1130 #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 | kVp and mA
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| show | positioning
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| When more than 1 cell is activated, the cell recieving the most radiation will contribute the ________ electrical signal and therefore have the ________ influence on the overall exposure. | show 🗑
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| If 3 cells are sctivated during a BE so that the barium was over 1 cell and normal tissue was over the other 2 cells, the resultant image would be? | show 🗑
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| show | underexposed
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| show | no, it won't do any good
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| When should the technologist use the density control? | show 🗑
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| ___________ _________ collimation skills result is an increase repeat rate when using AEC? | show 🗑
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| A proper ___________ __________ can reduce the number of repeated images and produce excellent images? | show 🗑
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| show | not over collimate
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| show | TOo dark
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| The back-up timer should always be set at ______% of the anticipated manual exposure time? | show 🗑
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| show | yes
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| show | decreased
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| If a pt with a large consolidated pneumonia of the right and middle lobes. In the order to obain an image that evaluated the entire thorax, the _____ detector should be activated? | show 🗑
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| If the patient has a left pneumectomy, the _______ detectors should be activated | show 🗑
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| The cathode is on the _____ side? | show 🗑
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| show | cathode (x-ray ciruit)
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| What material is the filament made out of? | show 🗑
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| By increasing what factor will increase the number of electrons boiled off by the filament? | show 🗑
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| show | 1.0-3.0 mm
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| show | Better detail
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| show | Have to use lower mA, limit size of primary beam field at a short SID
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| What is the function of the filament? | show 🗑
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| What amperage is neccessary for thermionic emission? | show 🗑
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| What is the purpose of the focusing cup? | show 🗑
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| show | Primary thermal conductor, serves as a target for high voltage electrons, conduct high voltage from cathode back to x-ray generator
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| What is the purpose of the rotating anode? | show 🗑
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| show | tungsten
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| show | high melting point, high atomic #, heat conducting ability
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| show | will vaporize enough target focal track material to pit the target
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| Small target angle limits the size of the primary beam when used with? | show 🗑
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| Describe the target area? | show 🗑
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| How does the target area related to SID? | show 🗑
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| show | kinetic energy
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| show | 12 degrees
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| Diagnostic tube gave focal spots of ____mm to ___mm? | show 🗑
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| Due to the anode heel effect, how much total variance in the number of photons can occur? | show 🗑
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| Describe why the anode heel effect is a problem? | show 🗑
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| show | Thicker part on cathode end
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| What is the stator function? | show 🗑
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| Where is the stator located? | show 🗑
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| What is the rotor's function? | show 🗑
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| What problem indicates a grinding noise in the x-ray tube? | show 🗑
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| show | houses entire cathode and anode assembly. Keeps the vacuum
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| What is the window? | show 🗑
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| What is the protective housing's function? | show 🗑
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| Leakage radioation must not exceed ____ mR/hour at _____ meter? | show 🗑
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| Within the tube, space charge refers to? | show 🗑
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| What is off focus radioation? | show 🗑
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| show | 25-30%
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| How are tube rating charts used? | show 🗑
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| show | 0.78 joules
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| show | kVp x mA X time X recitification constant. Single 1.00, 3 1.35, high 1.40
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| Know how to use cooling charts | show 🗑
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| show | braking or slowing
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| show | Interacts w/ the force field of the nucleus
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| In Characteristic radiation, the incident electron is? | show 🗑
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| What shell do electrons drop into to produce characteristic photons in the diagnostic range? | show 🗑
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| What kVp is required for Characteristic Radiation? | show 🗑
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| What interactions make up the majority of the primary beam? | show 🗑
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| show | keV energy of only 30-40% of kVp
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| show | kVp
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| Name the factor that affects amplitude on the emission spectrum? | show 🗑
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| show | 60
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| Type of current in the US Volts? | show 🗑
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| show | constant fluxuation (in volts)
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| show | low voltage
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| Describe a 3 phase generator? | show 🗑
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| show |
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| show | 3-5 and 6-12 volts
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| show |
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| Electronis timers? | show 🗑
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| show | 3-5 ampes and 6-12 volts
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| show | full wave rectification 120 pps 100% ripple 70.7% rms (peak voltage) voltage drops to 0 twice per cycle
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| 3 phase, 6 pulse? | show 🗑
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| show | 720 pps 4-10% ripple 90-96% rms (peak voltage) kVp never drops below 90-96%
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| show | P=v x amp
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| What are hight frequency generators? | show 🗑
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| show | supplies AC current, mobile with recharging capabilities
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| Ionization chambers? | show 🗑
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| How many ionizaion chambers are used? | show 🗑
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| What is the minimum reation time for most ionization chambers? | show 🗑
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| What is the function of the back-up timer? | show 🗑
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| What should the back-up timer be set at ______% for an anticipated manual exposure mAs? | show 🗑
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| show | time
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| show | radiaion detection that produces small electrical current when struck by radiation
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| show |
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| AEC devices automatically terminate an exposure after a predeterined amount of? | show 🗑
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| show | center cell
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