09:15 〜 09:30
▲ [15a-C31-1] Full-field optical coherence tomography through digital holography
キーワード：Optical coherence tomography, 3D imaging
Optical coherence tomography (OCT) enables the measurement of the structural information of diffuse samples such as tissue in a non-invasive and label-free way, by retrieving a depth-resolved signal from the back-scattered part of the excitation light. In its original implementation, classically denoted as time-domain OCT, a three-dimensional scanning is required to retrieve an x-y image of the signal emitted by the back-scatterers at a certain depth z, with the signal being extracted from the interference pattern in depth.
Several approaches were developed to reduce the scanning requirements and improve the acquisition speed. On one hand, Fourier-domain OCT enables the recording of the whole depth information through the recording of a spectrally-resolved interferogram. In parallel, full-field temporal OCT has been proposed, where the detector is replaced by a 2D camera, enabling the acquisition of the tomogram directly through a scan in depth by recording the interference patterns in parallel. We present early results of a full-field OCT implementation where the signal retrieval is based on off-axis holography. The scanning speed can be significantly improved due to the ability of recovering both amplitude and phase from the spatially-modulated interferogram.
Several approaches were developed to reduce the scanning requirements and improve the acquisition speed. On one hand, Fourier-domain OCT enables the recording of the whole depth information through the recording of a spectrally-resolved interferogram. In parallel, full-field temporal OCT has been proposed, where the detector is replaced by a 2D camera, enabling the acquisition of the tomogram directly through a scan in depth by recording the interference patterns in parallel. We present early results of a full-field OCT implementation where the signal retrieval is based on off-axis holography. The scanning speed can be significantly improved due to the ability of recovering both amplitude and phase from the spatially-modulated interferogram.