Term
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Definition
| electrons traveling from cathode to anode |
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Term
| what happens when electrons hit the heavy metal atoms of the target |
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Definition
| they transfer their kinetic energy to the target atoms |
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Term
| projectile electrons interactions result in |
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Definition
| kinetic energy being converted to thermal and electromagnet in the form of infared radiation and x-rays |
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Term
| what happens when projectile electrons don't transfer enough energy to ionize the target atoms |
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Definition
| the outer shell electrons are simply raised to an excited, or higher, energy level |
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Term
| what happens with the emission of infared radiation |
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Definition
| outer shell electrons immediately drop back to their normal energy level |
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Term
| how is heat production related to tube current |
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Definition
| they are directly related |
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Term
| what is produced when projectile electrons interact with inner-shell electrons of the target |
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Definition
| characteristic x-rays can be produced |
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Term
| why is it called characteristic x-radiation |
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Definition
| because it is characteristic of the target element |
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Term
| what causes characterstic x-rays to be emitted |
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Definition
| when an outer-shell electron fills an inner-shell road |
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Term
| which shell of the tungsten atom is the only one that is useful for imaging |
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Definition
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Term
| when are Bremsstrahlung x-rays produced |
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Definition
| when a projectile electron is slowed by the electric field of a target atom nucleus |
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Term
| what does Bremsstrahlung mean |
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Definition
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Term
| how is brem radiation different from characteristic radiation |
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Definition
| characteristic has very specific energies while brems can have any energy level up to the corresponding level of kVp |
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Term
| in diagnostic imaging are most x-rays brems or charactersitcs |
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Definition
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Term
| characterstic x-ray emission spectrum |
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Definition
| precisely fixed energies that form a discrete spectrum |
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Term
| Bremsstrahlung x-ray emission spectrum |
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Definition
| range of energies that form a continuous emission spectrum |
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Term
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Definition
| a plot of individual x-ray energies for a given x-ray beam |
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Term
| Factors affecting spectrum: current (mAs) |
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Definition
| increase quantity, no change in quality |
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Term
| factors affecting spectrum: voltage(kVp) |
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Definition
| increae quantity, increase quality |
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Term
| factors affecting spectrum: added filtration |
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Definition
| decrease quantity, increase quality |
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Term
| factors affecting spectrum: increased target atomic number |
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Definition
| increase in quantity, increase in quality => increases efficiency of x-ray production and energy of characteristic and brem x-rays |
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Term
| factors affecting spectrun: increased voltage ripple |
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Definition
| decrease in quantity, decrease in quality |
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Term
| what is hardening of the beam |
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Definition
| adding filtration that increases its average energy |
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Term
| 3 phase power is = to how much increase in kVp |
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Definition
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Term
| high frequency power is = to how much increase in kVp |
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Definition
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