Spectral Radar

Lindner, Michael W.; Andretzky, Peter; Kiesewetter, F.; Häusler, Gerd

doi:10.1201/b14024-13

Cited by 9 publications

(5 citation statements)

References 17 publications

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“…The technique described so far, also called 'spectral radar', has been implemented in free-space optics LCI (Fercher et al 1995) for the measurement of intraocular distances as well as in fibre optics OCT (Häusler and Lindner 1998) to obtain tomograms of human skin and the structure of multilayered printed circuit boards (Lindner et al 2002). Zuluaga and Richards-Kortum (1999) presented a parallel Fourier-domain OCT technique using an imaging spectrograph to obtain spatially resolved spectra.…”

Section: Spectral Interferometry Fourier-domain Octmentioning

confidence: 99%

Optical coherence tomography - principles and applications

et al. 2003

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We consider the use of single-photon counting detectors in coherence-domain imaging. Detectors operated in this mode exhibit reduced noise, which leads to increased sensitivity for weak light sources and weakly reflecting samples. In particular, we experimentally demonstrate the possibility of using superconducting single-photon detectors (SSPDs) for optical coherence-domain reflectometry (OCDR). These detectors are sensitive over the full spectral range that is useful for carrying out such imaging in biological samples. With counting rates as high as 100 MHz, SSPDs also offer a high rate of data acquisition if the light flux is sufficient.

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Section: Spectral Interferometry Fourier-domain Octmentioning

confidence: 99%

Optical coherence tomography - principles and applications

et al. 2003

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“…It should also be possible to use a monochromator and broadband light source; however, the spectral intensity of the monochromatic light may be too low for imaging in highly scattering media if only a single conventional SLD were used. FD-OCT is also known as spectral domain OCT (SD-OCT), frequency domain OCT and spectral radar (Lindner et al 2002). Throughout this paper, OCT performed in the frequency domain is referred to as FD-OCT to avoid confusion with the functional modality, spectroscopic OCT (S-OCT) that is used to perform three dimensional spectroscopy in both the time (Morgner et al 2000) and frequency (Leitgeb et al 2000) domains.…”

Section: Fourier-domain Octmentioning

confidence: 99%

Theory, developments and applications of optical coherence tomography

Tomlins

Wang

2005

J. Phys. D: Appl. Phys.

563

375

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In this paper, we review the developments in optical coherence tomography (OCT) for three-dimensional non-invasive imaging. A number of different OCT techniques are discussed in some detail including time-domain, frequency-domain, full-field, quantum and Doppler OCT. A theoretical treatment is given and some relevant comparisons made between various implementations. The current and potential applications of OCT are discussed, with close attention paid to biomedical imaging and its metrological issues.

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“…Based on the specifications of the swept-source laser used in our system, simulated interferograms for a single scatterer in a medium with a refractive index of 1.38 were generated using Matlab 2021a (MathWorks ® , Natick, MA, USA). Considering the spectral intensity distribution of the swept-source laser 𝑆(𝑘) and that the refractive index 𝑛 was constant with depth, the simulated interference signals 𝐼(𝑘) were generated as [22]:…”

Section: Numerical Simulationsmentioning

confidence: 99%

Phase-Resolved Optical Coherence Elastography: An Insight into Tissue Displacement Estimation

Batista

Serranho

Santos

et al. 2023

Sensors

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Robust methods to compute tissue displacements in optical coherence elastography (OCE) data are paramount, as they play a significant role in the accuracy of tissue elastic properties estimation. In this study, the accuracy of different phase estimators was evaluated on simulated OCE data, where the displacements can be accurately set, and on real data. Displacement (∆d) estimates were computed from (i) the original interferogram data (Δφori) and two phase-invariant mathematical manipulations of the interferogram: (ii) its first-order derivative (Δφd) and (iii) its integral (Δφint). We observed a dependence of the phase difference estimation accuracy on the initial depth location of the scatterer and the magnitude of the tissue displacement. However, by combining the three phase-difference estimates (Δdav), the error in phase difference estimation could be minimized. By using Δdav, the median root-mean-square error associated with displacement prediction in simulated OCE data was reduced by 85% and 70% in data with and without noise, respectively, in relation to the traditional estimate. Furthermore, a modest improvement in the minimum detectable displacement in real OCE data was also observed, particularly in data with low signal-to-noise ratios. The feasibility of using Δdav to estimate agarose phantoms’ Young’s modulus is illustrated.

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Spectral Radar

Cited by 9 publications

References 17 publications

Optical coherence tomography - principles and applications

Optical coherence tomography - principles and applications

Theory, developments and applications of optical coherence tomography

Phase-Resolved Optical Coherence Elastography: An Insight into Tissue Displacement Estimation

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