Frequency-domain imaging of thick tissues using a CCD

Todd E. French; Enrico Gratton; John S. Maier

doi:10.1117/12.58217

1 April 1992 Frequency-domain imaging of thick tissues using a CCD

Todd E. French, Enrico Gratton, John S. Maier

Proceedings Volume 1640, Time-Resolved Laser Spectroscopy in Biochemistry III; (1992) https://doi.org/10.1117/12.58217
Event: OE/LASE '92, 1992, Los Angeles, CA, United States

Abstract

Imaging of thick tissue has been an area of active research during the past several years. Among the methods proposed to deal with the high scattering of biological tissues, the time resolution of a short light probe traversing a tissue seems to be the most promising. Time resolution can be achieved in the time domain using correlated single photon counting techniques or in the frequency domain using phase resolved methods. We have developed a CCD camera system which provides ultra high time resolution on the entire field of view. The phase of the photon diffusion wave traveling in the highly turbid medium can be measured with an accuracy of about one degree at each pixel. The camera has been successfully modulated at frequencies on the order of 100 MHz. At this frequency, one degree of phase shift corresponds to about 30 ps maximum time resolution. Powerful image processing software displays in real time the phase resolved image on the computer screen.

Citation Download Citation

Todd E. French, Enrico Gratton, and John S. Maier "Frequency-domain imaging of thick tissues using a CCD", Proc. SPIE 1640, Time-Resolved Laser Spectroscopy in Biochemistry III, (1 April 1992); https://doi.org/10.1117/12.58217

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