Spectrally resolved bioluminescence tomography using the reciprocity approach

Area of Science:

• Biomedical Imaging
• Optical Tomography
• Molecular Imaging

Background:

• Bioluminescence tomography (BLT) aims to visualize internal biological processes.
• Nonspectrally resolved BLT faces challenges with source uniqueness and accuracy.
• Accurate reconstruction of bioluminescent sources is crucial for preclinical research.

Purpose of the Study:

• To develop and validate spectrally resolved bioluminescence optical tomography (SR-BLOT).
• To address the uniqueness problem in intensity-based BLT.
• To improve the accuracy and efficiency of bioluminescent source reconstruction.

Main Methods:

• Utilized multiwavelength emission data from internal bioluminescence sources.
• Employed a non-negative constraint inverse algorithm for source distribution calculation.
• Applied the reciprocity approach for accelerated image reconstruction.

Main Results:

• Demonstrated accurate source distribution recovery from measured data.
• Achieved 0.5 mm accuracy in locating internal bioluminescence sources experimentally.
• Resolved small (2.5 mm diameter) deep sources (up to 12.5 mm) in a complex mouse model using single-view data.
• Reduced computational time from 402 to 3.75 hours with the reciprocity approach without compromising accuracy.

Conclusions:

• SR-BLOT overcomes uniqueness issues in intensity-based BLT.
• The method enables accurate localization and resolution of deep bioluminescent sources in complex biological models.
• The reciprocity approach significantly enhances computational efficiency for SR-BLOT, making it more practical for research.