Experimental demonstration of improved magnetorelaxometry imaging performance using optimized coil configurations.

Area of Science:

• Biomedical Imaging
• Medical Physics
• Nanotechnology

Background:

• Magnetorelaxometry imaging (MI) reconstructs magnetic nanoparticle distributions noninvasively.
• MI is promising for monitoring therapies like magnetic drug targeting and hyperthermia.
• Optimizing MI systems is crucial for clinical translation and accurate nanoparticle distribution reconstruction.

Purpose of the Study:

• To experimentally validate theoretical findings on optimized coil configurations for magnetorelaxometry imaging.
• To demonstrate the technical feasibility and improved reconstruction accuracy of optimized coil setups.
• To bridge the gap between simulation-based optimization and practical experimental results.

Main Methods:

• Optimized electromagnetic coil positions and radii for cuboidal and cylindrical MI setups by minimizing system matrix condition numbers.
• Manufactured optimized coil configurations alongside regular coil grids.
• Conducted MI measurements on nanoparticle phantoms and compared reconstruction qualities.

Main Results:

• Optimized configurations showed system matrix condition numbers approximately one order of magnitude lower than regular grids.
• Reconstruction accuracy for all phantoms was superior with optimized configurations in both setups.
• Optimized magnetorelaxometry imaging setups exhibited enhanced signal qualities.

Conclusions:

• Experimental validation of optimizing MI systems via system matrix condition number minimization.
• Demonstrated practicality and efficacy of optimized coil configurations in real-world settings.
• Minimizing system matrix condition number is a viable strategy for further MI system optimization, aiding clinical application.