Imaging unit 1 X-ray circuitry

Question 0

3 main circuits

Answer 0

Primary/low
Secondary/high
Filament

Question 1

How electricity gets from outside to inside hospital

Answer 1

Electric co supplies high V to step down trans on pole outside hospital
V is stepped down to 120-240 called line voltage
Insulated wires bring electricity to inside
Wires go to breaker box(main switch)
Wires go from breaker box to control panel where tech can control

Question 2

Primary circuit and it’s components

Answer 2

Breaker box to primary coil of step up transformer
Most components located in and around the control console

Main switch, fuses, control panel, auto transformer, per reading kV meter, line voltage compensator, exposure switch, circuit breaker, and primary coil of high V transformer

Question 3

Main switch

Answer 3

Completes or breaks the connection

Question 4

Fuses

Answer 4

Protective e devices added to wires leading from main switch

Protects equipment and reduces fire hazards

Question 5

Control panel

Answer 5

Displays all meters,knobs, to control X-ray production

Tech controls

Question 6

Autotransformer — purpose and what technique it helps

Answer 6

kV selector
Varies voltage going to primary coil of step up
Principle of self induction
Can be step up or step down 
Helps with kV

Question 7

Per reading kV meter

Answer 7

AC voltmeter
Connected parallel
Allows kV to be monitored b/f exposure
Btwn auto and step up

Tells what kV will be in secondary circuit

Question 8

Line voltage compensator

Answer 8

Senses changes coming to primary circuit

Can vary number of turns on primary side of auto

Question 9

Exposure switch

Answer 9

Btwn auto and step up
Depress half way- readys tube for exposure
Depress completely- completes connection, electrons burnt off and racing across tube
Starts exposure but timer stops it

Question 10

Circuit breaker

Answer 10

Connected with exposure switch and timer
Can easily reset if tripped
Protects against overloading

Question 11

Primary coil of high V

Answer 11

Creates the moving magnetic field that induces current to flow in secondary coil
Increases voltage to kV level

Question 12

Secondary high voltage circuit— location, function and list components

Answer 12

Located in oil insulated transformer unit
Creates the moving magnetic field

Converts low V to kV
Converts AC to DC

Secondary coil of step up, mA meter, rectifier and tube and cables

Question 13

Step up transformer

Answer 13

Supplies tube with high enough V to drive e’s across tube

Question 14

Other names for step up transformer

Does what to V and amps

Answer 14

High V trans, high tension trans and main trans

Increase V and decreases amps

Question 15

mA meter

Answer 15

Measures electron flow in secondary circuit, tube current

Question 16

Rectifier

Answer 16

Converts AC to DC
Prevents back flow of e’s
Located btwn tube and step up

Question 17

Tube

Answer 17

Where X-rays are made, source of X-rays is the anode, cathode is source of e’s

Question 18

Filament circuit —- function and components

Answer 18

Supplies heating current for filament

Receives incoming AC from primary circuit at autotransformer

Question 19

Step down transformer

Answer 19

Decreases V’s and increases amps

Provides the amps to the filament

Question 20

mA selector/resistors —- other names and fctn

Answer 20

Rheostats, high frequency, saturable reactors
Hinders flow of current through conductors
Controls the current

Question 21

Filament ammeter

Answer 21

Measures the filament circuit

Located btwn resistor and filament transformer

Question 22

Timing circuit

Answer 22

Controls the duration of the exposure

Question 23

Tube current

Answer 23

Amt of e’s traveling across tube from cathode to anode

Question 24

Devices that measure filament circuit? Secondary circuit?

Answer 24

Ammeter

Milliammeter

Question 25

What device tells what kV will be in secondary circuit?

Answer 25

Prereading kV meter