Articles from Maciej Wojtkowski

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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. Projection OCT fundus imaging for visualizing outer retinal pathology in non-exudative age related macular degeneration

    Explore Article BJO Online (Jul 27 2008) Ophthalmology

    Aims: To demonstrate ultrahigh resolution, three-dimensional optical coherence tomography (3D-OCT) and projection OCT fundus imaging for enhanced visualization of outer retinal pathology in non-exudative age related macular degeneration (AMD). Methods: A high-speed, ultrahigh 3.5 µm resolution OCT prototype instrument was developed for the ophthalmic clinic. 83 patients with non-exudative AMD were imaged. Projection OCT fundus images were generated from 3D-OCT data by selectively summing different retinal depth levels. Results were ... (Read Full Article)

    Comment on Article Mentions:   Massachusetts Institute of Technology   James G. Fujimoto   Maciej Wojtkowski

  4. 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

  5. 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

  6. 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

  7. Optical Coherence Tomography Scan Circle Location and Mean Retinal Nerve Fiber Layer Measurement Variability

    Explore Article iovs.org (May 29 2008) Ophthalmology

    purpose. To investigate the effect on optical coherence tomography (OCT) retinal nerve fiber layer (RNFL) thickness measurements of varying the standard 3.4-mm-diameter circle location. methods. The optic nerve head (ONH) region of 17 eyes of 17 healthy subjects was imaged with high-speed, ultrahigh-resolution OCT (hsUHR-OCT; 501 x 180 axial scans covering a 6 x 6-mm area; scan time, 3.84 seconds) for a comprehensive sampling. This method allows for systematic simulation ... (Read Full Article)

    Comment on Article Mentions:   Massachusetts Institute of Technology   James G. Fujimoto   Maciej Wojtkowski

  8. 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

  9. Characterization of outer retinal morphology with high-speed, ultrahigh-resolution optical coherence tomography.

    Explore Article NCBI HomePage (Apr 4 2008) Ophthalmology

    Characterization of outer retinal morphology with high-speed, ultrahigh-resolution optical coherence tomography. Invest Ophthalmol Vis Sci. 2008 Apr;49(4):1571-9 Authors: Srinivasan VJ, Monson BK, Wojtkowski M, Bilonick RA, Gorczynska I, Chen R, Duker JS, Schuman JS, Fujimoto JG PURPOSE: To visualize, quantitatively assess, and interpret outer retinal morphology by using high-speed, ultrahigh-resolution (UHR) OCT. METHODS: Retinal imaging was performed in the ophthalmic clinic in a cross-section of 43 normal subjects with a ... (Read Full Article)

    Comment on Article Mentions:   Massachusetts Institute of Technology   Jay S. Duker   Joel S. Schuman

  10. 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

  11. 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

  12. 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

  13. 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

  14. 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

  15. Mapping of photoreceptor dysfunction using high resolution three-dimensional spectral optical coherence tomography

    Explore Article SPIE Digital Library (Feb 11 2008) Ophthalmology

    B. L. Sikorski, M. Szkulmowski, J. J. Kaluzny et al. The ability to obtain reliable information on functional status of photoreceptor layer is essential for assessing vision impairment in patients with macular diseases. The reconstruction of three-dimensional retinal structure in vivo using Spectral Optical Coherence Tomography (Spectral OCT) became p ... [Proc. SPIE Int. Soc. Opt. Eng. 6844, 68440J (2008)] published Mon Feb 11, 2008. (Read Full Article)

    Comment on Article Mentions:   Bartlomiej J. Kaluzny   Maciej Wojtkowski   Andrzej A. Kowalczyk

  16. Optical Coherence Tomography for Artwork Diagnostics

    Explore Article Hindawi Publishing Corporation (Dec 15 2006) Art

    An overview of the optical coherence tomography (OCT) technique is given. Time domain, spectral and sweep source modalities are briefly described, and important physical parameters of the OCT instrument are discussed. Examples of the application of OCT to diagnosis of various art objects such as oil paintings on canvas (imaging of glaze and varnish layers), porcelain, faience, and parchment are presented. Applications to surface profilometry of painting on canvas are ... (Read Full Article)

    Comment on Article Mentions:   Maciej Wojtkowski   Nicolaus Copernicus University   Piotr Targowski

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