Components of an X-ray tube Flashcards

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1
Q

What is the Tube insert?

A

An inner housing vacuum around the inner components

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2
Q

What is the cathode block?

A

This is the negative terminal of the tube

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3
Q

What is the Filament?

A

A linear spiral mounted in the focusing cup which has its own electrical supply to produce the space charge

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4
Q

Name 5 features of the filament

A
  • Made of tungsten
  • High melting point
  • Ductile
  • Low work function
  • Low vapour pressure
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5
Q

What is the Focusing Cup?

A

Elongated deep open structure connected to highly negative output which holds electrons around the
filament as a space charge aswell as repelling electrons from filament

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6
Q

Name the two different sizes of filament inside the

focussing cup

A

Fine focus

Broad focus

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7
Q

What other function can the focusing cup be used for?

A

As a switch

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8
Q

What does increasing the charge on the focussing cup do?

A

Holds electons in a cloud near the focussing cup, when the charge on the focussing cup is reduced this allows the electrons to flood across the x-ray tube instantly

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9
Q

Name 5 features of the Stationary Anode

A
  • Made of tungsten
  • High melting point
  • Low vaporisation pressure
  • High atomic number
  • Can form a durable block
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10
Q

Increasing the anode angle does what the the anode heel effect?

A

Decreases Andone heel effect

They are inversely proportional

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11
Q

The Rotating Anode is made of 3 sections, what are they?

A

Focal track
Disc
Disc backing

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12
Q

How is Anode rotation achieved?

A

Electromagnetic induction from an alternating current producing a magnetic field

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13
Q

What is the Glass envelope?

A

Evacuated container which provides electrical insulation

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14
Q

Name 5 features of the Glass envelope

A
  • Borosilicate glass
  • Heat resistant
  • Strong
  • Electrical insulator
  • Radiolucent
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15
Q

Name 5 features of the Tube Housing?

A
  • Aluminium or mild steel
  • Securely contains the oil
  • Radiation protection
  • Provides tube port
  • Electrical safety
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16
Q

What is Extra Focal or Off-focus Radiation?

A

Extrafocal radiation is radiation that is produced from the interactions of electrons with any parts of the x-ray tube which are NOT the focal spot

17
Q

What is Leakage Radiation?

A

This is radiation that emerges from the tube housing rather than the tube port, lead is in the housing to reduce the amount of leakage radiation

18
Q

Name 3 ways the X-ray tube cools down?

A

The heat is radiated away from the anode target when it spins

Thermal energy is conducted away along the (stationary) anode block

The oil that surrounds the insert removes heat away from the tube insert by convection