X-ray tube test 6/2
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| show | tungsten = cause it has a high atomic #(74), heating point (3410), k-edge (69)
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| show | negatively charged metal = like nickle
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| show | it settles on the bottom of the tube and acts as filtration and can cause arching
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| show | when you break the vacuum seal, so much disruption will make the x-ray blank (no exposure) or arching (sparks) and eventually will break
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| show | its air tight to not allow disruption of e-'s
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| what is the purpose of the focusing cup? | show 🗑
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| what is the purpose of the anode? | show 🗑
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| show | produces e-beam
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| what is the purpose of the tube warm-up? | show 🗑
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| show | as the target angle decreases, so does the effective FSS (DIRECT) - target angle allows for a larger actual FS & provides a smaller effective FS
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| what is the purpose of the rotating anode? | show 🗑
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| what is the purpose of the tube housing? | show 🗑
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| show | melting point = 3410 degrees,
Z# (atomic #) = 74,
k-edge = 69 keV
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| show | it has a 2 filaments = allows for small FSS & large FSS
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| show | mA x time x kVp
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| show | mA x time x kVp x 1.35
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| how would you calculate the heat units for a 3 phase 12 pulse unit? | show 🗑
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| show | 100 mA, 1 sec, 65-70 kVp, large FSS
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| what is the difference between actual and effective focal spot sizes? | show 🗑
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| list the most common tube anode angle and the effect of angle size on focal spot size? | show 🗑
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| Define tube current? | show 🗑
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| State the amperage and voltage ranges used to heat the filament? | show 🗑
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| What is the component that sits outside the glass envelope of the tube? | show 🗑
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| show | autotransformer
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| show | 3,400 - 10,000 rpm
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| show | = any radiation off the focal track - the FDA says the housing must reduce amount to <100mR/hr at 1 m
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| show | scattered radiation = happens in pt (fog) ............
off-focus radiation = happens in tube (ghosting)
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| show | warm-up and excessive rotoring
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| what amount of lead is the protective housing made of? | show 🗑
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| what is the purpose of oil? | show 🗑
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| show | it has 2 electrodes = + anode & - cathode
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| show | coolidge (old = cold cathode/crookes tube)
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| what does the rotor work off of? | show 🗑
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| show | less
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| what are 3 ways heat can be dissipated from rotating anode? | show 🗑
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| show | 1.5 mm Pb
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| show | window or port
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| Leakage radiation is reduced to _____________ by the ___________. | show 🗑
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| show | protect against shock.
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| Dissipates heat away from the tube and serves as an insulator. | show 🗑
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| show | conducts electrons through the tube, provides mechanical support for target, good thermal radiator - dissipates heat to prevent pitting or cracking
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| What is tube tanning? | show 🗑
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| Isotropically | show 🗑
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| show | Effective FSS
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| Target area exposed to electrons. | show 🗑
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| show | Allows for a larger actual FS and provides a smaller effective FS
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| show | 100 mA, 65-75 kVp, Large FSS, 3-5 exposures, 1 sec. exp. time
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| show | Decrease xray intensity on anode side of useful beam because of absorption in heel of target
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| show | rotating and stationary
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| show | outside, within
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| show | tungsten vaporization
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| Holds filament, contains negative charge and focuses electrons onto target of anode. | show 🗑
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| What is leakage radiation? | show 🗑
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| show | mA x time x kVp
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| What is the equation used to determine how many heat units are produced with one exposure in a 3 phase 6 pulse unit? | show 🗑
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| show | mA x time x kVp x 1.41
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| Line focus principle | show 🗑
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Created by:
sr4095
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