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Computed Tomography-guided Time-domain Diffuse Fluorescence Tomography in Small Animals for Localization of Cancer Biomarkers
Published on: July 17, 2012
Experimental measurement of time-dependent photon scatter for diffuse optical tomography
Niksa Valim1, James Brock, Mark Niedre
1Northeastern University, Department of Electrical and Computer Engineering, Dana Research Center, Boston, MA, USA.
Journal of Biomedical Optics
|January 5, 2011
Summary
Measuring early photons significantly reduces light scatter in biological tissue, improving imaging. Optimal detection occurs at the 10% intensity point, balancing scatter reduction and instrument noise for better results.
Area of Science:
- Biomedical Optics
- Photonics
- Medical Imaging
Background:
- Light scatter in biological tissue limits imaging depth and resolution.
- Time-resolved detection of early photons is a promising method to mitigate scattering.
- The impact of time-gated detection on scatter reduction and noise is not fully understood.
Purpose of the Study:
- Quantify the reduction in photon scatter using time-gated detection.
- Evaluate the effect of time-gated detection on instrument noise performance.
- Determine the optimal operating point for time-resolved measurements in biological tissue.
Main Methods:
- Time-dependent photon density sensitivity functions (PDSFs) were measured.
- Time-correlated single-photon counting was employed.
- Time-dependent Monte Carlo simulations and diffusion approximation modeled photon propagation.
Main Results:
- Early arriving photons reduced PDSF full width half maximum by 40-60% compared to quasicontinuous wave photons.
- This corresponds to a 64-84% reduction in PDSF volume.
- The optimal operating point was identified at the 10% rising edge of the transmitted intensity curve.
Conclusions:
- Time-gated detection of early photons effectively reduces light scatter in diffusive media.
- The findings provide crucial data for optimizing time-resolved imaging systems.
- Optimal instrument performance balances scatter reduction with noise considerations.
