The X-ray Unit/Imaging System Flashcards

1
Q

it is used to provide controlled flow of electrons that it is intense enough to produce x-ray beam

A

x-ray unit or imaging system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

three components of xray unit

A

operating console
high voltage generator
xray tube

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

it is the part of the xray machine most familiar to the radiographer

A

operating console

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

the number of xrays; mR or mR per mAs

A

quantity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

it is the penetrating quality of xray beam kVp or half value layer

A

quality

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

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

A

line compensation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

it is designed to supply a precise voltage to the filament circuit and to the high voltage circuit of the xray machine

A

autotransformer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

some older xray operating consoles have labelled major and minor kvp by selecting a combination of these controls, the radiographer can provide precisely the required kvp

A

kvp adjustment

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

it allows the voltage to be monitored before an exposure

A

prereading kvp meter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

it is where the number of electrons emitted by the filament is determined by the temperature of the filament

A

mA control

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

as filament current increases, the filament becomes ___ and more electrons are released by _____ emission

A

as filament current increases, the filament becomes hotter and more electrons are released by thermionic emission

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

filament normally operates at the current between __ to __ amperes

A

filament normally operates at the current between 3 to 6 amperes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

it causes the x-ray tube to emit for a specific time as determined by the radiographer or by an automatic exposure control

A

exposure timers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

five types of timing circuits

A

mechanical timer
synchronous timer
electronic timer
mAs timer
automatic exposure controls

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

it is a timing circuit that are very simple devices used only in some portable and dental units and it operates by a clockwork

A

mechanical timer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

it is a timing circuit that is a special type of electronic motor and is a precision device designed to drive a shaft at precisely 60 revolutions per seonds

A

synchronous timer

17
Q

it is a timing circuit that are the most sophisticated, most complicated and most accurate of the x-ray exposure timers

A

electronic timer

18
Q

it is a timing circuit that most xray apparatus is designed for accurate control of tube current and exposure time

19
Q

it is a timing circuit that it automatically terminates the exposure when sufficient radiation to provide the required optical density has reached the image receptor

A

automatic exposure controls

20
Q

this evaluates the length of time that the xrays produces

A

evaluation timer

21
Q

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

A

high voltage generator

22
Q

it is a step up transformer where the secondary voltage is higher than the primary voltage

A

high voltage transformer

23
Q

what do you call a ratio of the number of secondary windings to the number of primary windings?

A

turn ratio

24
Q

is the process of converting alternating voltage into direct voltage and therefore alternating current into direct current

A

rectification

25
represents a condition in which the voltage is not allowed to swing negatively during the negatively half of its cycle
half wave rectification
26
in a full wave rectified circuit the negative half cycle corresponding to the inverse voltage is reversed so that a positive voltage is always directed across the xray tube
full wave rectification
27
this results in pulsating xray beam
single phase power
28
multiple voltage waveforms are superimposed on one another, which result in a waveform that maintains a nearly constant high values
three phase power
29
the newest development in high voltage generator design uses a high frequency unit
high frequency generator
30
the parts of an xray unit are identified by their power rating in kW
power rating
31
power = ____ x ____
power = amperes x volts
32
is the variation in peak voltage waveform
voltage ripple
33
three phase six pulse = __% ripple
three phase six pulse = 13% ripple
34
three phase twelve pulse = _% pulse
three phase twelve pulse = 4% pulse