Snapshot 3D optical coherence tomography system using image mapping spectrometry

Abstract

Abstract:A snapshot 3-Dimensional Optical Coherence Tomography system was developed using Image Mapping Spectrometry. This system can give depth information (Z) at different spatial positions (XY) within one camera integration time to potentially reduce motion artifact and enhance throughput. The current (x,y,λ ) datacube of (85×356×117) provides a 3D visualization of sample with 400 μm depth and 13.4 μm in transverse resolution. Axial resolution of 16.0 μm can also be achieved in this proof-of-concept system. We present an analysis of the theoretical constraints which will guide development of future systems with increased imaging depth and improved axial and lateral resolutions.

A review of snapshot multidimensional optical imaging: Measuring photon tags in parallel

“…Representative techniques in this category are 3D integral imaging [147], single-shot digital holography [148], and snapshot 3D optical coherence tomography [149]. …”

“…A representative technique is snapshot 3D optical coherence tomography (OCT) [149]. In spectral-domain OCT, the photons scattered from different depth layers exhibit different modulation frequencies in the spectrum [190].…”

“…However, conventional spectral-domain OCT systems normally utilize point-scanning or pushbroom imaging to measure spectra, resulting in a considerable loss of optical throughput. To enable snapshot 3D OCT, Nguyen et al utilized a hyperspectral imager, IMS, to capture all the spectra in parallel [149]. Because the depth range is determined by the number of channels sampling the spectrum, the authors employed a large-format CCD sensor to accommodate the required datacube size, and the sensor’s relatively slow data readout limits the volumetric frame rate.…”

High resolution corneal and single pulse imaging with line field spectral domain optical coherence tomography

“…It is not applicable to a continuous stream of data where a high frame rate camera is necessary. The technique should be expandable to capture a 3D volume in a single pulse with the application of 2D to 1D mapping such as that used in [11]. Further orders of magnitude decrease of the temporal gate, thus increase of the equivalent A-Scan rate, should be possible with the use of femtosecond laser sources.…”

“…Line Field SD-OCT (LF-OCT) [10] captures a whole cross-sectional image (B-Scan) or even a three dimensional volume [10,11] in a single shot, instead of just a single A-Scan. It does this by using an imaging spectrograph.…”