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Stereotactic localization using magnetic resonance imaging

L Walton1, A Hampshire, D M Forster

  • 1Department of Medical Physics and Clinical Engineering, Weston Park Hospital, Sheffield, UK.

Stereotactic and Functional Neurosurgery
|January 1, 1995
PubMed
Summary
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This study evaluated stereotactic localization accuracy using MRI. Removing a fiducial plate improved accuracy in some planes but worsened it in others, highlighting the importance of all fiducial plates for precise imaging.

Area of Science:

  • Medical Imaging
  • Radiology
  • Neurosurgery

Background:

  • Accurate stereotactic localization is crucial for image-guided interventions.
  • Magnetic Resonance Imaging (MRI) is increasingly used for stereotactic procedures.
  • Understanding the impact of fiducial markers on localization accuracy is essential.

Purpose of the Study:

  • To assess the accuracy of stereotactic localization using MRI.
  • To evaluate the effect of a specific fiducial plate on localization accuracy across different imaging planes.

Main Methods:

  • A phantom study was conducted using an array of Perspex rods.
  • Stereotactic coordinates were determined and compared with measured values.
  • Analyses were performed on transverse, coronal, and sagittal MRI images, with and without a third fiducial plate.

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Main Results:

  • In transverse imaging, maximum errors were X=2.3 mm, Y=10.7 mm. Removing the third plate improved Y-accuracy (max error Y=2.1 mm) but increased X-errors (max error X=3.5 mm).
  • In coronal imaging, maximum errors were X=1.8 mm, Z=8.0 mm. Removing the third plate reduced Z-errors (max error Z=3.3 mm) with minimal impact on X-accuracy (max error X=1.9 mm).
  • In sagittal imaging, maximum errors were Y=1.1 mm, Z=7.5 mm. Calibration was not possible without the third plate.

Conclusions:

  • The use of all three fiducial plates is necessary for accurate stereotactic localization in sagittal MRI.
  • Removing the third fiducial plate can improve accuracy in specific directions (e.g., Y in transverse, Z in coronal) but may degrade accuracy in others.
  • The optimal configuration of fiducial markers for stereotactic MRI localization depends on the imaging plane and desired accuracy.