Single-shot cross-correlation system for longitudinal imaging in biological tissues

Emmanuel Abraham; Edouard Bordenave; Noriaki Tsurumachi; Gediminas Jonusauskas; Jean Oberle; Claude Rulliere

doi:10.1117/12.469787

4 June 2002 Single-shot cross-correlation system for longitudinal imaging in biological tissues

Emmanuel Abraham, Edouard Bordenave, Noriaki Tsurumachi, Gediminas Jonusauskas, Jean Oberle, Claude Rulliere

Proceedings Volume 4625, Clinical Diagnostic Systems: Technologies and Instrumentation; (2002) https://doi.org/10.1117/12.469787
Event: International Symposium on Biomedical Optics, 2002, San Jose, CA, United States

Abstract

In this communication, we propose a non-invasive imaging setup which does not require any lateral and longitudinal scanning over the sample. The idea is to image a line over the sample surface with a laser and to collect the photons backscattered by the sample surface and the internal structures. As a result, a single shot 2D image of the sample can be obtained, one axis representing a lateral coordinate and the other one the longitudinal coordinate, e.g. the depth of the sample. To collect the backscattered light from the sample, we use a femtosecond laser source and the potential of a classical single-shot autocorrelator to make a time-to-space conversion by use of non-collinear sum frequency generation in a nonlinear crystal. With this technique, we performed single shot longitudinal imaging of an ex vivo mouse ear and in vivo human skin with a 35 micrometers lateral and 15 micrometers depth resolution in tissues. Inside the mouse ear, the epidermis, dermis and cartilage have been observed. In the in vivo human skin, the stratum corneum, the epidermis and the dermis have been observed. Especially, the epidermal-dermal junction has been clearly revealed and the thickness of the epidermis has been measured.

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Emmanuel Abraham, Edouard Bordenave, Noriaki Tsurumachi, Gediminas Jonusauskas, Jean Oberle, and Claude Rulliere "Single-shot cross-correlation system for longitudinal imaging in biological tissues", Proc. SPIE 4625, Clinical Diagnostic Systems: Technologies and Instrumentation, (4 June 2002); https://doi.org/10.1117/12.469787

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KEYWORDS

Imaging systems

Skin

Tissues

Image resolution

Ear

Nonlinear crystals

Crystals

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