Retrospective correction of head motion using measurements from an electromagnetic tracker.

ABSTRACT:

Purpose

To investigate the feasibility of using an electromagnetic (EM) tracker to estimate rigid body head motion parameters, and using these measurements to retrospectively reduce motion artifacts.

Theory and methods

A clinically used MPRAGE sequence was modified to measure motion using the EM tracking system once per repetition time. A retrospective k-space based motion correction algorithm that corrects for phase ramps (translation in image domain) and rotation of 3D k-space (rotation in image domain) was developed, using the parameters recorded using an EM tracker. The accuracy of the EM tracker for the purpose of motion measurement and correction was tested in phantoms, volunteers, and pediatric patients.

Results

Position localization was accurate to the order o

SUBMITTER: Afacan O 

PROVIDER: S-EPMC6824937 | biostudies-literature | 2020 Feb

REPOSITORIES: biostudies-literature