3D image-based navigators for coronary MR angiography.

ABSTRACT:

Purpose

To develop a method for acquiring whole-heart 3D image-based navigators (iNAVs) with isotropic resolution for tracking and correction of localized motion in coronary magnetic resonance angiography (CMRA).

Methods

To monitor motion in all regions of the heart during a free-breathing scan, a variable-density cones trajectory was designed to collect a 3D iNAV every heartbeat in 176 ms with 4.4 mm isotropic spatial resolution. The undersampled 3D iNAV data were reconstructed with efficient self-consistent parallel imaging reconstruction (ESPIRiT). 3D translational and nonrigid motion-correction methods using 3D iNAVs were compared to previous translational and nonrigid methods using 2D iNAVs.

Results

Five subjects were scanned with a 3D cones CMRA sequence, accomp

SUBMITTER: Addy NO 

PROVIDER: S-EPMC5849773 | biostudies-literature | 2017 May

REPOSITORIES: biostudies-literature