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A Standardized Protocol for Functional Motor Mapping Using Navigated Transcranial Magnetic Stimulation

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A new coordinates system for cranial organs using magnetic resonance imaging.

Kazufumi Suzuki¹, Ai Masukawa, Sachiko Aoki

¹Department of Radiology, Medical Center East, Tokyo Women's Medical University, Tokyo, Japan. kasuzuki-rad@umin.ac.jp

Acta Oto-Laryngologica

|November 18, 2009

Summary

A novel coordinate system using MRI, labyrinth, and eyeballs enables precise spatial measurement of cranial organs. This method aids in stereotactic analysis of inner ear structures.

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Area of Science:

Neurosurgery
Radiology
Anatomy

Background:

Accurate spatial measurement of cranial structures is crucial for stereotactic analysis.
Existing methods may lack precision for small, complex anatomical regions like the inner ear.

Purpose of the Study:

To develop and evaluate a new coordinate system for magnetic resonance imaging (MRI).
To utilize visible anatomical landmarks (labyrinth and eyeballs) for stereotactic measurements.
To assess the system's utility in analyzing semicircular canal anatomy.

Main Methods:

Development of a novel coordinate system referencing the labyrinth and eyeballs.
Application of vector analysis to MRI volume data of the temporal bone and orbit.
Calculation of angles between semicircular canal planes and the sagittal head plane.

Main Results:

Precise angular measurements were obtained for the anterior, posterior, and horizontal semicircular canals relative to the sagittal plane.
Angles between the semicircular canal planes themselves were calculated, demonstrating inter-canal spatial relationships.
The system proved effective in analyzing small structures within the labyrinth.

Conclusions:

A new MRI-based coordinate system using the labyrinth and eyeballs was successfully developed.
The system provides a reliable method for stereotactic analysis of cranial organs, particularly the inner ear.
This approach enhances the precision of spatial measurements in neuroimaging studies.