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IMAGING EQUIPMENT & MAINTENANCE > The X-ray Tube > Flashcards

The X-ray Tube Flashcards

1
Q

it is the most frequent used system

A

ceiling support

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2
Q

it consists of two sets of rails mounted to the ceiling directly over the radiographic table

A

ceiling support

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3
Q

external structure has 3 components:

A

support structure
protective housing
glass or metal envelope

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4
Q

internal structure has 2 components:

A

anode
cathode

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5
Q

the rails are mounted perpendicular to each other so that the tube can move longitudinally along the length of the table and transversely in a perpendicular direction to the length of the table

A

ceiling support

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6
Q

it has a single column with rollers at each end, one attached to a ceiling mounted rail and other attached to a floor mounted rail

A

floor ceiling support system

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7
Q

interventional radiology suits often are equipped with _____

A

c arm support system

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8
Q

it guards against excessive radiation exposure and electric schock

A

protective housing

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9
Q

what are those xrays emitted through the window called?

A

useful beam

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10
Q

the protective housing contains ___ that serves as both an insulator against electric shock and as a thermal cushion to dissipate heat

A

oil

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11
Q

size of xray tube

A

30-50 cm long
20 cm in diameter

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12
Q

it is a glass that enable to withstand the tremendous heat generated

A

pyrex glass

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13
Q

it is the negative side of the xray tube

A

cathode

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14
Q

it is a coil of wire similar to that in a kitchen toaster, except much smaller

A

filament

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15
Q

filament is made of thoriated ____

A

tungsten

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16
Q

it is when an xray tube filament emits electrons when it is heated, when the current through the filament is sufficiently high, the outer electrons of the filament atoms are boiled off and ejected from the filament

A

thermionic emission

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17
Q

most diagnostic xray tube has two focal spots, one large and one small

A

dual focus

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18
Q

it is a focal spot that used when better spatial resolution is required that has sfs range from 0.1 to 1mm

A

small focal spot

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19
Q

it is a focal spot that is used when large body parts are imaged and when other techniques that provide high heat are required and has lfs range from 0.3 to 2mm

A

large focal spot

20
Q

two types of anode

A

stationary anode
rotating anode

21
Q

it is xray tubes that are used in dental xray imaging system, some portable imaging system and other special purpose units in which high tube current and power are not required

A

stationary anode

22
Q

it is a shaft like structure made primarily of a copper and it is a rotating device

A

rotor

23
Q

it attaches the rotating target area to the rotor

A

stem

24
Q

it is a circular, disk like structure with a slanted or beveled edge

A

target

25
Q

it serves as a target for receiving electrons as they move from cathode to anode

A

target

26
Q

anode is the positive side, it conducts ______ and radiates ____ and contains the target

A

anode is the positive side, it conducts electricity and radiates heat and contains the target

27
Q

target is made up of _____

A

tungsten

28
Q

it is an anode that allows the electron beam to interact with as much larger area

A

rotating anode

29
Q

stem is made up of _____ because it is poor heat conductor

A

copper

30
Q

it is an electromagnetic induction motor that is used to turn the anode

A

induction motor

31
Q

it results in an effective focal spot size much less than the actual focal spot size

A

line focus principle

32
Q

by angling the target, one makes the effective area of the target much special than the actual area of electron interaction

A

line focus principle

33
Q

it is an area that receives beam of electrons from cathode

A

focal spot

34
Q

actual xray sources

A

focal spot

35
Q

focal spot

when the target angle is made smaller, the effective focal spot size is _____

A

focal spot

when the target angle is made smaller, the effective focal spot size is also smaller

36
Q

two focal spot called

A

biangular target

37
Q

it is projected on to the patient with the size of the actual focal spot

A

effective focal spot

38
Q

it results in smaller effective focal spot and less radiation intensity on the anode side of the xray beam

A

anode heel effect

39
Q

low intensity anode, high intensity cathode

A

anode heel effect

40
Q

anode heel effect

the smaller the anode angle, the ___ is the heel effect

A

anode heel effect

the smaller the anode angle, the larger is the heel effect

40
Q

anode heel effect

the smaller the anode angle, the ___ is the heel effect

A

anode heel effect

the smaller the anode angle, the larger is the heel effect

41
Q

positioning the cathode side of the xray tube over the thicker part of the anatomy provides more uniform optical density on the film

A

anode heel effect

42
Q

it is when some of the electrons bounce off the focal spot and then land on the other areas of the target causing xrays to be produced from outside the focal spot

A

extrafocal radiation

43
Q

extrafocal radiation also called ___

A

extrafocal radiation also called off focus radiation

44
Q

it is undesirable, can extend the size of focal spot and can increase patient dose and reduces image contrast

A

extrafocal radiation

44
Q

it is undesirable, can extend the size of focal spot and can increase patient dose and reduces image contrast

A

extrafocal radiation

IMAGING EQUIPMENT & MAINTENANCE (6 decks)

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