MRI Flashcards
1
Q
MR considerations.
A
-spatial disortions and artefacts
-Electron return effect
2
Q
-spatial disortions and artefacts
A
disortion ↑ w distance from centre of field
there is : machine specific
patient specific
3
Q
machine specific
A
field inhomogenities
4
Q
patient specific
A
-magnetic properties difference in pt tissue (small)
-metallic implanted devices (larger)
-countered by imaging at smaller field strengths
5
Q
Electron return effect
A
secondary e produced behave in a predictable way
e- travelling large static magnetic field may undergo Lorenz force. and will deviate alot
