Quantification and 3D Localization of Magnetically Navigated Superparamagnetic Particles Using MRI in Phantom and...

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Medical Imaging

Background:

• Superparamagnetic iron oxide nanoparticles (SPIONs) are utilized in magnetic drug-eluting beads (MDEBs) for targeted cancer therapy.
• Magnetic navigation within MRI scanners offers potential for precise delivery of MDEBs through the vascular system.

Purpose of the Study:

• To develop and validate a method for accurate quantification and localization of MDEBs using MRI.
• To assess the feasibility of magnetically steering MDEBs to specific regions within the body.

Main Methods:

• MDEBs composed of Fe3O4 SPIONs were created and characterized.
• Susceptibility artifacts in 3D VIBE MRI sequences were analyzed in phantoms and swine models.
• A linear volume relationship between MDEB artifacts and MDEB quantity was established.
• Magnetic-injection systems were used for in vivo MDEB steering and embolization.

Main Results:

• A robust linear volume relationship was identified between MDEB artifacts and MDEB quantity, independent of magnetic field orientation and sequence bandwidth.
• The method demonstrated high accuracy (≤ 8.8% error) in quantifying MDEB distribution.
• Successful magnetic steering of MDEBs to desired liver regions was achieved in a swine model.

Conclusions:

• MDEBs can be effectively steered to target locations using magnetic guidance.
• 3D VIBE MRI sequences coupled with artifact analysis provide accurate localization and quantification of MDEB distribution.
• This technique holds promise for image-guided, targeted delivery of cancer therapeutics.