Term
| the coiled tungsten wire that is the source of electrons during x-ray production is called... |
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Definition
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Term
| the revolutions per minute of the rotating anode is... |
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Definition
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Term
| tungsten is used in the target because it has... |
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Definition
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Term
| the physical area of the target that is being bombarded with electrons during x-ray production is... |
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Definition
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Term
| the radiation that results when projectile electrons interact with the K-shell electrons of tungsten on the anode is called |
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Definition
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Term
| electron flow from cathode to anode in the xray tube is called... |
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Definition
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Term
| the portion of the x-ray circuit that operates on 3 to 5 amps and about 10 volts is called the... |
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Definition
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Term
| beam penetrability increases as... |
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Definition
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Term
| the exposure factor that produces or controls the number of x-rays is... |
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Definition
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Term
| the anode angle typically ranges from... |
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Definition
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Term
| thicker anatomic parts should be positioned at the... |
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Definition
| cathode end of the x-ray tube |
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Term
| total filtration for x-ray tubes operating above 70 kVp in the United States is... |
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Definition
| 2.5mm of aluminum or its equivalent |
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Term
| failure of the rotor to rotate the anode will cause... |
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Definition
| melting of the focal tract |
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Term
| which x-ray tube component serves as a source of electrons for x-ray production? |
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Definition
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Term
| electrons interact with the ____ to produce x-rays and heat? |
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Definition
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Term
| the cloud of electrons that forms before x-ray production is referred to as... |
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Definition
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Term
| the burning or boiling of electrons at the cathode is referred to as... |
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Definition
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Term
| which primary exposure factor influences both the quantity and the quality of x-ray photons? |
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Definition
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Term
| the unit used to express tube current is... |
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Definition
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Term
| what percentage of the kinetic energy is converted to heat when moving electrons strike the anode target? |
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Definition
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Term
| the intensity of the x-ray beam is greater on what side of the tube? |
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Definition
| the cathode side of the tube |
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Term
| according to the line focus principle, as the target angle decreases, the _____ increases/decreases? |
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Definition
| effective focal spot size decreases |
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Term
| _________ extends x-ray tube life |
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Definition
| warming up the tube after 2 hours of nonuse |
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Term
| which type of target interaction is responsible for most of the x-rays in the diagnostic beam? |
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Definition
| bremsstrahlung interaction |
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Term
| how much mAs is produced when the radiographer sets 70 kVp, 600 mA, and 50 ms? |
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Definition
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Term
| increasing the kVp results in... |
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Definition
| x-rays with higher energy and more x-rays |
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Term
| total filtration in the x-ray beam includes... |
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Definition
| inherent and added filtration |
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Term
| how many heat units result from an exposure made on a single-phase x-ray unit using 400 mA, 0.2 second, and 70 kVp? |
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Definition
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Term
| mathematical calculation to find HU |
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Definition
| mA x time x kVp x generator factor |
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Term
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Definition
single phase- 1.00
three phase- 1.35
high frequency- 1.40 |
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Term
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Definition
heat unit
the amount of heat produced from any given exposure |
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Term
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Definition
can be added to primary beam to alter it's intensity.
wedge filter (think of foot)
trough filter (think of body trunk and vertebrae needing less to be able to penetrate fully) |
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Term
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Definition
| the amount of filtration that reduces the intensity of the x-ray beam to one-half it's original value, is considered the best method for describing x-ray quality. |
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Term
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Definition
| as an indirect measure of the total filtration in the path of the x-ray beam. expressed in mm of aluminum (mm-Al) |
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Term
| what is the primary purpose of HVL |
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Definition
| to ensure that the total filtration in the x-ray tube is adequate to protect patients from unnecessary low-energy radiation |
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Term
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Definition
| the filtration that is added to the port of the x-ray tube (aluminum) |
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Term
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Definition
filtration that is permanently in the path of the x-ray beam
the envelope of the tube
the oil that surrounds the tube
the window in the tube housing |
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Term
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Definition
| occurs because of the angle of the target. describes how the x-ray beam has greater intensity (# of x-rays) on the cathode side of the tube. can be as much as 45% more |
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