Xray Circuits

Question 1

Main power switch, circuit breakers, the
autotransformer, the timer circuit, primary side of the step-up transformer

Answer 1

Primary Circuit

Question 2

Secondary side of the step-up transformer, the milliampere meter, a rectifier bank, and the xray tube (except for the filaments)

Answer 2

Secondary Circuit

Question 3

Rheostat, step-down transformer, the
filaments

Answer 3

Filament Circuit

Question 4

General xray circuit

Answer 4

Primary Circuit
Secondary Circuit
Filament Circuit

Question 5

The _____ incorporates a meter to measure the voltage provided to the x- ray machine and a control to adjust that voltage to precisely 220 volts.

Answer 5

line compensator

Question 6

Included in the primary circuit to protect
against short circuits and electric shock

Answer 6

Circuit Breakers

Question 7

Is an adjustable transformer controlled by the kVp selector on the operating console

Answer 7

Autotransformer

Question 8

Automatically terminates the exposure
when sufficient radiation to provide the required optical density has reached the image receptor.

Answer 8

Automatic Exposure control

Question 9

Device that measures the quantity of
radiation reaching the image receptor.

Answer 9

Phototimer

Question 10

2 types of Phototimer

Answer 10

 Photomultiplier tube
 Ionization chamber

Question 11

Method used to check the accuracy of exposure timer

Answer 11

Spinning Top Test

Question 12

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

Answer 12

mA meter

Question 13

Solid-state rectifiers are commonly used

Answer 13

Rectifiers

Question 14

is responsible for converting the low voltage from the electric power company into a kilovoltage of proper waveform.

Answer 14

High-Voltage Generator

Question 15

High-voltage generator contains the following three primary parts.:

Answer 15

 High-voltage transformer
 Filament transformer
 rectifiers

Question 16

 Is a step-up transformer. The secondary voltage is greater than the primary voltage because the number of secondary windings is greater than the number of primary windings.

Answer 16

High Voltage-transformer

Question 17

The ratio of the number of secondary
windings to the number of primary windings.

Answer 17

Turns Ratio

Question 18

 Used to increase the voltage from the
autotransformer to the kilovoltage
necessary for x-ray production.
 Not adjustable and increases the voltage
from the autotransformer by a fixed
amount.

Answer 18

Step-up Transformer

Question 19

 Consists of mechanical and electronic devices whose action is to “make” and “break” the high voltage across the x-ray tube.

Answer 19

Timer Circuit

Question 20

 Cause the x-ray tube to emit x-rays for a specific time as determined by the radiographer or by AEC (Automatic Exposure Control).
 Controls the length of exposure

Answer 20

Exposure Timers

Question 21

 Simple devices use in some portable and dental units
 Operates by clockwork
 Inexpensive but not very accurate
 Exposure times greater than 250 ms

Answer 21

Mechanical Timers

Question 22

 Minimum exposure time possible 1/60 second

Answer 22

Synchronous Timers

Question 23

 Most sophisticated, most complicated, most accurate
 Used for rapid serial exposures
 Exposure time as small as 1 ms
 Wide range of time intervals
 Based on the time it takes to charge a
capacitor through a variable resistor

Answer 23

Electronic Timers

Question 24

 Designed for accurate control of tube current and exposure time
 Terminates the exposure once desired mAs is attained
 Located in the secondary circuit

Answer 24

mAs Timers

Question 25

 Is the process of converting alternating voltage to direct voltage and therefor alternating current to direct current.

Answer 25

Rectification

Question 26

Property of an x-ray tube which means
that it acts as a valve permitting the flow of current in only one direction, from the cathode to the anode.

Answer 26

Self-rectification

Question 27

 Represents condition in which the voltage is not allowed to swing negatively during the negative half of its cycle.
 Contain zero, one, or two diode
 X-ray output is pulsating, with 60 x-ray pulses per second

Answer 27

Half-wave Rectification