Articles that mention Jeroen Kalkman -Optical Coherence Tomography News

Jeroen Kalkman

0 Comments Leave a Comment

1-15 of 40 1 2 3 »
1. Mentioned In 40 Articles
2. Analysis of attenuation coefficient estimation in Fourier-domain OCT of semi-infinite media
  
  Explore OSA | OSA Publishing Dec 8 2020
  
  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 OCT signal in a homogenous sample to the recorded OCT ...
  Read Full Article
  
  Comment
  
  Mentions: Johannes F. de Boer Jeroen Kalkman Delft University of Technology
3. Researchers peer deep inside tissue with new high-resolution techniques
  
  Explore PhysOrg.com Dec 1 2020
  
  ...iod of time is scattered through the tissue and arrives at the detector relatively late," TU Delft researcher Jeroen Kalkman explains. "Usually, this causes the resulting images to be blurred. But by looking at the arriv...
  Read Full Article
  
  Comment
  
  Mentions: Jeroen Kalkman Delft University of Technology
4. Deep-tissue label-free quantitative optical tomography
  
  Explore OSA | OSA Publishing Nov 30 2020
  
  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 tomography (OCPT) as a fast three-dimensional optical imaging technique for ballistic, non-scattered light, deep-tissue imaging. OCPT is based on a novel scanning ...
  Read Full Article
  
  Comment
  
  Mentions: Jeroen Kalkman Delft University of Technology
5. Quantification of plant morphology and leaf thickness with optical coherence tomography
  
  Explore OSA | OSA Publishing Nov 16 2020 NDE/NDT
  
  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 images only, and has often been limited to relative measurements. In this paper, we demonstrate a significant increase in OCT ...
  Read Full Article
  
  Comment
  
  Mentions: Thorlabs Jeroen Kalkman Delft University of Technology
6. Multi-scale optical coherence tomography imaging and visualization of Vermeer’s Girl with a Pearl Earring
  
  Explore OSA | OSA Publishing Aug 24 2020 Art
  
  We demonstrate multi-scale multi-parameter optical coherence tomography (OCT) imaging and visualization of Johannes Vermeers 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 micrometer axial and lateral resolution, an entire painting over more than 5 orders of length scale. From the multi-scale OCT data we ...
  Read Full Article
  
  Comment
  
  Mentions: Jeroen Kalkman Delft University of Technology
7. Optical coherence computed tomography for quantitative 3D imaging of adult zebrafish
  
  Explore SPIE Digital Library Mar 20 2018 Developmental Biology
  
  Optical imaging in turbid media like biological tissue is limited by light scattering. We present optical coherence computed tomography (OCCT) as a novel optical imaging modality for ballistic 3D optical imaging of turbid media. In OCCT, coherence and confocal gated measurements from multiple lateral positions and angles are used to reconstruct quantitative 3D images of the optical attenuation and refractive index with tomographic reconstruction algorithms. OCCT allows for high resolution ...
  Read Full Article
  
  Comment
  
  Mentions: Jeroen Kalkman Delft University of Technology
8. Fourier-Domain Optical Coherence Tomography Signal Analysis and Numerical Modeling
  
  Explore Hindawi Publishing Corporation Jan 28 2018
  
  In this work the theory of the optical coherence tomography (OCT) signal after sampling, in dispersive media, with noise, and for a turbid medium is presented. The analytical theory is demonstrated with a one-dimensional numerical OCT model for (single) reflectors, dispersive media, and turbid media. For dispersive media the deterioration of the OCT axial resolution is quantified analytically and numerically. The OCT signal to noise ratio (SNR) is analyzed in ...
  Read Full Article
  
  Comment
  
  Mentions: Jeroen Kalkman Delft University of Technology
9. Optimization-based adaptive optics for optical coherence tomography (Thesis)
  
  Explore TU Delft Institutional Repository Mar 17 2017 Student Theses
  
  Optical coherence tomography (OCT) is a technique for non-invasive imaging based on low coherence interferometry. Its main application is found in ophthalmology, where it is used for 3D in vivo imaging of the cornea and the retina. OCT has evolved over the past decade as one of the most important ancillary tests in ophthalmic practice, providing great diagnostic value for disease screening and monitoring. In retinal OCT imaging, the lateral ...
  Read Full Article
  
  Comment
  
  Mentions: Jeroen Kalkman Delft University of Technology
10. The amplitude and the phase or: Measuring directional and random motion with optical coherence tomography (Thesis)
  
  Explore UvA DARE Dec 13 2016 Student Theses
  
  Optical coherence tomography (OCT) uses a low coherence light source and a Michelson interferometer to measure path-length resolved backscatter profiles of samples with micrometer resolution and up to a few millimeters long. The OCT amplitude is typically used to generate images of the sample. Additionally, the amplitude and the phase of the OCT signal can be used to extract quantitative sample information such as layer thickness, refractive index, and flow ...
  Read Full Article
  
  Comment
  
  Mentions: Jeroen Kalkman Ton G. van Leeuwen
11. Measurement of biofilm growth and local hydrodynamics using optical coherence tomography
  
  Explore OSA | OSA Publishing Aug 17 2016
  
  We report on localized and simultaneous measurement of biofilm growth and local hydrodynamics in a microfluidic channel using optical coherence tomography. We measure independently with high spatio-temporal resolution the longitudinal flow velocity component parallel to the imaging beam and the transverse flow velocity component perpendicular to the imaging beam. Based on the measured velocities we calculate the shear-rates in the flow channel. We show the relation between the measured biofilm ...
  Read Full Article
  
  Comment
  
  Mentions: Academic Medical Center at the University of Amsterdam Jeroen Kalkman Ton G. van Leeuwen
12. "Transmission Optical Coherence Tomography Sensing" - Presented by Jeroen Kalkman, TU Delft
  
  Explore healthtechevent.com Apr 13 2016
  
  ... in water over the spectral bandwidth. Applications in the food, dairy, oil, medical field are presented. Dr. Jeroen Kalkman has a strong expertise in the area of optical coherence tomography (OCT) with more than 17 pape...
  Read Full Article
  
  Comment
  
  Mentions: Leiden University Jeroen Kalkman Delft University of Technology
13. Transmission optical coherence tomography based measurement of optical material properties
  
  Explore OSA | OSA Publishing Dec 26 2015
  
  We present transmission optical coherence tomography (transmission OCT) as a versatile tool to measure optical material properties of turbid media. The transmission OCT signal is described in detail and it is demonstrated how the group refractive index ( n g ), group velocity dispersion (GVD) and optical attenuation can be determined from this signal. We experimentally validate the refractive index properties of glasses, liquids and glucose water solutions in terms of n ...
  Read Full Article
  
  Comment
  
  Mentions: Jeroen Kalkman Delft University of Technology
14. Model-based sensor-less wavefront aberration correction in optical coherence tomography
  
  Explore OSA | OSA Publishing Dec 13 2015
  
  Several sensor-less wavefront aberration correction methods that correct nonlinear wavefront aberrations by maximizing the optical coherence tomography (OCT) signal are tested on an OCT setup. A conventional coordinate search method is compared to two model-based optimization methods. The first model-based method takes advantage of the well-known optimization algorithm (NEWUOA) and utilizes a quadratic model. The second model-based method (DONE) is new and utilizes a random multidimensional Fourier-basis expansion. The model-based ...
  Read Full Article
  
  Comment
  
  Mentions: Jeroen Kalkman Delft University of Technology
15. Simultaneous and localized measurement of diffusion and flow using optical coherence tomography
  
  Explore opticsinfobase.org Feb 4 2015
  
  ...n G. van Leeuwen, and Jeroen Kalkman »View Author Affiliations Nicolás Weiss,^1,^* Ton G. van Leeuwen,^1 and Jeroen Kalkman^2 ^1Biomedical Engineering & Physics, Academic Medical Center, University of Amsterdam, PO Bo...
  Read Full Article
  
  Comment
  
  Mentions: Jeroen Kalkman Delft University of Technology Ton G. van Leeuwen
16. Towards model-based adaptive optics optical coherence tomography
  
  Explore opticsinfobase.org Dec 23 2014 Microscopy
  
  ...d: December 23, 2014 Citation Hans R. G. W. Verstraete, Barry Cense, Rolf Bilderbeek, Michel Verhaegen, and Jeroen Kalkman, "Towards model-based adaptive optics optical coherence tomography," Opt. Express 22, 32406-324...
  Read Full Article
  
  Comment
  
  Mentions: Jeroen Kalkman Barry Cense Delft University of Technology
17. 1-15 of 40 1 2 3 »