Week 3- radiology Flashcards
1
Q
what are the major principals of xrays?
A
xray pass thorugh the body and calcium as a dense ion causes a shaddow
Density differences- many shade of grey
Summation of shadows- images are created by multiple overlapping tissue densities
silhoette sign- edges of objects are seen if there is an interface with a different density of tissue
2
Q
what is a CT?
A
computerised axial tomography
images used to give more information that a traditional xray
3
Q
what is MRI?
A
magnetic resonance imaging
- better for soft tissues with contrast
