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RADT 456 Equip Oper
Unit 5 Equip Oper and Quality Control
| Question | Answer |
|---|---|
| Measured in hertz | Frequency |
| Wavelenth and frequency are _________ related. | Inversely |
| The distance between successive crests | Wavelenth |
| X-ray photons emerging from a part and help contribute to the formation of an image | Remnant or exit beam |
| The gradual decrease in exposure rate as radiation passes through tissues | Attenuation |
| Incoming photon's energy is absorbed as it ejects an inner shell electron from orbit | Photoelectric Effect |
| Incoming photon uses part of its energy to eject outer shell electron; the photon changes direction (scatters) but retains much of its energy | Compton Scatter |
| Photoelectric effect contributes to ________ dose. | Patient |
| Compton scatter contributes to ________ dose. | Occupational |
| Change mechanical energy to electrical energy | Generators |
| Change electrical energy into mechanical energy | Motors |
| Height of the wave | Amplitude |
| Number of cycles per second | Frequency |
| Amplitude and polarity of the current vary periodically with time | Alternating Current (AC) |
| An AC, producing a continuosly moving magnetic field is necessary for _______ ________ to occur. | Mutual Induction |
| The degree to which transformers increase the voltage is determined by | Turns Ratio |
| Transformers that increase the voltage | Step-up Transformers |
| Positve electrode of the x-ray tube | Anode |
| Negative electrode of the x-ray tube | Cathode |
| Vacuum of the x-ray tube | Glass Envelope |
| Air within glass envelope (eventually leads to oxidation and burnout of filament). | Gassy Tube |
| Filament is made of _______. | Tungsten |
| The anode rotates at approximately ________. | 3,600 rpm |
| Part of induction motor that in outside of the glass envelope | Stator |
| Part of induction motor that is inside the glass envelope | Rotor |
| The width of the beveled focal track | Actual Focal Spot |
| The effective focal spot is always smaller than the actual focal spot | Line Focus Principle |
| 4 causes of tube failure: | Vaporized tungsten, pitted anode, cracked anode, and gassy tube |
| Primary control center for the computer consisting of a control unit, arithmetic unit, and memory | Central Processing Unit |
| As matrix size increases, there are more and smaller pixels which results in improved | Spatial Resolution |
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lmdegraffe
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