Motion correction for functional MRI with three-dimensional hybrid radial-Cartesian EPI.

ABSTRACT:

Purpose

Subject motion is a major source of image degradation for functional MRI (fMRI), especially when using multishot sequences like three-dimensional (3D EPI). We present a hybrid radial-Cartesian 3D EPI trajectory enabling motion correction in k-space for functional MRI.

Methods

The EPI "blades" of the 3D hybrid radial-Cartesian EPI sequence, called TURBINE, are rotated about the phase-encoding axis to fill out a cylinder in 3D k-space. Angular blades are acquired over time using a golden-angle rotation increment, allowing reconstruction at flexible temporal resolution. The self-navigating properties of the sequence are used to determine motion parameters from a high temporal-resolution navigator time series. The motion is corrected in k-space as part of the image recon

SUBMITTER: Graedel NN 

PROVIDER: S-EPMC5516130 | biostudies-literature | 2017 Aug

REPOSITORIES: biostudies-literature