Details

Autor(en) / Beteiligte

• Biedermann, Benjamin R
• Wieser, Wolfgang
• Eigenwillig, Christoph M
• Palte, Gesa
• Adler, Desmond C
• Srinivasan, Vivek J
• Fujimoto, James G
• Huber, Robert

Titel

Real time en face Fourier-domain optical coherence tomography with direct hardware frequency demodulation

Ist Teil von

• Optics letters, 2008-11, Vol.33 (21), p.2556

Ort / Verlag

United States

Erscheinungsjahr

2008

Quelle

MEDLINE

Beschreibungen/Notizen

• We demonstrate en face swept source optical coherence tomography (ss-OCT) without requiring a Fourier transformation step. The electronic optical coherence tomography (OCT) interference signal from a k-space linear Fourier domain mode-locked laser is mixed with an adjustable local oscillator, yielding the analytic reflectance signal from one image depth for each frequency sweep of the laser. Furthermore, a method for arbitrarily shaping the spectral intensity profile of the laser is presented, without requiring the step of numerical apodization. In combination, these two techniques enable sampling of the in-phase and quadrature signal with a slow analog-to-digital converter and allow for real-time display of en face projections even for highest axial scan rates. Image data generated with this technique is compared to en face images extracted from a three-dimensional OCT data set. This technique can allow for real-time visualization of arbitrarily oriented en face planes for the purpose of alignment, registration, or operator-guided survey scans while simultaneously maintaining the full capability of high-speed volumetric ss-OCT functionality.