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Computed Tomography01:10

Computed Tomography

Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
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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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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

Accelerated slice encoding for metal artifact correction.

Brian A Hargreaves1, Weitian Chen, Wenmiao Lu

  • 1Department of Radiology, Stanford University, Stanford, California 94305-5488, USA. bah@stanford.edu

Journal of Magnetic Resonance Imaging : JMRI
|April 8, 2010
PubMed
Summary
This summary is machine-generated.

Accelerated Slice-encoding for Metal Artifact Correction (SEMAC) significantly reduces artifacts near metallic implants. This advanced MRI technique offers flexible contrast and fast scan times under 11 minutes.

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Area of Science:

  • Radiology
  • Medical Imaging
  • Magnetic Resonance Imaging

Background:

  • Metallic implants in patients pose significant challenges for Magnetic Resonance Imaging (MRI) due to severe artifacts.
  • Artifacts obscure anatomical details and limit diagnostic accuracy in MRI near metallic implants.

Purpose of the Study:

  • To demonstrate accelerated MRI acquisition using Slice-encoding for Metal Artifact Correction (SEMAC).
  • To showcase artifact reduction and preservation of different contrast mechanisms in SEMAC imaging near metallic implants.

Main Methods:

  • SEMAC, a modified spin echo sequence, employs view-angle tilting and slice-direction phase encoding for artifact correction.
  • Integration of parallel imaging and partial Fourier imaging was enabled by linear reconstruction.
  • Standard spin echo and short-TI inversion recovery (STIR) sequences were utilized for various contrast weightings.

Main Results:

  • Accelerated SEMAC demonstrated significant artifact reduction compared to standard techniques without introducing new artifacts.
  • The Signal-to-Noise Ratio (SNR) remained unaffected by SEMAC reconstruction when using standard acceleration.
  • Diverse contrast mechanisms enabled differentiation of fluid and other tissues in subjects with implants.

Conclusions:

  • SEMAC is a versatile technique that can be combined with echo-train, parallel, partial-Fourier, and inversion recovery imaging.
  • This combination allows for flexible image contrast while dramatically reducing metal-induced artifacts.
  • SEMAC achieves these benefits within rapid scan times of under 11 minutes.