Xray Circuit

part of the x-ray circuit that contains the kvp selector, kvp meter, exposure timer and exposure switch

primary side/circuit

part of the x-ray circut that contains the mA selector, focal spot selector and step-down transformer

filament circuit

part of the x-ray circuit that contains the mA meter and rectifiers

secondary side/circuit

adjusts autotransformer to deliver precisely 220 volts

line voltage compensator

supplies a precise voltage to the high voltage circuit

autotransformer

reads the voltage that will be applied to the secondary side of the step up transformer

kVp meter

filament uses this current

3 to 6 A

this is what happens to current when voltage is increased

decreased

this is what happens to voltage when current is increased

decreased

type of timer that has a minimum exposure time of 1/60 s and has to be reset each time exposure is made

synchronous

type of timer that is the most accurate but also most sophisticated and complicated

electronic

type of timer that monitors the product of mA and exposure time and terminates the exposure when desired mAs value is attained; used on falling load imaging systems

mAs

type of timer that measures the quantity of radiation reaching the image receptor and terminates the exposure when the image receptor has received enough radiation to provide the required optical density

AEC

most commonly used AEC

ionization chamber

type of rectifiers used in x-ray imaging systems today

solid-state

if positive charge is applied to the n side of the solid state rectifier then electrons____ flow

will not

if negative charge is applied to the n side of the solid state rectifier then electrons _____ flow

will

number of rectifiers used in half-wave rectification

two

number of rectifiers used in full-wave rectification

four

number of pulses per second with half wave rectification

60

number of pulses per second with full wave rectification

120

number of pulses per second with three phase power (non rectified/6 pulse)

360

number of pulses per second with three phase power (rectified/12 pulse)

720

type of generator that generates high voltage, full-wave rectified power to a higher frequency (usually 500-25,000 Hz)

high-frequency

type of generator used in portable machines

high-frequency

type of generator that builds up a charge then releases it with completion of the circuit

capacitor-discharge

type of generator that is used to provide the highest mA setting at the shortest possible times where the computer will automatically calibrate the time of the exposure allowing consistently shorter exposures

falling-load generator

voltage ripple percent for single phase half wave rectified units

one hundred

voltage ripple percent for single phase full wave rectified units

one hundred

voltage ripple percent for three phase, six pulse units

thirteen

voltage ripple percent for three phase, twelve pulse units

four

voltage ripple percent for three phase, high frequency units

less than 1

X-ray production efficiency ______ with an increase in voltage ripple

decreases

High frequency generators cost _____ than single phase generators

more

multiplying mA and kVp then dividing by 1000 is the equation for power rating for _______.

three phase and high frequency

multiplying 0.7, mA, and kVp then dividing by 1000 is the equation for power rating for _____.

single phase units