MRI

Question 1

MR considerations.

Answer 1

-spatial disortions and artefacts
-Electron return effect

Question 2

-spatial disortions and artefacts

Answer 2

disortion ↑ w distance from centre of field

there is : machine specific
patient specific

Question 3

machine specific

Answer 3

field inhomogenities

Question 4

patient specific

Answer 4

-magnetic properties difference in pt tissue (small)
-metallic implanted devices (larger)
-countered by imaging at smaller field strengths

Question 5

Electron return effect

Answer 5

secondary e produced behave in a predictable way
e- travelling large static magnetic field may undergo Lorenz force. and will deviate alot