SWI

Question 1

Pulse sequence for SWI?

Answer 1

GRE with long TE for strong dephasing

Question 2

Magnetic properties of blood?

Answer 2

Hb02 diamagnetic
deoxy-haemoglobic paramagnetic

Question 3

Steps in SWI?

Answer 3

1) unwrap phase
2) HPF to remove slow varying fields
3) normalise to produce phase mask: 0<f<1
4) multiply phase mask with anatomical image n times to get SW