A True Multi-modality Approach for High Resolution Optical Imaging: Photo-Magnetic Imaging

Area of Science:

• Biomedical Imaging
• Optical Imaging
• Magnetic Resonance Imaging

Background:

• Multi-modality imaging combines strengths of different systems for enhanced resolution and accuracy.
• Photo-Magnetic Imaging (PMI) is a novel technique providing quantitative optical absorption maps at MRI resolution.

Purpose of the Study:

• To present Photo-Magnetic Imaging (PMI) as a multi-modality imaging approach.
• To demonstrate PMI's capability for quantitative optical absorption mapping with high spatial resolution.
• To highlight PMI's potential for in vivo and clinical applications, particularly breast cancer imaging.

Main Methods:

• Utilizes laser illumination to induce localized tissue heating.
• Employs MR thermometry to measure laser-induced temperature variations with high spatial resolution.
• Applies a finite element-based inverse solver, modeling photon migration and heat diffusion, to convert temperature maps into tissue absorption maps.

Main Results:

• Demonstrated feasibility of PMI through phantom studies.
• Successfully reduced laser power to meet ANSI limits for safe in vivo imaging.
• Developing multi-wavelength imaging capability to resolve chromophores and exogenous contrast agents.

Conclusions:

• PMI is a viable multi-modality imaging technique offering quantitative optical absorption data at MRI resolution.
• PMI has been optimized for in vivo applications and is being expanded with multi-wavelength capabilities.
• PMI shows significant translational potential for applications such as breast cancer imaging.