Imaging through scattering media using spatial incoherence techniques

Abstract

Imaging of objects embedded in scattering media can be accomplished by sources with reduced spatial coherence instead of pulsed light or short temporal coherence light.

Depth-resolved holography through turbid media using photorefraction

“…It is more difficult with whole-field imaging techniques, however, because cross-talk can occur between adjacent pixels where weakly scattered photons interfere, resulting in competing holograms (or speckle). This problem is partially alleviated by spatial averaging across the image field and may be reduced by minimizing the coherence length or by introducing spatial incoherence across the image field e.g., [20]. Note that incoherent time-gated whole-field imaging techniques also suffer image degradation from cross-talk and, unlike coherent techniques, do not reject any of the scattered light that arrives within the detection time window.…”

Digital holographic microscopy for the three-dimensional dynamic analysis of in vitro cancer cell migration

“…22 Only a few implementations of partially spatial coherent sources in transmission digital holographic microscopes were reported. Based on a work by Leith et al, 23 and Indebetouw and Klysubun report that the spatiotemporal digital holography approach benefits from the partial spatial coherent source for imaging through a turbid media. 24 Although the transmission microscope mode is mentioned, the experimental demonstration is shown in a reflection case.…”

Study on signal-to-noise ratio of an object embedded in turbid media

“…The information on biological tissue can be obtained by analyzing the temporal or spatial statistical properties of diffuse light. Imaging bio-tissues with visible or infrared light has been studied for many years, time-resolved optical imaging 1 , frequency-domain optical imaging 2 , optical coherence tomography 3,4 , photoacoustic tomography 5 and ultrasound-modulated optical tomography 6,7 have been developed. Ultrasound-modulated optical tomography is an attractive means to study biological tissues non-invasively.…”