Prospective head-movement correction for high-resolution MRI using an in-bore optical tracking system

Area of Science:

• Medical Imaging
• Biomedical Engineering
• Neuroscience

Background:

• Subject motion is a primary factor degrading magnetic resonance image (MRI) quality in human brain scans.
• Head motion during MRI acquisition leads to artifacts and reduced diagnostic accuracy.

Purpose of the Study:

• To develop and evaluate an in-bore optical motion tracking system for prospective motion correction in brain MRI.
• To enhance the quality and reliability of MRI data by mitigating head motion effects.

Main Methods:

• An in-bore optical motion tracking system utilizing two MR-compatible infrared cameras was implemented.
• Cameras were positioned close to the head coil for precise tracking of subject movement.
• The MRI scanner prospectively compensated for detected head motion by adjusting gradient fields, RF phases, and frequencies.

Main Results:

• The system demonstrated robust performance in tracking head motion during MRI acquisition.
• Achieved translation accuracy of 0.1 mm and rotation accuracy of 0.15 degrees.
• Prospective correction effectively compensated for motion-induced artifacts.

Conclusions:

• The proposed in-bore optical motion tracking system offers a viable solution for real-time head motion compensation in brain MRI.
• This technology has the potential to significantly improve the quality and diagnostic utility of MRI scans.