Real-time distortion correction of spiral and echo planar images using the gradient system impulse response function.

ABSTRACT:

Purpose

MRI-guided interventions demand high frame rate imaging, making fast imaging techniques such as spiral imaging and echo planar imaging (EPI) appealing. In this study, we implemented a real-time distortion correction framework to enable the use of these fast acquisitions for interventional MRI.

Methods

Distortions caused by gradient waveform inaccuracies were corrected using the gradient impulse response function (GIRF), which was measured by standard equipment and saved as a calibration file on the host computer. This file was used at runtime to calculate the predicted k-space trajectories for image reconstruction. Additionally, the off-resonance reconstruction frequency was modified in real time to interactively deblur spiral images.

Results

Real-time distort

SUBMITTER: Campbell-Washburn AE 

PROVIDER: S-EPMC4691439 | biostudies-literature | 2016 Jun

REPOSITORIES: biostudies-literature