Xray tube
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| show | *contains the tube insert
*protects tube from shock
*protects operator & pt. from electric shock
*cools the anode; cools heat off tube
*rotates the anode
*protects the operator & patient from leakage radiation
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| show | steel
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| What does the oil inside the housing do? | show 🗑
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| show | cathode side
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| show | opening in tube which the xrays pass thru. provides attachment for the collimator covered by filters.
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| show | made of insulating plastic; receive cables from high voltage transformer; lubricated with petroleum jelly to prevent spark
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| show | stationary part of induction motor; rotates between 3,000-3,600rpm; 3 phase anode rotate 10,000rpm
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| What type of glass is the tube insert made out of? | show 🗑
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| What is the cathode made out of? | show 🗑
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| What is the function of the focus cup? | show 🗑
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| show | it adds e- & raises melting point
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| show | focal track
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| What are the 2 parts of the target? | show 🗑
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| show | part where e- hit; has a high melting point & high atomic number. There is a small amount
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| T/F: higher atomic number means higher melting point. | show 🗑
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| T/F: the anode stream inhibits transfer of heat from target to rotor. | show 🗑
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| Describe the ball bearings of the rotor. | show 🗑
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| show | crooke's tube
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| Why didn't the crooke's tube not last long? | show 🗑
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| show | had a vacuum and hot cathode tube.
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| What are the special types of tubes? | show 🗑
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| show | grid placed between cathode and anode = no e- flow; the grid has a negative charge and repels e- and prevents exposures. These are used in portables & cine radiography
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| show | circulating water is used to cool the tube
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| What kind of photons are produced by mammography tubes? | show 🗑
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| T/F: Therapy tubes operate at high kV and low mA and long exposure times. | show 🗑
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| T/F: Mammography tubes have less filtration than diagnostic xray tubes. | show 🗑
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| What factors affect tube performance? | show 🗑
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| show | target angle
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| show | actual focal spot
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| What is the size of the focal spot after the line-focus principle? | show 🗑
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| Tube 1: T.A.= 17 degrees; A.F.S = 3.45mm; E.F.S=1.0mm Tube 2: T.A.= 10 degrees; A.F.S = 3.45mm; E.F.S= 0.6mm Which tube can make more exposures? Which tube has better detail? | show 🗑
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| What is the relationship between the target angle on the anode and the effective focal spot? | show 🗑
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| show | Both tubes have the same effective focal spot so the detail is the same. Since tube 2 has a bigger actual focal spot size it can load more exposures.
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| show | tube current
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| What is the amount of current applied to filament; needs to be heated up to boil off e-? | show 🗑
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| show | filament current
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| show | more e- are boiled off which increases the tube current.
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| show | thermionic emission
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| show | true; tube current is dependent on filament current.
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| What is a filament circuit? | show 🗑
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| show | tungsten
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| What are 3 devices that can vary filament current? | show 🗑
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| Which device that varies filament current is a variable resistor? | show 🗑
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| T/F: When using a mA selector you are selecting mA. | show 🗑
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| What is it called when the exposure is made and all emitted e- are attracted to the anode? | show 🗑
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| T/F: when the tube is operating at lower kV levels, not all the emitted e- are attracted to the anode. | show 🗑
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| What is the space charge effect? | show 🗑
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| show | not all e- are boiled off are attracted to the target
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| show | true
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| show | *anode heel effect
*anode angle & area of IR coverage
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| What is the anode heel effect? | show 🗑
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| Smaller the target angle, __________ xray beam. | show 🗑
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| What is the disadvantage for smaller target angles when using larger IRs? | show 🗑
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| show | HU= kVp X mA X s
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| What is the equation solving for HU when using a 3 phase or high frequency machine? | show 🗑
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| show | false; the tube housing can tolerate a lot more heat than the anode.
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| What factors can affect tube rating? | show 🗑
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| What are some faults that can occur to the glass envelope? | show 🗑
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| show | vaporized tungsten condenses on inside of flass over the window; acts an additional filter this decreases the tubes ability to radiate heat.
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| show | from the weight of the anode or rough handling of the tube.
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| What is "crazy paving" of the anode? | show 🗑
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| show | decreases both
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| show | making heavy/rapid exposures on a cold anode (imbalance of the tube)
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Created by:
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