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X-Ray Test 1
X-Ray Tube
| Question | Answer |
|---|---|
| 1. The most widely used support structure for the x-ray tube is the... | ceiling support system |
| 2. The external structure of the x-ray tube includes the support structure, the protective housing, and the ... | glass envelope |
| 3. The negative side of the x-ray tube holds the ... | filament |
| 4. What is the most common cause of tube failure? | tungsten vaporization |
| 5. The target of the rotating anode is usually coated with a ________ alloy. | tungsten |
| 6. The ______ is the source of radiation in the x-ray tube. | focal spot |
| 7. High capacity tube rotors revolve at ______. | 10,000 rpm |
| 8. The x-ray intensity is lower on the anode side of the tube because of the ... | heel effect |
| 9. Tube failure can occur from ... | long exposure times |
| 10. A dual focus tube has two | filaments |
| 11. Each tube has its own tube rating chart to show... | maximum exposure time |
| 12. The _______ is/are outside the glass envelope. | stators |
| 13. The heel effect is caused by the ... | anode angle |
| 14. The effective focal spot size is _____ the actual focal spot size. | smaller than |
| 15. Localized pitting or cracking on the anode can occur from ... | a single excessive exposure |
| 16. Most of the heat generated at the target is due to ... | outer-shell excitation |
| 17. The production of heat at the anode is directly proportional to ... | tube current |
| 18. Approximately _____% of the kinetic energy of the projectile electrons is converted to x-rays at the target. | 1% |
| 19. Electron interations at the inner shell of the target atoms produce _____ radiation. | characteristic |
| 20. The useful characteristic x-rays from tungsten targets are _____(shell) x-rays. | K-shell |
| 21. Most of the x-rays produced at the target are _____. | bremsstrahlung |
| 22. At 55 kVp ____% of the x-rays produced are bremsstrahlung. | 100% |
| 23. Bremsstrahlung x-rays are produced by _____ at the target. | slowing electrons |
| 24. Characteristic x-rays are produced by ... | released binding energy |
| 25. An exposure taken at 100 kVp would have a continuous emission spectrum with a maximum energy of _____ keV. | 100 |
| 26. An increase in mAs would (increase or not affect) the (amplitude or position) of the emission spectrum. | increase, amplitude |
| 27. The discrete portion of the x-ray emission spectrum would change position with a change in (kVp, target material, or voltage ripple). | target material |
| 28. How does added filtration affect the emission spectrum? (increased or reduced amplitude) and (shift to right or left) | reduced, right |
| 29. The number of useful x-rays in the beam defines x-ray... (kVp, quality, quantity or mAs) | quantity |
| 30. Standard x-ray machines produce about ___ mR/mAs at 70 kVp measured at 100 cm SID. | 5 mR/mAs |
| 31. If filter thickness is _____, then x-ray intensity is _____. (increased or reduced) and (increased or reduced). | There are two answers increased, reduced and reduced, increased (filtration is proportional to spectrum, speed inversely to dose). |
| 32. If x-ray quantity is doubled, the optical density on the finished radiograph will be ... (reduced by half, just slightly increased or increased by a factor of two) | increased by a factor of two |
| 33. If a technologist changes the technique from 70 kVp @ 200 mAs to 70 kVp @ 400 mAs, then the x-ray intensity will ____ and optical density will ____. (double or remain the same) both lines | double, double |
| 34. An increase of 15% in kVp is equivalent to increase mAs ____%. | 100 |
| 35. If an exposure is 50 mR at an SID of 40 inches, what would the exposure be at an SID of 60 inches? | 22.2mR (inverse square law) |
| 36. An x-ray beam that could pass through dense tissue would have high ____. (penetrability, quality or quantity). | Both penetrability and quality |
| 37. A low quality beam would also have low ... (penetrability, quantity, mAs or intensity). | penetrability |
| 38. Image contrast is affected by ... (beam quality, kVp or mAs). | Both beam quality and kVp |
| 39. Added filtration will ____ beam quality and ____ beam quantity. (decrease or increase) both lines. | increase, decrease |
| 40. The scattered x-ray from a Compton interaction usually retains ____ of the energy of the incident photon. (none, little, most, all) | most |
| 41. Compton scatter is directed at ____ degrees angle from the incident beam. (0, 180, 90, any) | any degrees |
| 42. Only at energies above 10MeV can ____ take place. (photodisintegration, pair production, Compton Scatter or photoelectric absorption) | photodisintergration |
| 43. When the mass density of the absorber is ___, it results in ____ Compton scatter. (increased or decrease) both lines | increased, increased |
| 44. Because of differential absorption, about ___% of the incident beam from the x-ray tube contributes to the finished image. | 0.5% |
| 45. Attenuation is caused by ___. (absorption, scattering or transmission) | absorption and scattering |
| 46. Barium is a good contrast agent because of its... | high atomic number |
| 47. The use of contrast agents increases the amount of (differential absorption, Compton scatter or photoelectric absorption) | All of them |
| 48. A negative contrast agent is ___. (air, iodine, barium or water) | air |
| 49. X-rays transmitted without interaction contribute to ... (photoelectric absorption, the radiographic image, image fog or beam attenuation) | the radiographic image |
| 50. If 5% of an incident beam is transmitted through a body part, then 95% of that beam was ... (scattered, attenuated, absorbed or back-scattered) | attenuated |
Created by:
radtechstudent
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