High-resolution multishot spiral diffusion tensor imaging with inherent correction of motion-induced phase errors.

ABSTRACT:

Purpose

To develop and compare three novel reconstruction methods designed to inherently correct for motion-induced phase errors in multishot spiral diffusion tensor imaging without requiring a variable-density spiral trajectory or a navigator echo.

Theory and methods

The first method simply averages magnitude images reconstructed with sensitivity encoding from each shot, whereas the second and third methods rely on sensitivity encoding to estimate the motion-induced phase error for each shot and subsequently use either a direct phase subtraction or an iterative conjugate gradient algorithm, respectively, to correct for the resulting artifacts. Numerical simulations and in vivo experiments on healthy volunteers were performed to assess the performance of these methods.

Re

SUBMITTER: Truong TK 

PROVIDER: S-EPMC3949176 | biostudies-literature | 2014 Feb

REPOSITORIES: biostudies-literature