front 1 incoming line current | back 1 all xray equipment operates from an incoming line of 210-220 volt |
front 2 the main x ray circuit | back 2 must boost the voltage to the range necessary to produce x rays and to permit the radiographer to adjust the amperage, voltage and length of exposure. |
front 3 the main switch | back 3 are usually enclosed in an electrical power box |
front 4 the exposure switch | back 4 is simple connection that permit current to flow through the circuit. also activates the rotating anode of the x ray tube. The anode must be turning at a sufficiently high speed to avoid melting of the target by the high kilovoltage exposure. |
front 5 to aviod possibility of error | back 5 all xray unit that utilize rotating anode have circuitry that prevent an exposure until the anode is turning at the corret speed. |
front 6 what type od power does an xray generator supply? | back 6 AC electrical power |
front 7 How can a changing magnetic field produce a current? | back 7 by motion between a magnetic and a coil |
front 8 what type of coil does a single phase generator use? | back 8 a single coil (solenoid) |
front 9 what are single phase generator characterized by? | back 9 a production of a single wave that is sinusoidal varying voltage and circuit |
front 10 what happen to the induce current as the voltage fluctuates through each cycle in a single phase generator? | back 10 is also fluctuates |
front 11 when are xray produced in a single phase generator? | back 11 only during the positive half of the rotation. nothing is produced during the negative half |
front 12 at what frequency is AC generated in a single phase generator? | back 12 60 cycles/sec. or 60 Hz |
front 13 what is the ripple of the waveform of a single phase generator? | back 13 100% |
front 14 what is the least efficient way to produce x ray? | back 14 single phase generator |
front 15 what is the average energy for a single phase generator | back 15 70 KVp |
front 16 how does half wave single-phase generator operate? | back 16 it suppresses the negative half of the cycle to where it doesn't go below the 0 line, but nothing is being produced |
front 17 half wave single-phase | back 17 100% ripple
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front 18 how much cycle is available of x ray production on a HALF WAVE single-phase generator? | back 18 only one half of the cycle is available for x ray production |
front 19 when are x ray produced for the full wave single phase generator? | back 19 produce xray during both half of the AC cycle |
front 20 Full wave single phase | back 20 -It convert the negative wave to positive
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front 21 what can you do with a full wave single phase generator that you can't do with a half wave? | back 21 use a higher mA and KVp and shorter exposure time |
front 22 what do 3 phase generator produce? | back 22 full wave rectification the voltage never drop to zero |
front 23 three- phase, six pulse | back 23 -13-25% ripple (it means that the voltage in the xray tube never falls below
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front 24 what % more of x ray can be produced with a 3 phase generator vs. a single phase full wave generator? | back 24 12-16% more xray |
front 25 what is better for a 3 phase generator vs. a single generator | back 25 require less mAs that the single phase , high rating for mA and KVp ( can set technique higher) and exposure time are a short as 1 msec. to has more efficient x ray production |
front 26 what is the disadvantage of three phase generator vs. a single phase generator | back 26 contrast is less with the 3 phase generator because of the increase of KVp |
front 27 how does 3 phase 6 pulse generator produce its pulse per cycle? | back 27 produce 3 pulse every half cycle which is 6 pulse/ Hz, 360 /second. one pulse every 1/360 sec. getting faster and faster that the single phase |
front 28 3 phase 12 pulse generator | back 28 -4% ripple
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front 29 what is the newest development generator? | back 29 high frequency generator |
front 30 what does the high frequency generator use for voltage? | back 30 voltage with frequency higher that 60 AC cycle |
front 31 what does the high frequency generator ripple? | back 31 1% ripple
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front 32 what are the advantage of high frequency generator? | back 32 -compact unit
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front 33 what are falling load generator designed to produce? | back 33 designed to produce exposure in shorter posible time by setting the x ray tube begging at the highest mA setting and then allowing to fall during exposure ( without exceeding the heat loading capacity of the tube) |
front 34 what were falling load generators development primary for? | back 34 primary for use with AEC device (where there are not predetermined exposure time) |
front 35 What do falling load generator provide as far as mA and time? | back 35 the highest mA setting at the shortest time posible |
front 36 what cause the shortened tube life in the falling load generator? | back 36 use high mA and KV |
front 37 power | back 37 the unit of power is watt : V x A =W formula applies to 3 phase generator |
front 38 formula for single phase generator | back 38 V x A x 0.7 = W |
front 39 high frequency generator | back 39 use AC and DC power convert to change the incoming line voltage frequency from 60 Hz to the 6,000 Hz range. Work with a range of 500 to 25.000 Hz |
front 40 how does a capacitor discharged mobil unit work? | back 40 feed standard incoming line voltage to primary coil of high voltage transformer ; voltage across electrodo drop during exposure |
front 41 what is use to start and stop exposure for a capacitor discharge mobile unit | back 41 a grid controlled tube is usually used to act as a switch to start and stop exposure |
front 42 automatic exposure control (AEC) | back 42 provide correct exposure regardless of patient size, control the time of the exposure.
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front 43 an autotransformer function as a | back 43 KVp and mAs selector |
front 44 ripple measures | back 44 variation between maximina and minimum voltage
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front 45 the only radiation of any clinical values is: | back 45 the only radiation of any clinical values is:
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front 46 where is the exposure switch located? | back 46 primary side of the step up transformer |
front 47 where is the mA meter located? | back 47 in the secondary side of the step up transformer |
front 48 what is the typical amperage and voltage sent to the filament circuit? | back 48 3-6 A
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front 49 the transformer that has a single winding that acts as both the primary and secondary winding is called? | back 49 autotransformer |
front 50 a transformer with more turns in its primary winding that in the secondary would be expect to ? | back 50 decrease the voltage an increase the A Amperage ( step down transformer) |
front 51 which of the following circumstance would cause the backup timer to activate during the operation of an AEC unit? | back 51 a tabletop exam is being performer with the chest board select |
front 52 angiography unit | back 52 special unit 150 KVp |
front 53 capacitor discharge unit | back 53 provide an rms voltage significantly lower that the peak voltage |
front 54 battery operated movie unit | back 54 batteries supply nonpulsating direct current to a rotary converter, which provides current similar to 3 phase even greater frequency. compared to capacitor discharge machine this unit have the obvious advantage of 3 phase exposure constantly, higher rms voltage and no leakage. |
front 55 falling load generator | back 55 must be used with AECs. it begin exposure at the highest possible mA and then allowing to fall during exposure. it can short the X-ray tube life considerable.it leave the kvp under radiographer control. |
front 56 AEC | back 56 do not control any factor except time ` |
front 57 full capacity | back 57 is how height the wave go |