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Quantitative diffuse optical tomography for small animals using an ultrafast gated image intensifier.

Sachin V Patwardhan¹, Joseph P Culver

¹Washington University School of Medicine, Department of Radiology, Mallinckrodt Institute of Radiology, St. Louis, Missouri 63110, USA.

Journal of Biomedical Optics

|March 5, 2008

Summary

Researchers developed a novel small animal diffuse optical tomography system. This system utilizes high modulation frequencies to improve quantitative accuracy in fluorescence and bioluminescence imaging by mapping in situ optical properties.

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Area of Science:

Biomedical optics
Medical imaging
Optical tomography

Background:

Quantitative accuracy in small animal imaging relies on in situ optical properties.
Current methods face challenges like short propagation distances and dense sampling requirements.

Purpose of the Study:

To develop an advanced small animal diffuse optical tomography (DOT) system.
To enhance the mapping of in situ optical properties for improved imaging accuracy.

Main Methods:

Utilized an ultrafast gated image intensifier and a pulsed laser source.
Implemented synthetic modulation frequencies exceeding 1 GHz.
Acquired amplitude and phase measurements across a wide frequency range (250-1250 MHz).

Main Results:

Demonstrated useful contrast-to-noise ratios for amplitude and phase measurements at high modulation frequencies.
Successfully reconstructed absorption and scattering optical properties using tissue-simulating phantoms.
Validated the feasibility of the developed DOT system for small animal imaging.

Conclusions:

The developed high-frequency DOT system significantly improves the potential for accurate in situ optical property mapping in small animals.
This advancement is crucial for enhancing quantitative accuracy in fluorescence and bioluminescence imaging.
The system shows promise for preclinical research applications requiring precise optical property determination.