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Bushong Rad Physics > X-ray Tube Ch 7 > Flashcards

X-ray Tube Ch 7 Flashcards

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1
Q

It converts electrical energy to

electromagnetic energy

A

X-ray Tube

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2
Q

Any tube with two electrodes

A

Diode

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3
Q

External Structures if X-ray tube

A

Support Structure, Protective Housing &

Glass/Metal Enclosure

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4
Q

It consists of two perpendicular sets of

ceiling-mounted rails

A

Ceiling-Support System

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5
Q

When x-ray tube is centered above the

examination table at the standard SID

A

Preferred Detent Position

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6
Q

It consists a single column with rollers at

each end

A

Floor-To-Ceiling Support System

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7
Q

It provides for very flexible x-ray tube

positioning

A

C-Arm Support System

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8
Q

Lead-lined metal container into which the xray tube is fitted

A

Protective Housing

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9
Q

Emission with equal intensity in all

directions

A

Isotropic Emission

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10
Q

A thin section of a glass/metal envelope

through which useful beam emerges

A

Window

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11
Q

X-rays emitted through the window

A

Useful Beam/Primary Radiation

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12
Q

X-rays that escape through protective

housing

A

Leakage Radiation

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13
Q

It contains the x-ray tube & its components

A

Glass/Metal Enclosure

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14
Q

Glass Enclosure

A

Pyrex glass
o Able to withstand tremendous heat
generated

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15
Q

Maintain constant electric potential between
the electrons of the tube current & the
enclosure

A

Metal Enclosure

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16
Q

The negative side of the x-ray tube

A

Cathode

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17
Q

2 primary parts of Cathode

A

filament & focusing cup

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18
Q

A coil of wire that emits electrons when it is

heated

A

Filament

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19
Q

Metal shroud that surrounds the filament

A

Focusing Cup

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20
Q

most common cause of tube failure

A

Tungsten vaporization with deposition on the

inside of the glass enclosure

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21
Q

Cloud of electrons

A

Space Charge

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22
Q

A phenomenon of the space charge that
makes it difficult for subsequent electrons to
be emitted by filament because of
electrostatic repulsion

A

Space Charge Effect

23
Q

The x-ray tube current is adjusted by

controlling…

A

the filament current

24
Q

Filament current that has risen to its
maximum value because all available
electrons have been used

A

Saturation Current

25
Q

A region of the anode target in which

electrons interact to produce x-rays, actual x-ray source

A

Focal Spot

26
Q

Important for high resolution magnification

radiography & mammography

A

Round Focal Spot

27
Q

It is used when small body parts are image

& when better spatial resolution is required

A

Small Focal Spot

28
Q

It is used when large body parts are imaged

A

Large Focal Spot

29
Q

The positive side of the x-ray tube

A

Anode

30
Q

3 Most Common Anode Materials

A

Copper (Cu-29), Molybdenum (Mo-

42) & Graphite

31
Q

It is used when high tube current & power

are not required

A

Stationary Anode

32
Q

The area of the anode struck by the electrons

from the cathode

A

Target

33
Q

The material of choice for the target

A

Tungsten (Z=74)

34
Q

3 Main Reasons why Tungsten is the material of choice

A

High Atomic Number
Thermal Conductivity
High Melting Point

35
Q

It allows the electron beam to interact with a

much larger target area

A

Rotating Anode

36
Q

Higher tube currents and shorter exposure

times are possible with…

A

the rotating anode

37
Q

The shaft between the anode & the rotor

A

Anode Stem

38
Q

It is used to turn the anode

A

Electromagnetic Induction Motor

39
Q

2 principal parts of Electromagnetic Induction Motor

A

stator & rotor

40
Q

Located outside the enclosure

A

Stator

41
Q

Located inside the glass envelope

A

Rotor

42
Q

Time it takes the rotor to rest after use (60s)

A

Coast Time

43
Q

the ability of the cone of xrays produced to adequately cover the largest field size used

A

Line Focus Principle

44
Q

The area projected onto the patient & image

receptor

A

Effective Focal Spot/Effective Target Area

45
Q

Consequence of line focus principle

A

Anode Heel Effect

46
Q

The imaginary line generated by the

centermost x-ray in the beam

A

Central Ray

47
Q

X-rays produced in the anode but not at the

focal spot

A

Off-Focus Radiation/Extrafocal X-rays

48
Q

Three Ways of Heat Dissipation

A

Radiation, Conduction & Convection

49
Q

The transfer of heat by the emission of

infrared radiation

A

Radiation

50
Q

The transfer of energy from one area of an

object to another

A

Convection

51
Q

The transfer of heat by the movement of a

heated substance from one place to another

A

Convection

52
Q

It guides & aids the radiographer in using xray tubes & acceptable exposure levels to
maximize x-ray tube life

A

X-ray Tube Rating Chart

53
Q

Three Types of Rating Charts

A
  • Radiographic Rating Chart
  • Anode Cooling Chart
  • Housing Cooling Chart
54
Q

It conveys which radiographic techniques

are safe & unsafe for x-ray tube operation

A

Radiographic Rating Charts

Bushong Rad Physics (8 decks)

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