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RAD 106 Final
| Question | Answer |
|---|---|
| 1. Because of differential absorption, about _____% of the incident beam from the x-ray tube contributes to the finished image. | 1.0 |
| 2. Differential absorption in diagnostic imaging is primarily caused by ____________. | Pair Production |
| 3. When the mass density of the absorber is __________, it results in __________ Compton scatter. | Increased; Increased |
| 4. As kVp ___________, the probability of photoelectric absorption ______________. | Increases; Decreases |
| 5. Which has the greatest mass density? | Bone |
| 6. Attenuation is caused by ______________. | Absorption & Scattering |
| 7. Barium is a good contrast agent because of its __________________. | High atomic # |
| 8. At energies below 40 keV, the predominant x-ray interaction in soft tissue and bone is ______________. | Photoelectric Absorption |
| 9. Pair production is an interaction between an x-ray and a(n) _________ that causes the x-ray to disappear and causes two electrons to take its place. | Nuclear Electric Field |
| 10. __________ is one half the range from crest to valley over which the sine wave varies. | Amplitude |
| 11. The energy of a photon is ________________ proportional to its frequency. | Directly |
| 12. The autotransformer has one winding and varies with ________ and __________. | voltage; current |
| 13. How does added filtration affect the emission spectrum? | Reduced amplitude & shift to the right |
| 14. Changes in _______ result in directly proportional changes in the amplitude of the emission spectrum. | mAs |
| 15. Rubber and glass are ___________. | Insulators |
| 16. What is Ohm’s law? | I = V/R |
| 17. Characteristic x-rays are produced by __________________. | Released binding energy |
| 18. At 55 kVp, _____ of the x-rays produced are bremsstrahlung. | 100% |
| 19. The efficiency of x-ray production is ___________ the tube current. | Not affected by |
| 20. Characteristic K-shell x-rays have an effective energy of _____ keV. | 69 |
| 21. Most of the heat generated at the target is due to ___________. | Outer shell excitation |
| 22. Bremsstrahlung x-rays are produced by ______________ at the target. | slowing electrons |
| 23. Electron interactions at the inner shell of the target atoms produce _____ radiation. | characteristic |
Created by:
bailey.holden13