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T-Hex: Tilted hexagonal grids for rapid 3D imaging.

Maria Engel1, Lars Kasper1,2, Bertram Wilm1

  • 1Institute for Biomedical Engineering, ETH Zurich and University of Zurich, Zurich, Switzerland.

Magnetic Resonance in Medicine
|December 3, 2020
PubMed
Summary
This summary is machine-generated.

Tilted hexagonal (T-Hex) MRI sampling accelerates 3D imaging by increasing k-space coverage per shot. This method offers high speed and flexibility for applications like functional MRI (fMRI).

Keywords:
3D encodingalgebraic image reconstructionmagnetic field monitoringspiral imaging

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Biomedical Engineering
  • Signal Processing

Background:

  • Fast 3D k-space sampling in MRI typically uses 2D readouts, limiting speed.
  • Existing methods face challenges with flexible segmentation and uniform k-space density.
  • Minimizing magnetic field (B0) effects is crucial for image quality.

Purpose of the Study:

  • To develop and demonstrate a 3D MRI encoding strategy balancing speed, segmentation flexibility, and uniform k-space density.
  • To address benign B0 effects in fast 3D MRI acquisition.
  • To improve signal-to-noise ratio (SNR) efficiency in 3D MRI.

Main Methods:

  • Introduced Tilted Hexagonal (T-Hex) sampling for acquiring more k-space volume per excitation.
  • Controlled k-space volume coverage per shot via a tilting angle.
  • Employed a 3D iterative SENSE reconstruction incorporating field dynamics and off-resonance effects.
  • Compared T-Hex imaging speed and noise performance against established 3D schemes.

Main Results:

  • T-Hex acquisition demonstrated superior imaging speed compared to existing alternatives, especially with spiral trajectories.
  • Successfully addressed the interplay of 3D trajectories, array detection, and off-resonance effects.
  • Achieved greatest utility for high-speed imaging at intermediate resolutions (1-4 mm).
  • T-Hex EPI combined extended coverage per shot with enhanced robustness against off-resonance.

Conclusions:

  • Tilted hexagonal grid sampling is a feasible method for achieving 3D imaging speed with near-optimal SNR efficiency.
  • The technique offers benign depiction properties suitable for various MRI applications.
  • T-Hex sampling is particularly promising for time-resolved imaging, such as functional MRI (fMRI).