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Radphy 2 > Xray tube Part 2 > Flashcards

Xray tube Part 2 Flashcards

0
Q

Principal parts of induction motor

A

Rotor

Stator

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1
Q

Used to turn the anode

A

Induction motor

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2
Q

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

A

Stator

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3
Q

Electromechanical coil of copper wire that is connected to a power supply

A

Stator

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4
Q

Sends pulses of energy to the stator

A

Rotor controller

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5
Q

Wire that transfer rotor controller power to stator

A

Stator cord

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6
Q

Shaft inside the enclose made of copper and soft iron

A

Rotor

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7
Q

Production of voltage across a conductor moving through a magnetic field

A

Electromagnetic induction

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8
Q

This allows the rotor to accelerate to its designated rpm while the filament is heated

A

Exposure switch

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9
Q

Where the high voltage electrons hit the anode from which xrays ate emitted

A

Focal spot / focal point / focus / target

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10
Q

Area on the target that is exposed to electrons

A

Actual focal spot

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11
Q

The area projected onto the patient

A

Effective focal spot

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12
Q

The ______ the focal spot , tge better the spatial resolution of the image

A

Smaller

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13
Q

Incorporated into the xray tube targets allowing a large area for heating w/ small focal spot

A

Line focus principle

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14
Q

Angling the target is also

A

Line focus principle

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15
Q

Diagnosing tube target angles

A

5 to 20 deg

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16
Q

Used to reduced the effective area of the focal spot

A

Line focus principle

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17
Q

As the angle decreases, effective focal spot

A

Decreases

18
Q

Electrons can rebound and interact with other areas

A

Off focal radiation

19
Q

Diaphragm is placed between the tube and the collimator to reduce off focal rays

A

Control off focal radiation

20
Q

Produces two focal spot sizes because of two different target angles on the anode

A

Biangular targets

21
Q

The radiation intensity on the cathode side of the xray field is greater that the on the anode side

A

Anode heel effect

22
Q

Primarily under the control of rad tech

A

Xray tube life

23
Q

Three forms of cooling

A

Radiation
Conduction
Convection

24
Q

The anode may glow red hot

A

Radiation

25
Q

Heat is conducted through molybdenum

A

Conduction

26
Q

Heated glass enclosure raises temperature of the oil bath

A

Convection

27
Q

Maximum radiographic techniques should never be applied to

A

Cold anode

28
Q

Xray tube failure

A 
Thermal characteristics
Maintain anode elevated temperature
Bearing damage
Prolonged heat
Electron arcing from filament
29
Q

Chart that guide radtech in use of xray tubes

A

Xray tube rating charts

30
Q

3 types of xray rating charts

A

Radiographic rating chart
Anode cooling chart
Housing cooling chart

31
Q

Comveys which radiographic technoque is safe ang unsafe

A

Radiographic rating chart

32
Q

Guide the most common technical factor combination

A

Radiographic rating chart

33
Q

Anode has a limited capacity for storing heat

A

Anode cooling chart

34
Q

Thermal energy in xray is measured

A

Heat units

35
Q

Single phase formula

A

HU = kVp x ma x s

36
Q

Three phase / high frequency

A

HU = 1.4 x kVp x mA x s

37
Q

Used to determine the length of the time for complete cooling

A

Anode cooling chart

38
Q

It would take ____ to cool the anode

A

15 mins

39
Q

Tube housing have capacity of

A

1 to 1.5 million HU

40
Q

Anode has the capacity of

A

350,000 HU

41
Q

Complete cooling of the housing

A

1 to 2 hours

42
Q

Calculation of time necessary for the housing to cool

A

Housing cooling chart

43
Q

Extending tube life

A 
Warm up the anode
Dont hold the rotor switch unnecessarily
Lower mAs
Lower speed rotor
Dont make repeated exposure
Dont rotor the tube housing rapidly
Dont use a tube when you hear rotor bearings

Radphy 2 (8 decks)

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