xray circuit

primary, secondary, filament

3 primary sections of the xray circuit

primary circuit

consists of the main power switch (connected to
the incoming power supply), circuit breakers, the autotransformer, the timer circuit, and the primary side of the step-up transformer

secondary circuit

consists of the secondary side of the step-up
transformer, the mA meter, a rectifier bank, and the x-ray tube (except
for the filaments).

filament circuit

a rheostat, a step-down transformer, and the filaments

main power switch

simply an on-off switch for the unit and is connected to the power supply of the facility

line compensator

wired autotransformer that automatically adjusts the power supply to keep it at 220 volts

circuit breaker

protects against short circuits and electric shock

autotranformer

adjustable transformer controlled by the kVp selector on the operation console

step-up transformer

used to increase the voltage from the autotransformer to the kilovoltage necessary for xray production 

step-up transformer

this is the divivding line between the primary and secondary circuit

timer circuit

exposure timer that makes it easier to control a low voltage than and very on

secondary circuit

consists of the secondary side of the step-up transformer, the mA meter, a rectifier bank, and the x-ray tube (except for the filaments)

filament circuit

consists of a rheostat, a step-down transformer, and the filaments.

mA meter

a device placed in the secondary circuit that monitors x-ray tube current

rectifiers

converts ac to dc in the secondary unit

anode to cathode

in the xray tube current must flow from….

solid state rectifier

rectifier commonly used in todays xray circuit that is made of 2 semi conducting crystals (p-type and n-type)

rheostat

begins the filament circuit and is controlled by the mA selector

mA

“tube current” that reflects the rate of flow of electrons passing through the xray tube during an exposure

exposure timer

works in concert with the rheostat

rheostat

controls filament temperate and the rate at which electrons are boiled off of the filament

exposure timer

determines the duration of the rheostat

together these two determine the quantity of electrons boiled off of the filament 

step-down transformer

used in the filament circuit to increase the current by reducing the voltage that is applied to the filament

filaments

the final piece of the filament circuit

small focal spot

there are 2 filaments one signifying a large focal spot and a

boil off electrons

the goal of the filament circuit is to ….. out of the filament wire

5-7

a large filament current of …. amps is required to produce a tube current in the range of milliampres

thermionically emitted electrons

…. are needed for xray production and represent one more step in our manipulation of electricity 

filament circuit

in this circuit we are boiling off electrons off a very small wire and must precisely control the current that is applied

damaged

if the current is too high on the small wire of the filament circuit, the tiny wire will be

kVp

this adjusts the autotransformer and determines the number of turns on the secondary side necessary to produce a voltage throught self induction

step up….mutual induction

the …. transformer increases this voltage by a fixed amount and
through ….. produces the kilovoltage selected on the
operating console

solid state rectifiers

used to route electricity through the xray tube correctly

technique

the process begins when the radiographer selects a

anode, cathode

After passing through the rectifiers, the electricity creates a large
positive charge on the ….. of the x-ray tube and a large negative
charge on the ….. focusing cup

filament circuit, rheostat

the ……. draws electricity from the autotransformer, which then travels to the …..

step down transformer

from the rheostat, electricity then travels to the

filament

the adjusted current from the step down transformer then travels directly to the …. 

focusing cup

the filament is located with in the

boiled off

the filament heats up to the point where the electrons are boiled off

cloud of electrons

the filament circuit creates a

anode, cathode

the kilovoltage applied to the xray tube created a large positive charge on the …. and a large negative charge on the ….

kinetic energy

the large positive change attracts the electrons boiled off, giving them

crowded together

the large negative charge on the cathode serves to keep the electrons…

timer circuit

The electrons travel across to the anode and interact there to produce x-rays until the …. terminates the process