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Related Concept Videos

Computed Tomography01:10

Computed Tomography

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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.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
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Related Experiment Video

Updated: May 25, 2025

Operative Technique and Nuances for the Stereoelectroencephalographic SEEG Methodology Utilizing a Robotic Stereotactic Guidance System
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Frameless Stereotaxy in Stereoelectroencephalography Using Intraoperative Computed Tomography.

Alexander Grote1, Marko Gjorgjevski1, Barbara Carl1,2

  • 1Department of Neurosurgery, University Hospital Marburg, Philipps University Marburg, Baldingerstrasse, 35043 Marburg, Germany.

Brain Sciences
|February 26, 2025
PubMed
Summary

Frameless stereotactic SEEG electrode implantation is a safe and precise method for identifying the epileptogenic zone in pharmacoresistant epilepsy patients. This technique achieves accuracy comparable to traditional frame-based methods, aiding surgical planning.

Keywords:
SEEGaccuracyepilepsy surgeryinvasive diagnosticnavigation

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Stereo-Electro-Encephalo-Graphy SEEG With Robotic Assistance in the Presurgical Evaluation of Medical Refractory Epilepsy: A Technical Note
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Stereo-Electro-Encephalo-Graphy SEEG With Robotic Assistance in the Presurgical Evaluation of Medical Refractory Epilepsy: A Technical Note
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Area of Science:

  • Neurosurgery
  • Epileptology
  • Medical Imaging

Background:

  • Pharmacoresistant epilepsy impacts ~33% of patients, necessitating advanced diagnostic and surgical interventions.
  • Focal epilepsy surgery offers improved outcomes for selected patients, requiring precise localization of the epileptogenic zone (EZ).
  • Stereoelectroencephalography (SEEG) is crucial for EZ localization, especially in MRI-negative or inconclusive cases.

Purpose of the Study:

  • To evaluate the safety, feasibility, and accuracy of frameless stereotactic SEEG electrode implantation using automated CT-based registration.
  • To assess the precision of this technique by measuring electrode placement accuracy.
  • To compare the accuracy of frameless SEEG with established frame-based methods.

Main Methods:

  • Retrospective analysis of 22 pharmacoresistant epilepsy patients undergoing frameless stereotactic SEEG.
  • Automated CT-based registration for intraoperative electrode placement guidance.
  • Calculation of Euclidean, radial, angular, and depth deviations for 153 implanted electrodes.

Main Results:

  • Median Euclidean distance at entry: 1.54 mm; at target: 2.61 mm.
  • Median radial deviation at entry: 1.33 mm; at target: 1.67 mm.
  • Accuracy was not significantly influenced by electrode order, location, skull thickness, or length.

Conclusions:

  • Frameless stereotactic SEEG with automated CT registration is a safe, feasible, and precise method for EZ identification.
  • This technique offers accuracy comparable to frame-based SEEG while maintaining workflow efficiency.
  • Larger cohort studies are recommended to confirm findings and evaluate surgical outcome impact.