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WE-G-217A-06: Spatial Accuracy Quantification of an MR System.

K Hwang1, G McKinnon1, J Lorbiecki1

  • 1General Electric Company, Waukesha, WI.

Medical Physics
|May 19, 2017
PubMed
Summary
This summary is machine-generated.

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A new phantom and protocol accurately measure magnetic resonance imaging (MRI) spatial accuracy across the entire imaging volume. This tool enhances MR-guided therapies and aids in developing distortion correction algorithms.

Area of Science:

  • Medical Imaging
  • Biomedical Engineering

Background:

  • Spatial accuracy is crucial for Magnetic Resonance Imaging (MRI) systems.
  • Current methods may not comprehensively assess accuracy across the entire imaging volume.

Purpose of the Study:

  • To develop a novel phantom and measurement protocol for quantifying the spatial accuracy of MRI systems.
  • To cover the entire imaging volume of the MRI scanner.

Main Methods:

  • A phantom with embedded oil capsule markers in foam was developed.
  • A 3D FGRE sequence with extended FOV was used for imaging.
  • Computed Tomography (CT) provided a gold standard for error calculation.

Main Results:

  • The phantom and protocol were successfully executed on two MRI scanners.
Keywords:
Computed tomographyComputer softwareError analysisImage analysisImage scannersMedical imagingMedical magnetic resonance imagingSequence analysisSpatial analysisSpatial dimensions

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  • Marker detection varied, with some affected by field inhomogeneity.
  • Maximum spatial errors were analyzed based on distance from the isocenter.

    • Conclusions:

    • The developed phantom and protocol effectively verify MRI spatial accuracy.
    • This verification can improve MR-guided therapies and confidence.
    • Data generated may support the development of advanced distortion correction algorithms.