A finite-element-based reconstruction method for 3D fluorescence tomography.

Area of Science:

• Biomedical Imaging
• Optical Imaging
• Molecular Imaging

Background:

• Three-dimensional fluorescence molecular tomography (3D-FMT) is crucial for in vivo molecular imaging.
• Accurate reconstruction of fluorescent yield and lifetime is essential for quantitative FMT.
• Existing FMT methods face challenges with ill-posedness and reconstruction accuracy.

Purpose of the Study:

• To propose a novel dual-excitation-mode methodology for 3D-FMT.
• To develop an effective reconstruction algorithm for fluorescent yield and lifetime.
• To address the ill-posed nature of FMT reconstruction.

Main Methods:

• A dual-excitation-mode approach combining steady-state and frequency-domain methods.
• Finite element techniques for reconstruction.
• Linear least squares minimization for fluorescent yield reconstruction.
• Optimization problem formulation for fluorescent lifetime reconstruction.

Main Results:

• Successful reconstruction of fluorescent yield and lifetime using the proposed algorithm.
• Demonstrated accuracy, stability, and favorable noise characteristics.
• Validated effectiveness using a heterogeneous mouse chest phantom.

Conclusions:

• The dual-excitation-mode methodology provides an effective solution for 3D-FMT.
• The developed algorithm overcomes ill-posedness and achieves accurate reconstruction.
• The method shows potential for improved molecular imaging applications.