Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

S4: Radiographic Imaging > Chapter 5 Key Terms > Flashcards

Chapter 5 Key Terms Flashcards

1
Q

Actual focal spot

A

the physical area of the focal track that is impacted

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

Anode

A

the positive side of the x-ray tube; serves as a target surface for high-voltage electrons from the filament, conducts the high voltage from the cathode back into the x-ray generator circuity, and serves as the primary thermal conductor

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

Anode assembly

A

consists of anode, stator, and rotor

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

Anode cooling charts

A

permits the calculation of the time necessary for the anode to cool enough for additional exposures to be taken

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

Anode heel effect

A

due to the geometry of the angled anode target, the radiation intensity is greater on the cathode side

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

Cathode

A

the negative side of the x-ray tube; produces a thermionic cloud, conducts the high voltage to the gap between the cathode and the anode, and focuses the electron stream as it heads for the anode

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

Cathode assembly

A

consists of the filament, focusing cup, and associated wiring

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

Dual-focus

A

a two-filament arrangement within the x-ray tube

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

Effective focal spot

A

the area of the focal spot that is projected out of the tube toward the object being radiographed

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

Envelope

A

the entire cathode and anode assembly is housed within this glass or metal structure

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

Extrafocal radiation

A

photons that were not produced at the focal spot; also called off-focus radiation

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

Filament

A

a small coil of thin thoriated tungsten wire

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

Focal point

A

the portion of the anode where the high-voltage electron stream will impact

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

Focal spot

A

the portion of the anode where the high-voltage electron stream will impact

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

Focal track

A

the portion of the anode where the high-voltage electron stream will impact. When discussing a rotating anode, this describes the circular path that will be impacted by the electron beam

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

Focus

A

the portion of the anode where the high-voltage electron stream will impact

17
Q

Focusing cup

A

a shallow depression in the cathode assembly designed to house the filament

18
Q

Fractional focal spot

A

a very small focal spot; usually a fraction of a millimeter in size

19
Q

Grid-biased

A

a type of tube that quickly regulates the flow of electrons, producing x-ray photons

20
Q

Grid-controlled

A

a type of tube that quickly regulates the flow of electrons, producing x-ray photons

21
Q

Grid-pulsed

A

a type of tube that quickly regulates the flow of electrons producing x-ray photons

22
Q

Housing cooling charts

A

permits the calculation of the time necessary for the housing to cool enough for additional exposures to be made

23
Q

Leakage radiation

A

any photons that escape from the housing except at the port

24
Q

Line-focus principle

A

used to reduce the effective area of the focal spot

25
Q

Off-focus radiation (extrafocal radiation)

A

photons that were not produced at the focal spot

26
Q

Protective housing

A

the entire cathode and anode assembly is housed within this metal structure

27
Q

Radiographic tube rating charts

A

a guide regarding the most common technical factor combinations that can be used without overlooking the tube

28
Q

Rotating anodes

A

an anode assembly that turns during exposure

29
Q

Rotor

A

a hollow copper cylinder or cuff that is attached to the anode disk by a molybdenum shaft

30
Q

Saturation current

A

as kVp increases, a greater percentage of the thermionically emitted electrons are driven toward the anode

31
Q

Space charge effect

A

as more and more electrons build up in the area of the filament, their negative charges begin to oppose the emission of additional electrons

32
Q

Stationary anodes

A

an anode assembly that is immobile

33
Q

Stator

A

induction-motor electromagnets that turn the anode

34
Q

Target

A

the portion of the anode where the high-voltage electron stream will impact

35
Q

Tube rating charts

A

provides a guide regarding the most common technical factor combinations that can be used without overloading the tube

36
Q

Window

A

a structure where the primary x-ray beams exit the envelope, which allows less absorption or scatter of photons

37
Q

Wiring

A

the parts within the cathode assembly that connect the elements of the assembly together

S4: Radiographic Imaging (31 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions