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Radiography Digital Age > Chapters 8 & 9 > Flashcards

Chapters 8 & 9 Flashcards

1
Q

What is needed to push electrons from the cathode to the anode?

A

High voltage

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2
Q

The step up transformer is located in what part of the x-ray circuit?

A

Main x-ray circuit

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3
Q

Which part of the circuit increases the voltage to a known quality?

A

Compensation circuit

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4
Q

Which part of the circuit increases the voltage

A

Step-up transformer

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5
Q

What is the purpose of the rectifier?

A

Changing AC to DC

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6
Q

What device adjusts the number of electrons?

A

mA selector

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7
Q

Thermionic Emissions requires?

A

High number of electrons, low voltage, high resistance

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8
Q

Rotoring activates?

A

Filament circuit

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9
Q

What is the most common interaction in the anode?

A

Heat

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10
Q

What anode material is most commonly used in conventional radiography?

A

Tungsten

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11
Q

The strength of bremsstrahlung-produced x-ray depends on?

A

How close the incident electron comes to the nucleus

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12
Q

If an incident electron hits the nucleus, what type of interaction occurs?

A

Bremsstrahlung

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13
Q

If the kVp is set to the 90 and the incident electron slams into the nucleus, what is the resulting power of the x-ray photon?

A

90 keV

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14
Q

Characteristic x-ray production is the result of an interaction between an?

A

Incident electron and an orbiting electron

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15
Q

During bremsstrahlung x-ray production, a greater number of strong x-rays are produced than weak ones?

A

False

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16
Q

If a characteristic cascade occurs in an atom w/4 shells, how many x-rays could be created?

A

3

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17
Q

In an electric current, how many pulses are generated in one direction if the electricity is @ 60 hertz?

A

60

18
Q

AC is needed to?

A

Adjust the kVp

19
Q

How many pulses are there in 60 Hz in a full wave rectified DC?

A

120

20
Q

When an electric current is rectified?

A

It is changed from AC to DC

21
Q

In which of these examples are there times at which there is no electron movement?

A

Single-phase, half-wave power

22
Q

Voltage ripple describes?

A

The fluctuating power of electron movement

23
Q

Single phase power requires an increase in technique compared w?High Frequency? (T or F)

A

True

24
Q

Most x-ray are produced through the ________ process?

A

Bremsstrahlung

25
Q

X-ray emission spectrum proves that more x-rays are produced through Bremsstrahlung process than any other interaction? (T or F)

A

True

26
Q

Common filter material used in conventional radiography?

A

Aluminum

27
Q

The heel effect?

A

Exists because some x-rays are absorbed by the surface of the anode?

28
Q

The principle means of heat transfer from the focal spot to the anode is?

A

Radiation

29
Q

The line focus principle?

A

Spreads the heat over a larger part of the anode

30
Q

The purpose of the cathode focusing cup is to?

A

Group electrons for their passage to the anode

31
Q

A molybdenum shaft is used to connect the anode to the rotor because?

A

It is a less dense metal with high melting point

32
Q

The principle means of heat transfer from the anode to the housing is?

A

Radiation

33
Q

The boost current in a filament?

A

Raises the filament to its operating temp.

34
Q

An increase in target angle will increase the heat capacity? (T or F)

A

T

35
Q

An increase in focal spot size will increase the heat capacity of the tube? (T or F)

A

T

36
Q

An increase in anode rotation speed will increase the heat capacity of the tube? (T or F)

A

T

37
Q

The transfer of heat by ________ is increase by mounting a fan on the tube housing?

A

Convention

38
Q

The principle means of heat transfer from the tube housing to the room is?

A

Convention

39
Q

The heel effect is more pronounced?

A

With a smaller SID

40
Q

The disadvantage of a small target angle is?

A

Greater anode heel effect

41
Q

Thermionic emission is the emission of?

A

Electrons from the heated cathode

42
Q

The tube current (mA) is changed by changing the?

A

Filament current

Radiography Digital Age (2 decks)

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