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x-ray imaging system

chapter 6 bushong lmr

QuestionAnswer
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
Created by: lrodriguez294
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