In-room imaging and MR planning

Summary: EPI

• Many benefits – Single-shot EPI prevents motion corrupted images – Very efficient acquisition scheme (fast!) • Longer readout = more image artifacts – Image distortions occur along the slow (Phase Encode) direction, because the effective gradient strength is low

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Dealing with distortions –

Shimming (homogenize the magnetic field) – Acquire a field-map (measure the field to correct distortions) – Reduce readout length (high BW, parallel imaging)