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BEGIN:VEVENT
DTSTAMP:20110127T225116Z
UID:EE1D53EA-E5B6-11E7-833E-0050568D7F66
DTSTART;TZID=Europe/Warsaw:20100908T120000
DTEND;TZID=Europe/Warsaw:20100908T140000
DESCRIPTION:Professor Piotr Targowski and Marcin Sylwestrzak Optical cohere
 nce tomography (OCT) is a non-invasive\, non-contact technique of optical 
 sectioning of partially transparent objects with micron axial resolution. 
 This relatively new method for depth-resolved non-invasive imaging of weak
 ly scattering objects originates from medicine and has been successfully u
 sed as a diagnostic tool in ophthalmology for about a decade. Over this ti
 me a significant progress has been made in achieved resolution\, sensitivi
 ty\, data collection speed and post-processing algorithms. As using near-i
 nfrared light to unravel internal structure of examined objects\, this tec
 hnique permits localization of all discontinuities and other rapid changes
  of refractive index within the medium. The result of examination is usual
 ly presented in a convenient and easy to analyze manner of cross-sectional
  view. By serially collecting many such images\, volume information may be
  extracted. Typical OCT instrument comprises a broad-band light source or 
 very fast swept laser\, a Michelson interferometer with an investigated ob
 ject in one arm and the reference mirror in the other. In a case of most d
 eveloped Fourier domain OCT the information of the internal structure of t
 he object under investigation is encoded in the frequency of interference 
 fringes superimposed over the light source spectrum. The spectral signal i
 s registered by means of a spectrograph (Spectral OCT)\, or if a very fast
 -tuned laser is used as a source\, with a single photodiode detector (Swep
 t Source OCT). In both modalities\, the spectrum of the interference signa
 l is analyzed by means of Fourier transformation\, and the components obta
 ined have frequencies proportional to positions of scattering centers with
 in the object. A short introduction to the technique was given\, the appar
 atus used by the authors was discussed briefly\, and a paradigm for readin
 g OCT tomograms was provided. The lecture focused on signal processing in 
 Fourier domain OCT. Firstly the main sequence of procedures leading from t
 he registered spectrum to one line of the tomogram (the A-scan) was descri
 bed. Apart of Fourier transformation such procedures as linearization to o
 ptical frequency scale\, spectrum shaping and numerical dispersion compens
 ation are necessary. On this background\, the application of massively par
 allel processing of OCT data with aid of the low-cost Graphic Processing U
 nit (GPU) was presented. The reported system may be used for real-time ima
 ging of high resolution 2D tomograms or for presentation of volume data. T
 he description of data flow and parallel processing organization in GPU wa
 s given. Then some advanced techniques of visualisation of 3D OCT data wit
 h use of the OpenGL platform (Open Graphics Library)\, an Application Prog
 ramming Interface (API) for writing software dedicated to interactive 3D c
 omputer graphics\, was presented. Specifically\, the utilisation of textur
 e rendering with a modulation of transparency and colour coding as a funct
 ion of elevations within the object was shown. Finally\, more advanced tec
 hniques used in functional OCT for revealing flow velocities in blood vess
 els of human eye were presented.\n\n
LOCATION:
ORGANIZER:adam.dabrowski@put.poznan.pl
SEQUENCE:0
SUMMARY:[Legacy Report] Parallel GPGPU computations for optical coherence t
 omography (OTC)
URL;VALUE=URI:https://events.vtools.ieee.org/m/56691
X-ALT-DESC:Description: <br />Professor Piotr Targowski and Marcin Sylwestr
 zak\nOptical coherence tomography (OCT) is a non-invasive\, non-contact te
 chnique of optical sectioning of partially transparent objects with micron
  axial resolution. This relatively new method for depth-resolved non-invas
 ive imaging of weakly scattering objects originates from medicine and has 
 been successfully used as a diagnostic tool in ophthalmology for about a d
 ecade. Over this time a significant progress has been made in achieved res
 olution\, sensitivity\, data collection speed and post-processing algorith
 ms. As using near-infrared light to unravel internal structure of examined
  objects\, this technique permits localization of all discontinuities and 
 other rapid changes of refractive index within the medium. The result of e
 xamination is usually presented in a convenient and easy to analyze manner
  of cross-sectional view. By serially collecting many such images\, volume
  information may be extracted. Typical OCT instrument comprises a broad-ba
 nd light source or very fast swept laser\, a Michelson interferometer with
  an investigated object in one arm and the reference mirror in the other. 
 In a case of most developed Fourier domain OCT the information of the inte
 rnal structure of the object under investigation is encoded in the frequen
 cy of interference fringes superimposed over the light source spectrum. Th
 e spectral signal is registered by means of a spectrograph (Spectral OCT)\
 , or if a very fast-tuned laser is used as a source\, with a single photod
 iode detector (Swept Source OCT). In both modalities\, the spectrum of the
  interference signal is analyzed by means of Fourier transformation\, and 
 the components obtained have frequencies proportional to positions of scat
 tering centers within the object.\n\nA short introduction to the technique
  was given\, the apparatus used by the authors was discussed briefly\, and
  a paradigm for reading OCT tomograms was provided. The lecture focused on
  signal processing in Fourier domain OCT. Firstly the main sequence of pro
 cedures leading from the registered spectrum to one line of the tomogram (
 the A-scan) was described. Apart of Fourier transformation such procedures
  as linearization to optical frequency scale\, spectrum shaping and numeri
 cal dispersion compensation are necessary. On this background\, the applic
 ation of massively parallel processing of OCT data with aid of the low-cos
 t Graphic Processing Unit (GPU) was presented. The reported system may be 
 used for real-time imaging of high resolution 2D tomograms or for presenta
 tion of volume data. The description of data flow and parallel processing 
 organization in GPU was given. Then some advanced techniques of visualisat
 ion of 3D OCT data with use of the OpenGL platform (Open Graphics Library)
 \, an Application Programming Interface (API) for writing software dedicat
 ed to interactive 3D computer graphics\, was presented. Specifically\, the
  utilisation of texture rendering with a modulation of transparency and co
 lour coding as a function of elevations within the object was shown. Final
 ly\, more advanced techniques used in functional OCT for revealing flow ve
 locities in blood vessels of human eye were presented.
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