Meeting Banner
Abstract #3770

An Extended PSF Mapping Method for Distortion Correction in DW-EPI with Both Forward and Reverse Phase-Encoding Polarity at UHF

Myung-Ho In1, Oleg Posnansky1, Erik B. Beall2, Mark J. Lowe3, Oliver Speck1

1Biomedical Magnetic Resonance, Otto-von-Guericke University, Magdeburg, Germany; 2Radiology, Cleveland Clinic, Cleveland, OH, United States; 3Radiology, Imaging Institute, Cleveland Clinic, Cleveland, OH, United States

The geometric distortion correction quality is important to generate a distortion free diffusion weighted echo planar image (DW-EPI) without loss of spatial information. To recover spatial information in strongly compressed areas, two sets of DWIs with opposite phase-encoding (PE) polarities have been measured and combined after distortion correction. The point spread function (PSF) mapping method was used for correction due to its very high accuracy and robustness. To reduce PSF scan time, the PSF method was extended to correct distortions in both DW-EPIs with opposite PE polarities from a single PSF reference.

Abstract PDF Presentation Video

Keywords

acceleration agree agreement although anisotropy appear arrows assumed assuming biomedical brain calculating clinic collapse collinear combination combined compress compressed consuming contours contrary coordinates correct corrected correcting correction depending described deviate deviated diagonal diffusion dimension distorted distortion distortions distributed eddy either encoding enlarged extended fidelity field final forward fractional frontal full fully function future geometric geometry gradient grant green homogeneously improving independent individual institute inverting investigated isotropic kernel leading local locally loss lost magma mapping maps mark materials measured moreover oliver onto opposite optimal outline overlaid partial pipeline planar polarities polarity popular position positions previous proposed protocols radiology reconstruction recovered registration repeated resolution respect reverse reversed sets severe shape shot slice slices spatial speck spin spread stretch stretched strong strongly studies suffers suitable support tensor ultra