In-room imaging and MR planning

Sequence: Functional MRI

EPI very common read-out sequence for DWI

Prone to artefacts:

➢ N/2 ghosting (switching between lines)

➢ Distortions (eddy currents) ➢ Large chemical shift requires fat suppression ➢ Huge susceptibility effects along PE

t N

(e.g. 1 ms t

 1 kHz)

Effective ‘phase-encoding’ bandwidth is very small

shot

Δ



=

esp

phase

esp