In-room imaging and MR planning

Distortion correction

distorted image

undistorted image

Fieldmap (Hz) Displace ent map (px)

Processing steps

1. Acquire fieldmap

BW= ~10 Hz/px

2. Convert to displacement map

3. Calculate inverse transform

4. Warp original image

BW=1000Hz/px

Images courtesy of Jesper Andersson, Oxford