Depth-dependent dispersion compensation for full-depth OCT image

Pan, L.; Wang, Xiangzhao; Li, Zhongliang; Zhang, Xiangyang; Yang, Bojun; Nan, Nan; Chen, Yan; Wang, Xuan

doi:10.1364/oe.25.010345

Cited by 31 publications

(24 citation statements)

References 20 publications

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“…68,71 This is achieved by multiplying the spectral data (which is formerly linearized in k-space, zero-padded to 2 12 pixels and spectrally shaped) with a compensating phase term e −iφðkÞ . 69,72 The empirically determined phase correction amounts to E Q -T A R G E T ; t e m p : i n t r a l i n k -; e 0 0 1 ; 3 2 6 ; 7 5 2…”

Section: Eoct Scanner Performancementioning

confidence: 99%

In vivo imaging in the oral cavity by endoscopic optical coherence tomography

et al. 2018

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The common way to diagnose hard and soft tissue irregularities in the oral cavity is initially the visual inspection by an experienced dentist followed by further medical examinations, such as radiological imaging and/or histopathological investigation. For the diagnosis of oral hard and soft tissues, the detection of early transformations is mostly hampered by poor visual access, low specificity of the diagnosis techniques, and/or limited feasibility of frequent screenings. Therefore, optical noninvasive diagnosis of oral tissue is promising to improve the accuracy of oral screening. Considering this demand, a rigid handheld endoscopic scanner was developed for optical coherence tomography (OCT). The novelty is the usage of a commercially near-infrared endoscope with fitting optics in combination with an established spectral-domain OCT system of our workgroup. By reaching a high spatial resolution, in vivo images of anterior and especially posterior dental and mucosal tissues were obtained from the oral cavity of two volunteers. The convincing image quality of the endoscopic OCT device is particularly obvious for the imaging of different regions of the human soft palate with highly scattering fibrous layer and capillary network within the lamina propria.

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Section: Eoct Scanner Performancementioning

confidence: 99%

In vivo imaging in the oral cavity by endoscopic optical coherence tomography

et al. 2018

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“…Unfortunately, the broader the spectral range is, the more prominent chromatic dispersion effects become. Whereas it is fairly easy to compensate the dispersion mismatch in the arms of an interferometer 2 – 8 , the resolution degradation for deeper layers of an object caused by a dispersive character of these layers is challenging to mitigate as it requires the information about the dispersion coefficients of each layer 9 . It was shown that the practical limit for axial resolution—one which weighs in the bandwidth-dispersion trade-off during imaging of bulk objects such as the eye—is 1 μm 10 and this limit has already been achieved in OCT in both visible 11 – 13 and NIR 14 , 15 wavelength ranges.…”

Section: Introductionmentioning

confidence: 99%

Intensity correlation OCT is a classical mimic of quantum OCT providing up to twofold resolution improvement

Kolenderska

Kolenderski

2021

Sci Rep

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Quantum Optical Coherence Tomography (Q-OCT) uses quantum properties of light to provide several advantages over its classical counterpart, OCT: it achieves a twice better axial resolution with the same spectral bandwidth and it is immune to even orders of dispersion. Since these features are very sought-after in OCT imaging, many hardware and software techniques have been created to mimic the quantum behaviour of light and achieve these features using traditional OCT systems. The most recent, purely algorithmic scheme—an improved version of Intensity Correlation Spectral Domain OCT named ICA-SD-OCT—showed even-order dispersion cancellation and reduction of artefacts. The true capabilities of this method were unfortunately severely undermined, both in terms of its relation to Q-OCT and its main performance parameters. In this work, we provide experimental demonstrations as well as numerical and analytical arguments to show that ICA-SD-OCT is a true classical equivalent of Q-OCT, more specifically its Fourier domain version, and therefore it enables a true two-fold axial resolution improvement. We believe that clarification of all the misconceptions about this very promising algorithm will highlight the great value of this method for OCT and consequently lead to its practical applications for resolution- and quality-enhanced OCT imaging.

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“…However, only half of the available depth range can be used for imaging in standard SD-OCT systems, otherwise complex conjugate mirror items overlap with sample structures. To overcome this problem, several full-range techniques have been proposed, which follow two categories: phase modulation methods [3][4][5] and dispersion-coded methods [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Full-depth spectral domain optical coherence tomography technology insensitive to phase disturbance

Sun

Ming

et al. 2018

Biomed. Opt. Express

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To achieve full-depth spectral domain optical coherence tomography in the case of strong environmental disturbance, the iterative phase-shifting (IPS) method and modified dispersion-coded (MDC) method are proposed in this work. In IPS, the precise amount of phase shift is retrieved by iteration, and the direction of the phase shift is determined by dispersion compensation. Conjugate mirror items and noise can be simultaneously eliminated by two captured interferograms, whereas only one of them can be removed in the traditional phase-shift method with two interferograms. In MDC, they are removed through dispersion compensation and signal extraction with a single interferogram. Full-depth images of a glass slide, an onion, and a live fish eye are obtained by the two methods. The advantages and disadvantages of each method are analyzed and compared. IPS is found to be more effective for removing conjugate artifacts, whereas MDC is more conducive to real-time imaging. For a 2 mm × 3.6 mm image of a fish eye (200 depth scans and 1200 spectral sampling points per depth scan), the mirror image artifact is reduced by 28.55 dB in MDC and 41.53 dB in IPS. Processing times are 5.1 seconds (20 iterations) for the IPS method and 0.91 seconds for MDC.

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Depth-dependent dispersion compensation for full-depth OCT image

Cited by 31 publications

References 20 publications

In vivo imaging in the oral cavity by endoscopic optical coherence tomography

In vivo imaging in the oral cavity by endoscopic optical coherence tomography

Intensity correlation OCT is a classical mimic of quantum OCT providing up to twofold resolution improvement

Full-depth spectral domain optical coherence tomography technology insensitive to phase disturbance

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