Publication detail

Gabor fusion technique in a Talbot bands optical coherence tomography system

BOUCHAL, P. BRADU, A. PODOLEANU, A.

Czech title

Gaborova fúze obrazu ve Fourierovské optické koherentní tomografii využívající Talbotových pásů

English title

Gabor fusion technique in a Talbot bands optical coherence tomography system

Type

journal article in Web of Science

Language

en

Original abstract

In this paper we show how to advantageously combine two effects to enhance the sensitivity with depth in Fourier domain (FD) optical coherence tomography (OCT): Talbot bands (TB) and Gabor-based fusion (GF) technique. TB operation is achieved by routing the two beams, from the object arm and from the reference arm in the OCT interferometer, along parallel separate paths towards the spectrometer. By adjusting the lateral gap between the two beams in their way towards the spectrometer, the position for the maximum of contrast variation of spectral modulation versus the optical path difference in the interferometer is adjusted. For five values of the focus position, the gap between the two beams is readjusted to reach maximum sensitivity. Then, similar to the procedure employed in the GF technique, a compound image is formed by stitching together the parts of the five images that exhibited maximum brightness. The smaller the diameters of the two beams, the narrower the visibility profile versus depth in Talbot bands, which brings advantages in terms of mirror terms attenuation. However, this leads to a larger spot on the linear camera, which introduces losses, therefore the combined procedure, TB/GF is investigated for four different values of the beam diameters of the two beams. Future cameras with larger pixel size may take full advantage of the TB/GF procedure proposed here.

Czech abstract

V článku je představena metodika efektivního využití dvou známých technik pro zvýšení hloubkové citlivosti ve Fourierovské optické koherentní tomografii. Modifikovaný interferometr umožňuje příčně separovat dva interferometrické svazky při cestě do spektrometru a optimalizovat tak kontrast detekovaného signálu ve vybraných hloubkách zobrazovaného objektu. Pro dosažení maximálního kontrastu je tato optimalizace doprovázena postupným přeostřováním v předmětové větvi interferometru.

English abstract

In this paper we show how to advantageously combine two effects to enhance the sensitivity with depth in Fourier domain (FD) optical coherence tomography (OCT): Talbot bands (TB) and Gabor-based fusion (GF) technique. TB operation is achieved by routing the two beams, from the object arm and from the reference arm in the OCT interferometer, along parallel separate paths towards the spectrometer. By adjusting the lateral gap between the two beams in their way towards the spectrometer, the position for the maximum of contrast variation of spectral modulation versus the optical path difference in the interferometer is adjusted. For five values of the focus position, the gap between the two beams is readjusted to reach maximum sensitivity. Then, similar to the procedure employed in the GF technique, a compound image is formed by stitching together the parts of the five images that exhibited maximum brightness. The smaller the diameters of the two beams, the narrower the visibility profile versus depth in Talbot bands, which brings advantages in terms of mirror terms attenuation. However, this leads to a larger spot on the linear camera, which introduces losses, therefore the combined procedure, TB/GF is investigated for four different values of the beam diameters of the two beams. Future cameras with larger pixel size may take full advantage of the TB/GF procedure proposed here.

Keywords in Czech

optická koherentní tomografie; adaptivní zobrazování

Keywords in English

Optical coherence tomography; Medical optics instrumentation; Adaptive imaging

RIV year

2012

Released

21.02.2012

Publisher

OPTICAL SOC AMER

Location

MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA

ISSN

1094-4087

Volume

20

Number

5

Pages from–to

5368–5383

Pages count

16

BIBTEX


@article{BUT99006,
  author="Petr {Bouchal} and Adrian {Bradu} and Adrian {Podoleanu},
  title="Gabor fusion technique in a Talbot bands optical coherence tomography system",
  year="2012",
  volume="20",
  number="5",
  month="February",
  pages="5368--5383",
  publisher="OPTICAL SOC AMER",
  address="MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA",
  issn="1094-4087"
}