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Updated: Jan 9, 2026

Protocol for the Evaluation of MRI Artifacts Caused by Metal Implants to Assess the Suitability of Implants and the Vulnerability of Pulse Sequences

Protocol for the Evaluation of MRI Artifacts Caused by Metal Implants to Assess the Suitability of Implants and the Vulnerability of Pulse Sequences

Published on: May 17, 2018

Hexagonal undersampling for faster MRI near metallic implants.

Bragi Sveinsson¹, Pauline W Worters, Garry E Gold

¹Department of Radiology, Stanford University, Stanford, California, USA; Department of Electrical Engineering, Stanford University, Stanford, California, USA.

Magnetic Resonance in Medicine

|February 20, 2014

Summary

This summary is machine-generated.

Faster MRI scans around metal implants are possible using hexagonal undersampling. This technique reduces imaging time by 50% without compromising image quality or metal artifact correction.

Keywords:

SEMAC artifacts metallic implants parallel imaging undersampling

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Last Updated: Jan 9, 2026

Protocol for the Evaluation of MRI Artifacts Caused by Metal Implants to Assess the Suitability of Implants and the Vulnerability of Pulse Sequences

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Published on: May 17, 2018

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Area of Science:

Medical Imaging
Magnetic Resonance Imaging (MRI)

Background:

Metal artifacts in MRI reduce image quality and diagnostic accuracy.
Current slice encoding techniques for metal artifact correction increase scan time.

Purpose of the Study:

To develop a faster MRI technique for imaging around metallic implants.
To reduce imaging time by undersampling k-space using hexagonal sampling.

Main Methods:

Hexagonal sampling was employed to undersample k-space, potentially reducing scan time by 50%.
Comparisons were made between fully sampled and undersampled images from simulations, patients, and phantoms.
Compatibility with parallel imaging and partial Fourier acquisitions was assessed.
Image quality was evaluated using the structural similarity (SSIM) index.

Main Results:

Hexagonal undersampling achieved comparable artifact suppression to fully sampled images.
The SSIM index confirmed high similarity between undersampled and fully sampled images.
No visible difference in artifact suppression was observed.

Conclusions:

Undersampling k-space using hexagonal sampling significantly reduces MRI scan time.
This method maintains image quality and artifact suppression effectiveness.
Faster imaging around metallic implants is achievable without compromising diagnostic quality.