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