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Rad Physics II > X-ray Tube Part 2 > Flashcards

X-ray Tube Part 2 Flashcards

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1
Q

2 principal parts of Induction Motor

A

Rotor

Stator

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2
Q

Outside part of the enclosure

A

Stator

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3
Q

Consists of series of electromagnets equally spaced around the neck of the tube

A

Stator

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4
Q

Stator may either be

A

Permanent magnet or

Electromagnet

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5
Q

An electromagnetic coil of copper wire that is connected to a power supply

A

Stator

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6
Q

Sends pulses of energy to the stator which in turn induces motion into the anode assembly

A

Rotor controller

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7
Q

Wire that transfers rotor controller to the stator

A

Stator cord

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8
Q

Shaft inside the enclosure

A

Rotor

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9
Q

Rotor is made of

A

Bars of copper and soft iron

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10
Q

Works through electromagnetic induction

A

Induction motor

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11
Q

Production of voltage across a conductor moving through a magnetic field

A

Electromagnetic induction

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12
Q

Covert electricity into mechanical energy

A

Electric motor

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13
Q

Current in each stator wirings induces

A

Magnetic field

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14
Q

Are energized sequentially so that induced magnetic field rotates on the axis of the stator

A

Stator

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15
Q

Short delay allows

A

The rotor to accelerate to its designated rpm while filament is heated

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16
Q

Where the high voltage electrons hit the anode

A

Focal spot

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17
Q

Focal spot is also known as

A

Target
Focus
Focal point

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18
Q

Area around the anode that is exposed to electrons

A

Actual focal spot

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19
Q

Area projected onto the patient

A

Effective focal spot

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20
Q

Impacts the geometric resolution of the X-ray image

A

Focal spot

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21
Q

Smaller the focal spot

A

Better spatial resolution

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22
Q

Designed incorporated into the X-ray tube targets allowing large area of heating while maintaining a small focal spot

A

Line Focus principle

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23
Q

Angling of the target

A

Line focus principle

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24
Q

Diagnostic tube target angles allows

A

5 to 20 degrees

25
Q

Reduce the effective area of the focal spot

A

Line focus principle

26
Q

Effective focal spot is controlled by

A

Size of the actual focal spot

Anode target angle

27
Q

Electrons can rebound and interact with other areas

A

Off-Focal Radiation

28
Q

Control of Off Focal Radiation

A

Diaphragm (place bet the tube)

Collimator (reduce off focus rays)

29
Q

Produces two off focal spot sizes because of two diff target angles

A

Biangular Targets

30
Q

Radiation intensity on the cathode side is greater than the anode side

A

Anode-Heel Effect

31
Q

Heel effect is considered when

A

Positioning areas with diff thickness or density

32
Q

Placed over the area if greater density

A

Cathode side

33
Q

In full supine X-ray

A

Anode should be up

Cathode down

34
Q

Under the control of radiologic technologist

A

X-ray tube life

35
Q

Extended by using minimum radio graphic factors

A

Tube life

36
Q

Three forms of tube cooling

A

Radiation
Convection
Conduction

37
Q

Anode may glow red hot and emit infrared energy

A

Radiation

38
Q

Heat is conducted through narrow molybdenum neck to the rotor assembly

A

Conduction

39
Q

Glass enclosure raises temperature of the oil bath

A

Convection

40
Q

Warming the anode through a series of exposure and increasing the kVp settings, the anode will build up heat

A

Tube warm-up procedure

41
Q

Charts that guide radiologic technologist on the use of X-ray tubes

A

X-ray tube rating charts

42
Q

Three types of X-ray tube rating charts

A

Radiographic rating chart
Anode cooling chart
Housing cooling chart

43
Q

Conveys which radiographic technique is safe or unsafe

A

Radiographic rating charts

44
Q

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

A

Radiographic rating charts

45
Q

There are diff charts for

A

Filament use
Speed of the anode
Target angle
Voltage rectification

46
Q

Given mA, any combination of kVP and time that lies below the mA curve

A

Safe

47
Q

Lies above the curve

A

Unsafe

48
Q

Has limited capacity for storing heat

A

Anode

49
Q

Thermal energy is measured in

A

Heat units (HU)

50
Q

Anode cooling chart: single-phase formula

A

HU = kVp x mA x time

51
Q

Anode cooling chart: three-phase / high frequency formula

A

HU = 1.4 x kVp x mA x time

52
Q

Heats in Joules formula

A

heat (J) = w x kVp x mAs

53
Q

1 HU =

A

1.4 J

54
Q

Used to determine the length of time required for complete cooling after any level of heat input

A

Anode cooling chart

55
Q

Maximum of 350,000 HU

A

15 minutes to cool down

56
Q

Tube housing have the capacity of ___ HU

A

1 to 1.5 million

57
Q

Complete cooling of tube housing

A

1 to 2 hours

58
Q

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

A

Housing Cooling charts

59
Q

Turn the anode

A

Induction Motor

Rad Physics II (10 decks)

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