Deep imaging of absorption and scattering features by multispectral multiple scattering low coherence interferometry.

Area of Science:

• Biomedical Optics
• Medical Imaging Technology
• Optical Coherence Tomography

Background:

• Conventional optical coherence tomography (OCT) has limited penetration depth for deep tissue imaging.
• Accurate clinical classification of burn injuries is challenging due to limited accuracy of current methods.
• Spectroscopic contrast is crucial for differentiating healthy and injured tissue, but is often limited by imaging depth.

Purpose of the Study:

• To develop and validate a novel frequency domain multispectral multiple scattering low coherence interferometry (ms2/LCI) technique.
• To demonstrate enhanced signal-to-noise ratio (SNR) and imaging depth compared to conventional OCT.
• To assess the potential of ms2/LCI for clinical applications, such as burn injury assessment.

Main Methods:

• Developed frequency domain ms2/LCI for deep imaging of absorption and scattering contrast.
• Utilized tissue-mimicking phantoms with human dermal tissue scattering properties.
• Compared ms2/LCI performance against a commercial OCT instrument using phantoms and in vivo rat skin.

Main Results:

• Achieved a 15.4 dB SNR improvement over conventional OCT at 1 mm imaging depth.
• Demonstrated ms2/LCI's capability for deep spectroscopic contrast imaging in a simulated partial-thickness burn phantom.
• Successfully imaged healthy rat skin in vivo, obtaining spectroscopic information beyond conventional OCT penetration limits.

Conclusions:

• ms2/LCI offers significantly enhanced SNR and penetration depth for biomedical imaging.
• The technique shows promise for improved clinical assessment of conditions like burn injuries.
• ms2/LCI provides deep spectroscopic information, surpassing the capabilities of conventional OCT.