Term
"type of xray tube designed to turn on and off, making short exposures" |
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Definition
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Term
How will moving image intesifier closer to patient during fluoro affect patient dose? |
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Definition
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Term
how will moving image intesifier closer to patient during fluoro affect image quality? |
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Definition
Increase image quality due to decreased OID |
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Term
Batteries in mobile xray power what? |
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Definition
"xray tube, machine locamotion, braking mechanism" |
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Term
"Capacitor discharge, what does battery power?" |
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Definition
xray tube only. Must be recharged after each use |
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Term
electron cloud in xray tube is: |
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Definition
a product of thermal emission |
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Term
what causes pittiing and small melts on anode's focal track |
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Definition
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Term
photostimulable phospor plate is used for what? |
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Definition
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Term
where is step down transfromer located? |
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Definition
in secondary or high voltage side of xray circuit |
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Term
where is step up transformer located? |
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Definition
in primary or low voltage side of xray circuit |
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Term
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Definition
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Term
what target angle and focal spot size combination produces the greatest heat loading capabilities? |
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Definition
"small target angle, big actual focal spot size" |
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Term
"pinhole camera, star pattern, and slit camera are used to test what?" |
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Definition
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Term
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Definition
proportional. Vs/Vp=Ns/Np |
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Term
patient dose during fluoro is affected by |
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Definition
"distance between patient and input phosphor, amount of magnification, and tissue density" |
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Term
Spinning top test used to evaluate: |
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Definition
"timer acurracy, rectifier failure" |
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Term
rectifier failure will result in image of: |
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Definition
half of the dashes missing |
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Term
Will a smaller or larger diameter input screen improve spatial resolution |
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Definition
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Term
circuit device that permits electrons to flow in only one direction |
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Definition
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Term
What occurs during brems radiation? |
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Definition
electron approaching positive nuclear charge changes direction and loses energy |
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Term
what converst mechanical energy to electrical energy? |
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Definition
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Term
what converts electrical energy to mechanical energy? |
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Definition
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Term
terminates the x-ray exposure once IR is correctly exposed |
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Definition
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Term
star test pattern used to test? |
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Definition
focal spot size and magnification resolution |
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Term
whats diffeerence in mAs will be needed if using 3 phase 12 pulse equiptment instead of single phase |
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Definition
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Term
whats diffeerence in mAs will be needed if using 3 phase 6 pulse equiptment instead of single phase |
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Definition
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Term
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Definition
"readilly dissipates heat, high melting point, high atomic number" |
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Term
voltage ripple for 3 phase 6 pulse |
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Definition
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Term
voltage ripple for 3 phase 12 pulse |
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Definition
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Term
deposition of vaporized tungsten on inner surface of x-ray tube glass window: |
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Definition
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Term
What controls voltage by varying resistance |
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Definition
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Term
When using a smaller field in a dual field image intensifiers: is the image more magnfified? Brighter? |
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Definition
"It is more magnified, it is dimmer, and FOV is smaller" |
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Term
What is used in fluoro replacing image intensifier's television camera tube? |
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Definition
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Term
in which equipt does peak KVP decreases during exposure |
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Definition
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Term
Characteristics of xray tube |
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Definition
"target materal has high atomic number, cathode assembly receives both low and high voltages" |
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Term
device that directs light emitted from image intensifier to view aparatus |
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Definition
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Term
"when you select KVP on control panel, what device is adjusted" |
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Definition
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Term
what contributes to inherent filtration? |
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Definition
"xray tube glass window, xray tube port window" |
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Term
disadvantage of moving grid |
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Definition
"long exposure, increased patient dose. " |
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Term
double focus xray tubes have two: |
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Definition
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Term
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Definition
120 dashes/1 second on normal |
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Term
design characteristics of xray tube targets contribute to high heat capacity: |
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Definition
"fast rotation of anode, large diameter of anode, large size of focal spot" |
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Term
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Definition
"QF for three-phase high freq. 1.45, 12-pulse 1.41" |
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Term
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Definition
"QF for three-phase 6-pulse 1.35, single phase 1.0 " |
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Term
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Definition
"gadolinium, lanthunum, yrttium" |
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Term
star and wye configurations related to what? |
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Definition
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Term
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Definition
inversely proportional Ip/Is = Ns/Np |
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Term
capacitor-discharge mobile |
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Definition
"grid controlled tube, provides direct-current output" |
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Term
which image intensifier mode will yield highest patient dose |
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Definition
small diameter because it will be dim and will require increase in mAs |
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Term
advantage of collimator over diaphram and cones |
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Definition
"varying field size, more efficient beam restriction. But does not clean up more scatter" |
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Term
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Definition
phototimer charged by flourscent screen behind IR or ionization chamber in front of cassette |
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Term
Increased in heat of filament results in : |
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Definition
"more electrons released, thus more mAs" |
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