaction that is responsible for occupational exposure of the radiologic technologist during fluoroscopy Compton scatter
37. At 55 kVp nearly _____ of the x-rays produced with a tungsten focal spot are bremsstrahlung 100%
38. interaction that results in nuclear fragments being admitted photodisintigration
39. The useful characteristic x-rays from tungsten xrays are ____ x-rays k-shell
40. interaction that is responsible for the backscatter image on a radiograph Compton scatter
41. Interation that occurs with x-rays below 10 keV coherent scatter
42. The half value layer of an x-ray beam is a measurement of beam _____ quality
43. During an exposure most of the ____ energy of the projectile electrons is converted to ____ kinetic, heat
44. Characteristic K shell X-rays of tungsten atoms will have an effective energy of ____ keV 69
45.The use of contrast agents increases the amount of a.differential absorption b.compton scatter c.photoelectric absorption d. all of the above all the above
46. interaction where the incident X ray interacts with target atom which releases another X ray of equal energy in a different direction coherent scatter
47. Interaction that results in the creation of antimatter pair production
48. Differential absorption is dependent on the ____ a.kVp of the exposure b.atomic number of the absorber c.the mass density of the absorber d. all of the above all the above
49. The inverse square law has the same effect on receptor exposure and x-ray intensity
50. Attenuation of caused by a. absorption b. scattering c.transmissiond. d. Both a and b. both a and b
51. Projectile electrons travel from cathode to anode
52. Compton scatter photons are directed at (a) ____ angle from the incident beam any
53. Which has the greatest mass density bone
54. An increase in kVp would ____ the ____ of the emission spectrum increase, amplitude and peak position
55. The energy level of a characteristic x-ray is determined by difference in the binding of the ejected electron and the electron that fills the vacancy
56. if the distance from the source to the image is reduced by half how is the X ray intensity of the image affected it is increase 4 times
57. An outer-shell electron is ejected, and the atom is ionized with Compton scattering
58. an exposure taken at 100 KVP would have a continuous emission spectrum with a maximum energy of ___ keV 100
59. interaction that will result in a subsequent characteristic x-ray mission to fill inner shell vacancy photoelectric effect
Created by: sydniehardin1214
 

 



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