Lec 5 Chest Radiography Flashcards Preview

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Flashcards in Lec 5 Chest Radiography Deck (6):

What is physics of how xray works?

- electrons accelerated in vaccume tube and collide with anode usually tungsten


How are characteristic xrays generated?

- high energy electron collides with inner shell electron, both electrons ejected leaving hole in inner layer
- hole filled by outer layer electron


How are bremsstrahlung x rays generated

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

energy lost is emitted


Are most xrays generated characteristic or bremsstrahlung

mostly bremsstrahlung (~80%)


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

air < fat < soft tissue < bone < metal

black --> gray --> white


What 3 different types of projections?

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