Lec 5 Chest Radiography Flashcards Preview

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Flashcards in Lec 5 Chest Radiography Deck (6)
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1
Q

What is physics of how xray works?

A
  • electrons accelerated in vaccume tube and collide with anode usually tungsten
2
Q

How are characteristic xrays generated?

A
  • high energy electron collides with inner shell electron, both electrons ejected leaving hole in inner layer
  • hole filled by outer layer electron
3
Q

How are bremsstrahlung x rays generated

A
  • when electron passes near nucleus it is slowed down and its path is deflected

energy lost is emitted

4
Q

Are most xrays generated characteristic or bremsstrahlung

A

mostly bremsstrahlung (~80%)

5
Q

What is level of attenuation [absorption] of different tissues?

A

air < fat < soft tissue < bone < metal

black –> gray –> white

6
Q

What 3 different types of projections?

A
  • frontal posterior-anterior [PA] = requires standing up
  • frontal anterior-posterior [AP]
  • lateral