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Cheishvili, K. (author), Kalkman, J. (author)We have implemented number fluctuation dynamic light scattering optical coherence tomography (OCT) for measuring extremely slow, sub-diffusion flows of dilute particle suspensions using the second-order autocovariance function. Our method has a lower minimum measurable velocity than conventional correlation-based OCT or phase-resolved Doppler...journal article 2023
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Cheishvili, K. (author), Kalkman, J. (author)We show scanning dynamic light scattering optical coherence tomography (OCT) omnidirectional flow measurements. Our method improves the velocity measurement limit over conventional correlation-based or phase-resolved Doppler OCT by more than a factor of 2. Our technique is applicable without a-priori knowledge of the flow geometry as our...journal article 2022
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Sewalt, E.J.G. (author), Kalkman, J. (author), van Ommen, J.R. (author), Meesters, G.M.H. (author), van Steijn, V. (author)Properties of powders produced from drying solute-containing droplets arise from the dynamic redistribution of solute during drying. While insights on the dynamic redistribution are instrumental for the rational design of powders and for the optimized operation of equipment such as spray dryers, experimental techniques that allow measuring...journal article 2022
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de Wit, J. (author), Angelopoulos, Kostas (author), Kalkman, J. (author), Glentis, George Othon (author)Spectral-estimation OCT (SE-OCT) is a computational method to enhance the axial resolution beyond the traditional bandwidth limit. However, it has not yet been used widely due to its high computational load, dependency on user-optimized parameters, and inaccuracy in intensity reconstruction. In this study, we implement SE-OCT using a fast...journal article 2021
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Ghafaryasl, B. (author), VERMEER, KOENRAAD A. (author), Kalkman, J. (author), Dore-Callewaert, T.W.J. (author), DE BOER, JOHANNES F. (author), van Vliet, L.J. (author)Optical properties, such as the attenuation coefficients of multi-layer tissue samples, could be used as a biomarker for diagnosis and disease progression in clinical practice. In this paper, we present a method to estimate the attenuation coefficients in a multi-layer sample by fitting a single scattering model for the OCT signal to the...journal article 2021
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Balasubramani, Vinoth (author), Kujawińska, Małgorzata (author), Allier, Cédric (author), Anand, Vijayakumar (author), Cheng, Chau Jern (author), Depeursinge, Christian (author), Hai, Nathaniel (author), Kalkman, J. (author), Park, Yong Keun (author)Quantitative Phase Imaging (QPI) provides unique means for the imaging of biological or technical microstructures, merging beneficial features identified with microscopy, interferometry, holography, and numerical computations. This roadmap article reviews several digital holography-based QPI approaches developed by prominent research groups....review 2021
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van der Horst, J. (author), Trull, A.K. (author), Kalkman, J. (author)In vivo imaging of small animals is of wide interest to the biomedical community studying biological disease and developmental processes. However, optical imaging deep in tissue is severely limited by light scattering, posing restrictions on the imaging depth, image contrast, and spatial resolution. We demonstrate optical coherence projection...journal article 2020
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van Rooij, J. (author), Kalkman, J. (author)We demonstrate large scale polarization contrast optical diffraction tomography (ODT). In cross-polarized sample arm detection configuration we determine, from the amplitude of the optical wavefield, a relative measure of the birefringence projection. In parallel-polarized sample arm detection configuration we image the conventional phase...journal article 2020
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de Wit, J. (author), Tonn, Sebastian (author), van den Ackerveken, Guido (author), Kalkman, J. (author)Optical coherence tomography (OCT) can be a valuable imaging tool for in vivo and label-free digital plant phenotyping. However, for imaging leaves, air-filled cavities limit the penetration depth and reduce the image quality. Moreover, up to now quantification of leaf morphology with OCT has been done in one-dimensional or two-dimensional...journal article 2020
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Dore-Callewaert, T.W.J. (author), Guo, Jerry Jinfeng (author), Harteveld, G.I. (author), Vandivere, Abbie (author), Dik, J. (author), Eisemann, E. (author), Kalkman, J. (author)We demonstrate multi-scale multi-parameter optical coherence tomography (OCT) imaging and visualization of Johannes Vermeer’s painting Girl with a Pearl Earring. Through automated acquisition, OCT image segmentation, and 3D volume stitching we realize OCT imaging at the scale of an entire painting. This makes it possible to image, with...journal article 2020
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Ghafaryasl, B. (author), Vermeer, Koenraad A. (author), Kalkman, J. (author), Dore-Callewaert, T.W.J. (author), Boer, Johannes F.D.E. (author), van Vliet, L.J. (author)The attenuation coefficient (AC) is an optical property of tissue that can be estimated from optical coherence tomography (OCT) data. In this paper, we aim to estimate the AC accurately by compensating for the shape of the focused beam. For this, we propose a method to estimate the axial PSF model parameters and AC by fitting a model for an...journal article 2020
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van Rooij, J. (author), Kalkman, J. (author)In this work we demonstrate large-scale high-sensitivity optical diffraction tomography (ODT) of zebrafish. We make this possible by three improvements. First, we obtain a large field of view while still maintaining a high resolution by using a high magnification over numerical aperture ratio digital holography set-up. With the inclusion of...journal article 2019
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Ghafaryasl, B. (author), Vermeer, K.A. (author), Kalkman, J. (author), Dore-Callewaert, T.W.J. (author), de Boer, J.F. (author), van Vliet, L.J. (author)The attenuation coefficient (AC) is a property related to the microstructure of tissue on a wavelength scale that can be estimated from optical coherence tomography (OCT) data. Since the OCT signal sensitivity is affected by the finite spectrometer/detector resolution called roll-off and the shape of the focused beam in the sample arm,...conference paper 2018
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- van der Horst, J. (author), Trull, A.K. (author), Kalkman, J. (author) conference paper 2018
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Trull, A.K. (author), van der Horst, J. (author), van Vliet, L.J. (author), Kalkman, J. (author)We present a comparison of image reconstruction techniques for optical projection tomography. We compare conventional filtered back projection, sinogram filtering using the frequency–distance relationship (FDR), image deconvolution, and 2D point-spread-function-based iterative reconstruction. The latter three methods aim to remove the spatial...journal article 2018
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Taballione, Caterina (author), Agbana, T.E. (author), Vdovine, G.V. (author), Hoekman, Marcel (author), Wevers, Lennart (author), Kalkman, J. (author), Verhaegen, M.H.G. (author), van der Slot, Peter J.M. (author), Boller, Klaus-Jochen (author)Wavelength meters are central for many applications such as in telecommunication systems or laser monitoring. The primary function of a wavelength meter is to provide an output signal that changes sensitively with the wavelength of the input light. Of central importance is the reproducibility of the output signal even in the presence of external...conference paper 2017
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Dore-Callewaert, T.W.J. (author), Dik, J. (author), Kalkman, J. (author)In this paper we present a novel method for the segmentation of thin corrugated layers in high resolution optical coherence tomography (OCT) images. First, we make an initial segmentation, for example with graph based segmentation that, for highly corrugated interfaces, leads to many segmentation errors. Second, we resegment the initial...journal article 2017
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Trull, A.K. (author), van der Horst, J. (author), Palenstijn, W.J. (author), van Vliet, L.J. (author), van Leeuwen, Tristan (author), Kalkman, J. (author)As a result of the shallow depth of focus of the optical imaging system, the use of standard filtered back projection in optical projection tomography causes space-variant tangential blurring that increases with the distance to the rotation axis. We present a novel optical tomographic image reconstruction technique that incorporates the point...journal article 2017
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- Taballione, C. (author), Agbana, T.E. (author), Vdovin, Gleb (author), Hoekman, M (author), Wevers, L. (author), Kalkman, J. (author), Verhaegen, M.H.G. (author), van der Slot, P.J.M. (author), Boller, KJ (author) conference paper 2017
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- Kalkman, J. (author) journal article 2017
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