A deep brain stimulation-conditioned RF coil for 3T MRI.

Area of Science:

• Medical Imaging
• Biomedical Engineering
• Neuroscience

Background:

• Deep brain stimulation (DBS) is a crucial therapy for neurological disorders.
• MRI is essential for monitoring DBS hardware and brain changes.
• High RF fields in MRI can cause dangerous heating of DBS implants.

Purpose of the Study:

• To develop and validate an MRI coil system for 3 Tesla imaging of DBS patients.
• To minimize radiofrequency (RF) specific absorption rate (SAR) near DBS implants.
• To maintain or improve image quality during DBS-conditioned MRI.

Main Methods:

• Constructed a rotatable, linearly polarized birdcage transmitter with a 32-channel receive array.
• Conducted bench-level tests (SNR maps, noise correlation, acceleration) and phantom experiments.
• Performed electromagnetic simulations and phantom studies comparing the new coil with a standard body coil for SAR and temperature reduction.

Main Results:

• The developed coil features a linear birdcage with a low electric field region aligned with DBS leads.
• A close-fit 32-channel receive array provided high SNR and advanced encoding capabilities.
• Electromagnetic simulations and phantom tests confirmed substantially reduced SAR and temperature near DBS implants compared to a circular polarized body coil.

Conclusions:

• The novel 3T MRI coil assembly effectively reduces heat generation at DBS implants.
• This DBS-conditioned imaging technology offers a safer approach for MRI in patients with these devices.
• The system balances safety improvements with high-quality imaging performance.