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