1. Nikola Krstajic

    0 Comments Leave a Comment

    1-14 of 14
    1. Mentioned In 14 Articles

    2. Electrophysiological and Anatomical Correlates of Spinal Cord Optical Coherence Tomography

      Electrophysiological and Anatomical Correlates of Spinal Cord Optical Coherence Tomography
      Despite the continuous improvement in medical imaging technology, visualizing the spinal cord poses severe problems due to structural or incidental causes, such as small access space and motion artifacts. In addition, positional guidance on the spinal cord is not commonly available during surgery, with the exception of neuronavigation techniques based on static pre-surgical data and of radiation-based methods, such as fluoroscopy. A fast, bedside, intraoperative real-time imaging, particularly necessary during ...
      Read Full Article
    3. Optical Group Optics in Clinical Practice III

      Optical Group Optics in Clinical Practice III
      Optical Group Optics in Clinical Practice III Time: Wednesday, 16 th December, 2015 Location: School of Physics and Astronomy, University of Nottingham Organisers: Professor Ioan Notingher, School of Physics and Astronomy, University of Nottingham, and Dr Nikola Krstajić, School of Engineering and Queens Medical Research Institute, University of Edinburgh Sponsors: Optical Group (Institute of Physics, London), Nikon, Andor and SpringerOpen We invite you to join us for an exciting day ...
      Read Full Article
    4. Optical Coherence Tomography Conference at the University of Manchester December 3rd 2014

      Optical Coherence Tomography Conference at the University of Manchester December 3rd 2014
      We invite you to join us for an exciting day discussing recent developments in optical coherence tomography (OCT). This follows on our successful meeting in 2011. The meeting will be organised around 2-3 invited talks, technical sessions with poster sessions interspersed. We hope this meeting will be of interest to a broad audience coming from industry, clinics and academia. There is no fee for this meeting, however registration is required ...
      Read Full Article
    5. Tissue surface as the reference arm in Fourier domain optical coherence tomography

      Tissue surface as the reference arm in Fourier domain optical coherence tomography
      We present a simple method applicable to common-path Fourier domain optical coherence tomography (OCT) in which the tissue surface is used as the reference arm. We propose using aluminium hydroxide powder as a potential tissue surface diffuser to allow wider application of this method. This technique allows one to avoid placing a reference arm reflective element, such as glass plate, on tissue, and intrinsically avoids both coherent and complex conjugate ...
      Read Full Article
    6. Self-assembled quantum dot based swept laser source for optical coherence tomography applications

      Self-assembled quantum dot based swept laser source for optical coherence tomography applications
      In this work the use of two identical QD SOAs to enhance the performance of swept laser system for OCT applications is discussed, resulting in an increase in bandwidth up to 94nm. The combination of GaAs based QD SOAs and InP based QW SOAs for realizing broad bandwidth sources for OCT system is described. For the swept laser source a 154nm spectral bandwidth from 1193nm to 1347nm and an average ...
      Read Full Article
    7. Evaluation of a swept-laser optical coherence tomography light source based on a novel quantum-dot based semiconductor optical amplifier

      Evaluation of a swept-laser optical coherence tomography light source based on a novel quantum-dot based semiconductor optical amplifier
      We describe a simple swept-laser design that characterizes the emission bandwidth, linewidth, spectral shape and output noise. A short cavity Littmann configuration is used in which the semiconductor optical amplifier (SOA) lasing wavelength is tuned by a galvanometer with an 830 grooves per mm diffraction grating. A 3dB coupler extracts light from the cavity formed by the grating and end-mirror and the optical output uses to illuminate a balanced swept ...
      Read Full Article
    8. Swept-Source Laser Based on Quantum-Dot Semiconductor Optical Amplifier—Applications in Optical Coherence Tomography

      Swept-Source Laser Based on Quantum-Dot Semiconductor Optical Amplifier—Applications in Optical Coherence Tomography
      We present a swept-source laser based on a quantum-dot semiconductor optical amplifier (QD SOA) (designed and manufactured by Innolume Gmbh, Germany) as the gain medium. The properties of the laser are as follows: center wavelength is 1220 nm, sweep range is 94 nm (up to 120 nm in manual mode), the peak laser power is 16 mW, and the sweep speed is 100 Hz. We apply the laser in an ...
      Read Full Article
    9. Common path Michelson interferometer based on multiple reflections within the sample arm: sensor applications and imaging artefacts

      Common path Michelson interferometer based on multiple reflections within the sample arm: sensor applications and imaging artefacts
      We present a simple common path dual beam interferometric sensor platform using a low-coherence source. In our implementation we exploit (in a controlled manner) the multiple reflections within the sample arm to provide the reference arm. This simple setup removes the need for a separate reference arm and allows an alternative architecture for using low-coherence sources in interferometric sensors. We demonstrate the sensor characteristics by using it as a vibrometer ...
      Read Full Article
    10. Quantum Dot Superluminescent Diodes for Optical Coherence Tomography: Device Engineering

      Quantum Dot Superluminescent Diodes for Optical Coherence Tomography: Device Engineering
      We present a 18 mW fiber-coupled single-mode superluminescent diode with 85 nm bandwidth for application in optical coherence tomography (OCT). First, we describe the effect of quantum dot (QD) growth temperature on optical spectrum and gain, highlighting the need for the optimization of epitaxy for broadband applications. Then, by incorporating this improved material into a multicontact device, we show how bandwidth and power can be controlled. We then go on ...
      Read Full Article
    11. Quantum Dot Superluminescent Diodes for Optical Coherence Tomography: Skin Imaging

      Quantum Dot Superluminescent Diodes for Optical Coherence Tomography: Skin Imaging
      We present a high-power (18 mW continuous wave exiting a single-mode fiber and 35 mW exiting the facet), broadband (85 nm full-width at half-maximum) quantum dot-based superluminescent diode, and apply it to a time-domain optical coherence tomography (OCT) setup. First, we test its performance with increasing optical feedback. Then we demonstrate its imaging properties on tissue-engineered (TE) skin and in vivo skin. OCT allows the tracking of epidermal development in ...
      Read Full Article
    12. Evaluation of a cheap ultrasonic stage for light source coherence function measurement, optical coherence tomography and dynamic focusing

      We evaluate the performance of a cheap ultrasonic stage in setups related to optical coherence tomography. The stage was used in several configurations: (1) optical delay line in an optical coherence tomography (OCT) setup; (2) as a delay line measuring coherence function of a low coherence source (e.g. superluminescent diode) and (3) in a dynamic focusing arrangement. The results are as follows: the stage is suitable for coherence function ...
      Read Full Article
    13. Evaluation of a cheap ultrasonic stage for light source coherence function measurement, optical coherence tomography, optical coherence microscopy, and dynamic focusing

      ...phy and Coherence Techniques IV Conference Chairs: Peter E. Andersen, Brett E. Bouma ABSTRACT REFERENCES (43) Nikola Krstajic, Stephen J. Matcher, and David Childs The Univ. of Sheffield (United Kingdom) Wiendelt Steenbe...
      Read Full Article
    14. Maximising performance of optical coherence tomography systems using a multi-section chirped quantum dot superluminescent diode

      Key device requirements for maximising resolution in an optical coherence tomography system are discussed. The design and operating parameters of a multi-contact quantum dot superluminescent diode incorporating a number of features which inhibit lasing are described. Such devices allow the independent tuning of emission power and spectral shape; hence the penetration depth and resolution in optical coherence tomography are decoupled. The emission spectrum of a device utilising chirped quantum dots ...
      Read Full Article
    15. 1-14 of 14
  1. Categories

    1. Applications:

      Art, Cardiology, Dentistry, Dermatology, Developmental Biology, Gastroenterology, Gynecology, Microscopy, NDE/NDT, Neurology, Oncology, Ophthalmology, Other Non-Medical, Otolaryngology, Pulmonology, Urology
    2. Business News:

      Acquisition, Clinical Trials, Funding, Other Business News, Partnership, Patents
    3. Technology:

      Broadband Sources, Probes, Tunable Sources
    4. Miscellaneous:

      Jobs & Studentships, Student Theses, Textbooks
  2. About Nikola Krstajic

    Nikola Krstajic

    Nikola Krstajic has spent several years developing OCT instrumentation as a post-doc at the University of Sheffield and the University of St Andrews. Since 2011 he has been at the University of Edinburgh working on time-resolved detectors, fluorescence microscopy and endoscopy instrumentation