Abstract #1627

Segmented accelerated multi-shot diffusion imaging combined with reverse polarity gradient (RPG) correction

Jens Johansson¹, Kerstin Lagerstrand^2,3, Pär-Arne Svensson⁴, Jr-yuan George Chiou⁵, Bruno Madore⁵, Hanna Hebelka^1,4, and Stephan Maier^1,5

¹Department of Radiology, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden, ²Medical radiation sciences, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden, ³Department of Medical Physics and Biomedical Engineering, Sahlgrenska University Hospital, Gothenburg, Sweden, ⁴Department of Radiology, Sahlgrenska University Hospital, Gothenburg, Sweden, ⁵Department of Radiology, Brigham and Women's Hospital, Boston, MA, United States

Synopsis

The inherent low bandwidth along the phase encoding direction in diffusion-weighted imaging with echo-planar signal readout can cause severe image distortions. These artifacts arise near tissue boundaries and are caused by static magnetic field inhomogeneities. Correction of such artifacts can considerably improve clinical value. We combine a previously presented segmented accelerated multi-shot diffusion imaging method with reverse polarity gradient (RPG) for markedly improved reduction of geometric distortions.

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