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RADT 334- UNIT 3

A material that can conduct an electric current or not, depending on the voltage applied across that material. semiconductor
An electronic device designed to terminate x-ray exposure after properly exposing an image receptor. AEC
A method of adjusting the voltage to the x-ray imaging system to a constant value, in response to changes in voltage supplied by the power company. line compensation
An electrical circuit device that stores electric charge. capacitor
Place in the tube circuit, connected at the center of the secondary winding of the high-voltage step-up transformer in series with the x-ray tube. This reduces the possibility of shock. mA meter location
An electrical device that contains two electrodes. diode
The fluctuation in the voltage applied to the x-ray tube expressed as a percentage of peak kilovoltage. voltage ripple
The process of changing alternating current and voltage into direct current and voltage. rectification
A type of transformer having a single winding. autotransformer
The product of voltage and current; Watt. power
220 V is supplied across 1200 windings of the primary coil of the autotransformer. If 1650 windings are tapped, what voltage will be supplied to the primary coil of the high-voltage transformer? 302.5 V
A kVp meter reads 86 kVp and the turns ratio of the high-voltage step-up transformer is 1200. What is the true voltage across the meter? 71.7 volt peak
The supply voltage from the autotransformer to the filament transformer is 60 V. If the turns ratio of the filament transformer is 1/12, what is the filament voltage? 5 V
If the current in the primary of the filament transformer was 0.5 A with a turns ratio of 1/12, what would be the filament current? 6 amps
The supply to a high-voltage step-up transformer with a turns ratio of 550 is 190 V. What is the voltage across the x-ray tube? 104.5 kV
Allows relatively undiminished intensity of x-rays through the tabletop. 90/20 table
List the 5 major controls on the operator's console. On/off control, kVp selection, mAs selection, time (mAs) selection, and automatic-exposure controls.
Purpose of the autotransformers. to vary and control the amplitude of the voltage supplied to the high-voltage step-up transformer and the filament transformer.
Primary/secondary voltage relationship in autotransformers. Direct relation to the number of turns of the transformer.
What the prereading kVp meter allows. The precise adjustment of the supply voltage and monitoring the kVp before the x-ray exposure.
200 mA and 1/60 of a second equals what mAs? 3.3
600 mA and 30 milliseconds equals what mAs? 18
What is the difference between high voltage transformer and high voltage generator? The high-voltage transformer is just one component of a high-voltage generator.
In order that a reverse voltage is not applied across the x-ray tube and that the tube operates most efficiently, x-ray tubes use ____ current. direct
Direct current is archived in the x-ray circuit through? rectification
Voltage ripple of single-phase generator. 100%
Voltage ripple of three-phase, six-pulse generator. 14%
Voltage ripple of three-phase, twelve-pulse generator. 4%
Voltage ripple of high-frequency generator. 1%
0.7(mA)(kVp)/1000 is the equation for computing _____ power rating. single-phase
(mA)(kVp)/1000 is the equation for computing ____ or ____ power ratings. three-phase, high-frequency
Graph showing the cooling rate of an x-ray tube housing. housing cooling chart
Radiation emitted through the x-ray tube housing (other than the primary beam). leakage radiation
Measure of heat capacity (1HU=1AVs=1Ws=1J). heat unit
Shroud inside the x-ray tube surrounding the cathode to concentrate electrons on the focal spot. focusing cup
Anode rotation speed. 3400 rpm or 10,000 rpm
Tungsten alloyed with thorium. Thoriated tungsten
Cathode to anode electron flow. x-ray tube current
X-ray tube capable of high speed switching. Voltage applied to the focusing cup is the switch. grid-controlled x-ray tube
Method of heat transfer by a moving fluid medium(liquid or gas). convection
Electron cloud in the vicinity of the filament. space charge.
Three methods used to support the x-ray tube. Floor, wall, or ceiling mounted.
Where thoriated tungsten would be used in a x-ray imaging system. cathode and anode
When all available electrons are projected from the cathode to the anode. saturation current
Why are arcing and tube failure no longer a problem in modern x-ray tube design? heavy filaments and high capacity anodes
Pass an electric current to heat a conductor and cause outer-shell electrons to be released from the conductor. thermionic emission
Principal cause of tube failure. broken filament
What addition to the filament material prolongs tube life? thorium
Why is the filament embedded in the focusing cup? To electrostatically shape the beam
Why would an x-ray tube need a large focal spot? high intensity radiation
Why would an x-ray tube need a small focal spot? better spatial resolution
Negative side of the x-ray tube. cathode
positive side of the x-ray tube anode
Name 2 types of anodes. Fixed and rotating
Three functions of the anode. X-ray tube target, electrical and thermal conductor, and mechanical support.
How does atomic number affect the selection of anode target materials? high atomic number=efficient x-ray production.
How does thermal conductivity affect the selection of anode target material? thermal conductivity=heat dissipation
How does melting point affect the selection of anode target material? melting point=heat capacity
How does the anode rotate inside a glass enclosure with no mechanical connection to the outside? induction motor
Higher x-ray intensity on the cathode side. Anode heel effect
How can anode heel effect be used advantageously? positioning thicker anatomy on cathode side
Name three causes of tube failure. cracked or pitted anode, induction motor failure, and open filament.
How can space charge be removed? increase kVp
X-ray tube locking-in at center and at a given SID. detent position
a material that transmits x-rays and appears dark on a radiograph. radiolucent
Created by: 1438932103
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