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Interscan registration using navigator echoes.

Edward Brian Welch1, Armando Manduca, Roger C Grimm

  • 1Department of Diagnostic Radiology, Mayo Clinic, Rochester, Minnesota 55905, USA.

Magnetic Resonance in Medicine
|November 25, 2004
PubMed
Summary
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Clinical MRI alignment is improved using spherical navigator echoes to precisely adjust spatial orientation and location between scans. This technique enhances the accuracy of assessing anatomic changes over time in serial MRI studies.

Area of Science:

  • Medical Imaging
  • Radiology
  • Biomedical Engineering

Background:

  • Anatomic misalignment of imaging slices across serial magnetic resonance imaging (MRI) studies complicates the assessment of anatomic changes over time.
  • Inconsistent spatial orientation and location between successive MRI examinations hinder accurate longitudinal radiologic evaluation.

Purpose of the Study:

  • To develop and evaluate a technique using navigator echoes for precise spatial alignment of serial MRI examinations.
  • To improve the accuracy of assessing anatomic changes in longitudinal MRI studies by correcting for misalignment.

Main Methods:

  • Spherical navigator echoes were employed to detect and correct rigid body motion in all six degrees of freedom.
  • An initial linear navigator echo was used for coarse Z-axis translation adjustments.

Related Experiment Videos

  • Spatial location and orientation adjustments were guided to match the reference frame of earlier MRI scans.

    • Main Results:

    • The navigator echo technique substantially improved the alignment of subsequent MRI examinations in all five volunteers.
    • The method demonstrated robust performance in aligning head image volumes acquired on two different scanners.
    • Navigator-guided alignment performed favorably when compared to retrospective image-based registration techniques.

    Conclusions:

    • Navigator echoes provide an effective solution for correcting anatomic misalignment in serial MRI studies.
    • This technique enhances the reliability of assessing longitudinal anatomic changes, crucial for clinical decision-making.
    • The proposed method offers a valuable tool for improving the quality and consistency of MRI-based assessments over time.