Articles from Andrzej Kowalczyk

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  1. Fuchs’ Endothelial Dystrophy in 830-nm Spectral Domain Optical Coherence Tomography

    Explore Article Ophthalmic Surgery, Lasers and Imaging (Sep 10 2008) Ophthalmology

    This article presents for the first time the potential of 830-nm spectral domain optical coherence tomography (SD-OCT) in the evaluation of Fuchs’ endothelial dystrophy. SD-OCT is an imaging technique that can be used for in vivo cross-sectional corneal visualization. The important features of SD-OCT instruments include improved sensitivity and short acquisition time, which improves the quality of the tomograms compared with conventional time domain OCT. Tomograms of the corneas of ... (Read Full Article)

    Comment on Article Mentions:   Maciej Wojtkowski   Nicolaus Copernicus University   Andrzej A. Kowalczyk

  2. Analysis of the Outer Retina Reconstructed by High-resolution, Three-dimensional Spectral Domain Optical Coherence Tomography

    Explore Article Ophthalmic Surgery, Lasers and Imaging (Sep 10 2008) Ophthalmology

    BACKGROUND AND OBJECTIVE A retrospective cross-sectional study was conducted to demonstrate an analysis of an outer retinal layer reconstructed by the three-dimensional and high-speed spectral domain optical coherence tomography (SD-OCT) instrument. PATIENTS AND METHODS New measurement protocols for SD-OCT and methods of analysis and visualization of the individual segmented retinal layer reconstructed by SD-OCT were proposed. Three contour maps representing mutual distances between the basal part of the retinal pigment ... (Read Full Article)

    Comment on Article Mentions:   University of Pittsburgh   Massachusetts Institute of Technology   James G. Fujimoto

  3. Granular Corneal Dystrophy in 830-nm Spectral Optical Coherence Tomography.

    Explore Article Cornea (Jul 23 2008) Ophthalmology

    Page: 830DOI: 10.1097/ICO.0b013e31816be90fAuthors: Kaluzny, Bartlomiej J PhD; Szkulmowska, Anna MSc; Szkulmowski, Maciej MSc; Bajraszewski, Tomasz MSc; Wawrocka, Anna MSc; Krawczynski, Maciej R PhD; Kowalczyk, Andrzej PhD; Wojtkowski, Maciej PhD (Read Full Article)

    Comment on Article Mentions:   Nicolaus Copernicus University   Maciej Wojtkowski   Andrzej A. Kowalczyk

  4. Correlation of Spectral Optical Coherence Tomography with Fluorescein and Indocyanine Green Angiography in Multiple Evanescent White Dot Syndrome

    Explore Article BJO Online (Jul 8 2008) Ophthalmology

    Aims: To determine spatial location of lesions in Multiple Evanescent White Dot Syndrome (MEWDS) with the aid of spectral optical coherence topography (SOCT), fluorescein angiography (FA) and indocyanine green angiography (ICGA). Methods: A novel method of three-dimensional SOCT data analysis called reflectivity maps was introduced. The reflectivity maps display the distribution of a back-reflected intensity taken only from individual retinal layers located at specific distance from the reference plane. Reflectivity ... (Read Full Article)

    Comment on Article Mentions:   Maciej Wojtkowski   Nicolaus Copernicus University   Maciej Szkulmowski

  5. Phase-resolved Doppler optical coherence tomography—limitations and improvements

    Explore Article opticsinfobase.org (Jun 18 2008)

    Anna Szkulmowska, Maciej Szkulmowski, Andrzej Kowalczyk, Maciej WojtkowskiWe describe how the simple phase difference averaging causes a systematic bias in the velocity estimation obtained by phase-resolved Fourier domain optical coherence tomography (FdOCT). The magnitude of this bias depends on the signal-to-noise ratio as well as proximity of the measured velocity to ... [Opt. Lett. 33, 1425-1427 (2008)] (Read Full Article)

    Comment on Article Mentions:   Anna Szkulmowska   Maciej Szkulmowski   Maciej Wojtkowski

  6. Flow velocity estimation using joint Spectral and Time domain Optical Coherence Tomography

    Explore Article opticsinfobase.org (Apr 14 2008) Ophthalmology

    Maciej Szkulmowski, Anna Szkulmowska, Tomasz Bajraszewski, Andrzej Kowalczyk, Maciej Wojtkowski We propose a modified method of acquisition and analysis of Spectral Optical Coherence Tomography (SOCT) data to provide information about flow velocities. The idea behind this method is to acquire a set of SOCT spectral fringes dependent on time followed by a numerical analysis using two ... [Opt. Express 16, 6008-6025 (2008)] (Read Full Article)

    Comment on Article Mentions:   Maciej Wojtkowski   Tomasz Bajraszewski   Anna Szkulmowska

  7. Optical coherence tomography in art diagnostics and restoration

    Explore Article SpringerLink Home (Mar 21 2008) Art

    An overview of the technique of optical coherence tomography (OCT) is presented, and a spectral OCT instrument especially designed for art diagnostics is described. The applicability of OCT to the stratigraphy of oil paintings is discussed with emphasis on examination of the artist’s signature. For the first time, OCT tomograms of stained glass are presented and discussed. The utilisation of Spectral OCT in real-time monitoring of varnish ablation is discussed ... (Read Full Article)

    Comment on Article Mentions:   Nicolaus Copernicus University   Andrzej A. Kowalczyk   Piotr Targowski

  8. Improved spectral optical coherence tomography using optical frequency comb

    Explore Article opticsinfobase.org (Mar 12 2008)

    Tomasz Bajraszewski, Maciej Wojtkowski, Maciej Szkulmowski, Anna Szkulmowska, Robert Huber, Andrzej Kowalczyk. We identify and analyze factors influencing sensitivity drop-off in Spectral OCT and propose a system employing an Optical Frequency Comb (OFC) to verify this analysis. Spectral Optical Coherence Tomography using a method based on an optical frequency comb is demonstrated. Since the spectrum ... [Opt. Express 16, 4163-4176 (2008)] (Read Full Article)

    Comment on Article Mentions:   Maciej Wojtkowski   Robert Huber   Tomasz Bajraszewski

  9. Simultaneous analysis of extinction and flow velocity with joint spectral and time domain OCT

    Explore Article SPIE Digital Library (Feb 18 2008)

    Maciej Wojtkowski, Maciej Szkulmowski, Tomasz Bajraszewski et al. In this contribution we propose a new method of acquisition and analysis of Spectral Optical Coherence Tomography data to obtain information about depth dependent extinction in the scattering media. In joint Spectral and Time domain OCT a set of Spectral Optical Coherence Tomography fringes is acqui ... [Proc. SPIE Int. Soc. Opt. Eng. 6847, 68471M (2008)] published Mon Feb 18, 2008. (Read Full Article)

    Comment on Article Mentions:   Maciej Wojtkowski   Tomasz Bajraszewski   Maciej Szkulmowski

  10. Flow velocity analysis with joint spectral and time domain OCT

    Explore Article SPIE Digital Library (Feb 18 2008)

    Maciej Szkulmowski, Maciej Wojtkowski, Anna Szkulmowska et al. We propose a new method of acquisition and analysis of Spectral Optical Coherence Tomography data. The method acquires a set of SOCT spectral fringes as a function of time. The Fourier analysis of such data allows for investigation of various functional aspects of analyzed tissue. We show that Doppl ... [Proc. SPIE Int. Soc. Opt. Eng. 6847, 68471K (2008)] published Mon Feb ... (Read Full Article)

    Comment on Article Mentions:   Maciej Wojtkowski   Anna Szkulmowska

  11. Spectral Optical Coherence Tomography in Video-Rate and 3D Imaging of Contact Lens Wear

    Explore Article Optometry and Vision Science (Feb 15 2008) Ophthalmology

    Optometry & Vision Science. 84(12):E1104-E1109, December 2007. KALUZNY, BARTLOMIEJ J. MD, PhD; FOJT, WOJCIECH Dipl Ing; SZKULMOWSKA, ANNA MSc; BAJRASZEWSKI, TOMASZ MSc; WOJTKOWSKI, MACIEJ PhD; KOWALCZYK, ANDRZEJ PhD Abstract: Purpose. To present the applicability of spectral optical coherence tomography (SOCT) for video-rate and three-dimensional imaging of a contact lens on the eye surface. Methods. The SOCT prototype instrument constructed at Nicolaus Copernicus University (Torun, Poland) is b (Read Full Article)

    Comment on Article Mentions:   Nicolaus Copernicus University   Andrzej A. Kowalczyk   Tomasz Bajraszewski

  12. Retinal blood flow analysis using joint spectral and time domain optical coherence tomography

    Explore Article SPIE Digital Library (Feb 11 2008) Ophthalmology

    Anna Szkulmowska, Maciej Szkulmowski, Tomasz Bajraszewski et al. We propose a new technique of measuring and analysis of OCT signals: joint Spectral and Time domain Optical Coherence Tomography (STdOCT). This technique is based on a multiple spectral interferogram registration in time increments. The analysis of a single spectral interferogram provides an axial s ... [Proc. SPIE Int. Soc. Opt. Eng. 6844, 68440K (2008)] published Mon Feb 11, 2008. (Read Full Article)

    Comment on Article Mentions:   Tomasz Bajraszewski   Maciej Szkulmowski   Anna Szkulmowska

  13. Optical coherence tomography for varnish ablation monitoring

    Explore Article SPIE Digital Library (Jul 16 2007) Art

    Optical Coherence Tomography (OCT) is a new, fast-growing technique for non-contact and non-destructive imaging of semi-transparent objects. It has been recently used for diverse applications in art conservation subject - among others it is very well suited for varnish layer imaging and thus for monitoring of varnish removing process, including the laser ablation. In this study we show how to use the OCT technique to obtain the information required for ... (Read Full Article)

    Comment on Article Mentions:   Nicolaus Copernicus University   Andrzej A. Kowalczyk   Piotr Targowski

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