Imaging of oblique structures in scattering media by time-gated viewing and coherence imaging

Juergen Beuthan; Klaus Doerschel; Gerhard J. Mueller; Olaf Minet; B. Messer

doi:10.1117/12.154676

14 September 1993 Imaging of oblique structures in scattering media by time-gated viewing and coherence imaging

Juergen Beuthan, Klaus Doerschel, Gerhard J. Mueller, Olaf Minet, B. Messer

Proceedings Volume 1888, Photon Migration and Imaging in Random Media and Tissues; (1993) https://doi.org/10.1117/12.154676
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States

Abstract

Comparative measurements were undertaken in the imaging of oblique structures in scattering media. First, an experimental set-up is described for an optically switched ps-radar. Hereby, laser pulses with duration of 3 ps are used to illuminate the object and an optically switched Kerr-gate which is selecting the light pulses scattered by the object (blood-vessel-phantom). The power of the set-up is demonstrated by the identification of this phantom embedded in several kinds of human tissue. The depth of observation was found in the range of 2 mm to 5 mm. Second, the coherence imaging (CI) is a new technique for non-invasive cross-sectional imaging of biological structure based on low coherence interferometry. In a modified Mach- Zehnder-Interferometer we positioned a phantom (tray with intralipid solution with test structure inside). The transmitted photons were optically modulated. These marked `coherent photons' were detected during an on-dimensional scan through the test structure in the scattering media.

Citation Download Citation

Juergen Beuthan, Klaus Doerschel, Gerhard J. Mueller, Olaf Minet, and B. Messer "Imaging of oblique structures in scattering media by time-gated viewing and coherence imaging", Proc. SPIE 1888, Photon Migration and Imaging in Random Media and Tissues, (14 September 1993); https://doi.org/10.1117/12.154676

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