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the x-ray imaging system has three principal sections,what are they ?
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the operating consoles consits of what ?
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x-ray imaging system
chapter 6 bushong lmr
| Question | Answer |
|---|---|
| the x-ray imaging system has three principal sections,what are they ? | 1: the x-ray tube 2: the operating console 3: the high-voltage generator |
| the operating consoles consits of what ? | 1: an on and off control. 2: controls to select kVp, mA, and time or mAs. 3: AEC |
| the high-voltage generator provides power to the x-ray tube in three possilbe ways, what are they ? | 1: single phase power 2: three phase power 3: high-frequency power |
| what is the diffance between single and three phase power? | the manner in which the high-voltage step-up transformer is electrilly positioned |
| what phase power is the voltage across the x-ray tube is nearly constant during exposure and never drops to zero ? | three-phase power |
| the components of an x-ray imaging system is sometimes identified by there power rating in what? | kilowatts (kW) |
| the operating console is used for what ? | 1: control the voltage applied to the x-ray tube. 2: the current through the x-ray tube. 3: the exposure time. |
| the high-voltage generator contains what ? | the high-voltage step-up transformer, the rectification circuit and filament transformer. |
| differant types of x-ray imaging systems are usually identified by what ? | identified according to the energy of the x-rays they produce or the purpose for which those x-rays are intended. |
| there are many different diagnostic imaging systems , these systems operate at voltage of __ to __ kvp and tube currents of __ to __ mA. | 25 to 150 kVp 100 to 1200 mA |
| a fluoroscopic table is identified by what and located where? | the degree of the head and foot tilt and is located under the examination table. |
| what are the advantage of carbon fiber table tops ? | they are strong and absorb little x-radiation that will reduce patient dose. |
| name the 5 types of timing circuits | 1: mechanical 2: synchronus 3: mAs 4: AEC 5: electronic |
| what has a single winding and is designed to supply a precise voltage to the filament circuit and to the high- voltage circuit of the x-ray imaging system? | autotransformer |
| what determines the quality of the x-ray beam ? | kVp |
| what is the release of electrons from a heated filament? | thermionic emission |
| the poduct of x-ray tube current (mA) and exposure (s) is mAs, which is also called what ? | electrostatic charge (C) |
| what are used on falling-load and capacitor discharge imaging systems? | mAs timers |
| what is the process of converting AC to DC ? | rectifiers (rectification ) |
| what is used when medical imaging systems are described ? | electron flow |
| less voltage ripple results in ____ radiation quanity and quality. | greater |
| during capacitor discharge, the voltage falls approximately ? | 1 kV/mAs |
| high -voltage generators power (kW) = maximum x-ray tube current (mA) at __ kVp and __ ms. | 100kVp 100ms |
| power = | current x potential |
| watts = | amperes x volts |
| power rating (kW) = mA x kVp / 1000 | equation for three phase and high-frequency power |
| single phase power equation | power rating (kW) = (0.7) mA x kVp / 1000 |
| what is the votage ripple for a single-phase power ? | 100% voltage |
| what is the voltage ripple for a three-phase, twelve-pulse power ? | 4% voltage |
| what is the ripple voltage for a three-phase , six-pulse power? | 14% voltage |
| what is the ripple power for a high frequency generator ? | 1% voltage |
| ___ ___ rectification or __ ___ voltage generators is used in almost all stationary x-ray imaging system. | full-wave rectification and high-frequency voltage |
| fluoro x-ray tubes are usually located where ? | under the table |
| the radiographic x-ray tube is attached to what ? | an overhead movable crane. |
| a patient supporting examination table is required to be __ or __ but must be uniform in __ and __ to x-rays. | flat or curved. thickness and transparent |
| if the table is used for fluoro where should the tray be located ? | the tray must be moved to the foot of the table and the opening must be shielded from radiation ? |
| what do you use for protection of the opening of the tray, on the fluoro table from radiation ? | bucky slot cover |
| where are the high voltage generator housed? | in a cabinet positioned against the wall |
| the high voltage generator is always close to what ? | the x-ray tube |
| the part most familiar to a rad tech is what ? | operating console |
| all electric circuits that connect the meters and controls on the console are at low __ to minimize __ __ | low voltage and hazardous shock |
| the x-ray tube is attached to what? | an overhead movable crane. |
| where is the x-ray tube located? | in the examination room. |
| where is the console is located? | in an adjoining room with a protective barrier. |
| where is the high voltage generator located? | it may be housed in an equipment cabinet positioned against the wall. |
| the operating console allows the radiologic tech to control what? | tube current and voltage, so the useful x-ray beam is for proper quantity and quality |
| the operating console provides what? | controls of line comp ensation , kVp , mA, and exposure time. |
| the electric circuits that connect the meters and controls on the operating consoles are at what voltage and minimizes what ? | Low voltage and minimize hazardous shock |
| x-ray imaging systems are designed to operate on what power? | 220 V |
| what measures and adjusts the voltage to preciselyn 200 V? | line compensator |
| the power supplied to the x-ray system is delivered first to what? | autotransformer |
| the autotransformer works on the principle of what? | electromagnectic induction |
| what has a number of connection along its length? | The single winding |
| what conduct the input power to the autotransformer? | primary connection |
| the autotransformer is designed to do what ? | step up voltage to approx. twice the input value |
| the autotransformer law is the same as what? | the transformer law |
| what does the minor kilovolt peak adjust ? | ( fine tunes ) the selected technique |
| the kVp meter is placed across what and reads what ? | the output terminals of the autotransformer and reads voltage |
| the kvp meter that is across the output terminals of the autotransformer is called what ? | prereading kvp |
| the kvp prereading allows what ? | the voltage to be monitored before exposure |
| the tube current, crossing from cathode to anode in measured in what? | mA |
| the number of electrons emitted by the filament is determined by what? | the temperature of the filament |
| filaments operates at current of what ? | 3 to 6 amperes |
| x-ray tube current is controlled through separte circuit called what ? | filament circuit |
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lrodriguez294
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