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Related Experiment Videos

A computer simulation program for MR imaging: application to RF and static magnetic field imperfections

M B Olsson1, R Wirestam, B R Persson

  • 1Department of Radiation Physics, Lund University Hospital, Sweden.

Magnetic Resonance in Medicine
|October 1, 1995
PubMed
Summary

This study presents a computer simulation program for magnetic resonance imaging (MRI) artifacts. The program models image distortions, like those from metallic implants, by applying Bloch equations to simulate spin behavior.

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Area of Science:

  • Medical Imaging
  • Computational Physics

Background:

  • Metallic implants in magnetic resonance imaging (MRI) can cause significant image artifacts.
  • Accurate simulation of these artifacts is crucial for understanding and mitigating their impact on diagnostic quality.

Purpose of the Study:

  • To present a novel computer simulation program designed to demonstrate various MRI artifacts.
  • To model image distortions specifically caused by metallic implants.

Main Methods:

  • The program utilizes the Bloch equations to simulate the behavior of spins within a magnetic field.
  • Raw data are generated by repeatedly applying Bloch equations to the magnetization vector of each point in a simulated object throughout the pulse sequence.
  • Special attention is given to intravoxel dephasing and rephasing effects, with implemented algorithms to address these phenomena.

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Main Results:

  • The simulation program successfully demonstrates image distortions caused by metallic implants.
  • The implemented algorithms accurately account for intravoxel dephasing and rephasing effects.

Conclusions:

  • The developed computer simulation program is a valuable tool for studying MRI artifacts.
  • The program's flexibility allows for the simulation of diverse imaging scenarios under the condition that spins obey the Bloch equations.