Optical coherence tomography
Optical coherence tomography (OCT) utilizes techniques such as interferometry and coherence gating to obtain high-resolution tissue images. We develop OCT systems for biomedical and industrial applications.
OCT is the optical analogue of ultrasound. It detects the interference signal between the back scattered light from tissue and a reference arm. Depth resolution is achieved because the interference happens only when the pathlength of the reference arm matches with that of the sample arm. OCT can provide cross-sectional anatomical images of layered structures in tissues over a few millimeters deep. Functional OCT, such as optical Doppler OCT, can provide quantitative information about blood flow. OCT has been applied to study ophthalmologic, gastrointestinal, cardiovascular, and respiratory diseases.