Canterbury Workshop and School in Optical Coherence Tomography and Adaptive Optics最新文献_第3页

Superpixel guided active contour segmentation of retinal layers in OCT volumes OCT卷中视网膜层的超像素引导活动轮廓分割

Canterbury Workshop and School in Optical Coherence Tomography and Adaptive Optics Pub Date : 2018-03-05 DOI: 10.1117/12.2282326

Fangliang Bai, S. Gibson, M. Marques, A. Podoleanu

引用次数: 2

Towards an ultra-thin medical endoscope: multimode fibre as a wide-field image transferring medium 迈向超薄医用内窥镜:多模光纤作为宽视场图像传输介质

Canterbury Workshop and School in Optical Coherence Tomography and Adaptive Optics Pub Date : 2018-03-05 DOI: 10.1117/12.2283482

M. Ďuriš, A. Bradu, A. Podoleanu, M. Hughes

{"title":"Towards an ultra-thin medical endoscope: multimode fibre as a wide-field image transferring medium","authors":"M. Ďuriš, A. Bradu, A. Podoleanu, M. Hughes","doi":"10.1117/12.2283482","DOIUrl":"https://doi.org/10.1117/12.2283482","url":null,"abstract":"Multimode optical fibres are attractive for biomedical and industrial applications such as endoscopes because of the small cross section and imaging resolution they can provide in comparison to widely-used fibre bundles. However, the image is randomly scrambled by propagation through a multimode fibre. Even though the scrambling is unpredictable, it is deterministic, and therefore the scrambling can be reversed. To unscramble the image, we treat the multimode fibre as a linear, disordered scattering medium. To calibrate, we scan a focused beam of coherent light over thousands of different beam positions at the distal end and record complex fields at the proximal end of the fibre. This way, the inputoutput response of the system is determined, which then allows computational reconstruction of reflection-mode images. However, there remains the problem of illuminating the tissue via the fibre while avoiding back reflections from the proximal face. To avoid this drawback, we provide here the first preliminary confirmation that an image can be transferred through a 2x2 fibre coupler, with the sample at its distal port interrogated in reflection. Light is injected into one port for illumination and then collected from a second port for imaging.","PeriodicalId":184459,"journal":{"name":"Canterbury Workshop and School in Optical Coherence Tomography and Adaptive Optics","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127711831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Long axial imaging range using conventional swept source lasers in optical coherence tomography via re-circulation loops 在光学相干层析成像中，通过再循环回路使用传统扫源激光器进行长轴向成像

Canterbury Workshop and School in Optical Coherence Tomography and Adaptive Optics Pub Date : 2018-03-05 DOI: 10.1117/12.2282116

A. Bradu, D. Jackson, A. Podoleanu

{"title":"Long axial imaging range using conventional swept source lasers in optical coherence tomography via re-circulation loops","authors":"A. Bradu, D. Jackson, A. Podoleanu","doi":"10.1117/12.2282116","DOIUrl":"https://doi.org/10.1117/12.2282116","url":null,"abstract":"Typically, swept source optical coherence tomography (SS-OCT) imaging instruments are capable of a longer axial range than their camera based (CB) counterpart. However, there are still various applications that would take advantage for an extended axial range. In this paper, we propose an interferometer configuration that can be used to extend the axial range of the OCT instruments equipped with conventional swept-source lasers up to a few cm. In this configuration, the two arms of the interferometer are equipped with adjustable optical path length rings. The use of semiconductor optical amplifiers in the two rings allows for compensating optical losses hence, multiple paths depth reflectivity profiles (Ascans) can be combined axially. In this way, extremely long overall axial ranges are possible. The use of the recirculation loops produces an effect equivalent to that of extending the coherence length of the swept source laser. Using this approach, the achievable axial imaging range in SS-OCT can reach values well beyond the limit imposed by the coherence length of the laser, to exceed in principle many centimeters. In the present work, we demonstrate axial ranges exceeding 4 cm using a commercial swept source laser and reaching 6 cm using an “in-house” swept source laser. When used in a conventional set-up alone, both these lasers can provide less than a few mm axial range.","PeriodicalId":184459,"journal":{"name":"Canterbury Workshop and School in Optical Coherence Tomography and Adaptive Optics","volume":"2016 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132861067","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Supercontinuum ultra-high resolution line-field OCT; experimental spectrograph comparison and comparison with current clinical OCT systems by the imaging of a human cornea 超连续统超高分辨率线场OCT;对实验摄谱仪进行比较，并与现有临床OCT系统对人角膜的成像进行比较

Canterbury Workshop and School in Optical Coherence Tomography and Adaptive Optics Pub Date : 2018-03-05 DOI: 10.1117/12.2286159

S. Lawman, V. Romano, P. Madden, S. Mason, Bryan M. Williams, Yalin Zheng, Yaochun Shen

引用次数: 3

Use of a supercontinuum white light in evaluating the spectral sensitivity of the pupil light reflex 用超连续白光评价瞳孔光反射的光谱灵敏度

Canterbury Workshop and School in Optical Coherence Tomography and Adaptive Optics Pub Date : 2018-03-05 DOI: 10.1117/12.2286064

Catherine Chin, L. Leick, A. Podoleanu, G. Lall

引用次数: 0

Phase estimation for global defocus correction in optical coherence tomography 光学相干层析成像中全局离焦校正的相位估计

Canterbury Workshop and School in Optical Coherence Tomography and Adaptive Optics Pub Date : 2018-03-05 DOI: 10.1117/12.2292547

Mikkel Jensen, N. Israelsen, A. Podoleanu, O. Bang

引用次数: 0

Stable supercontinuum source based on random lasing 基于随机激光的稳定超连续谱源

Canterbury Workshop and School in Optical Coherence Tomography and Adaptive Optics Pub Date : 2018-03-05 DOI: 10.1117/12.2282548

R. Ma, Y. Rao, Weili Zhang, Xiong Zeng, Han Wu

引用次数: 4

Optimisation of a polygon mirror-based spectral filter for swept source optical coherence tomography (SS-OCT) 扫描源光学相干层析成像(SS-OCT)中基于多边形镜的光谱滤波器的优化

Canterbury Workshop and School in Optical Coherence Tomography and Adaptive Optics Pub Date : 2018-03-05 DOI: 10.1117/12.2283034

Michael Everson, Virgil-Florin Duma, G. Dobre

{"title":"Optimisation of a polygon mirror-based spectral filter for swept source optical coherence tomography (SS-OCT)","authors":"Michael Everson, Virgil-Florin Duma, G. Dobre","doi":"10.1117/12.2283034","DOIUrl":"https://doi.org/10.1117/12.2283034","url":null,"abstract":"Medical imaging using Optical Coherence Tomography (OCT) provides clinicians with 3D, high resolution reconstructions of microscopic structures, in depth. It has been initially developed for ophthalmology, in order to scan the retinas of patients to diagnose illness. The quality of the images depends upon their axial and lateral resolutions and the properties of the light being used. Research using a polygon mirror (PM) as a spectral filter in Swept Source OCT (SS-OCT) has resulted in a variety of different experimental arrangements. Although the application of PM-based SS-OCT sources has been successfully demonstrated, the combination of their components’ fundamental properties and the overall impact they have on imaging performance is rarely reported. A more detailed examination of these properties would lead to a full description of their operation and to the best methods to employ if system performance is to be maximised. This work presents our current findings of on-going research into the optimisation of PM-based SS-OCT systems. A swept source spectral filter, consisting of a collimator, a transmission grating, a two-lens telescope and an off-axis PM with an end reflector mirror has been evaluated experimentally and compared with theoretical predictions. The system’s performance has been compared for two different fibre collimators. Although the beam width on the grating is different for each of the two collimators, the spot size at the PM facet is made the same by selecting appropriate focal lengths. An improvement in the signal roll-off at the interferometer output of ~1.0 dB/mm was obtained when using a 3.4 mm collimator compared to a 1.5 mm collimator.","PeriodicalId":184459,"journal":{"name":"Canterbury Workshop and School in Optical Coherence Tomography and Adaptive Optics","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129780649","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

New clinical opportunities for retinal vascular imaging: adaptive optics to OCT angiography 视网膜血管成像的新临床机会:自适应光学到OCT血管造影

Canterbury Workshop and School in Optical Coherence Tomography and Adaptive Optics Pub Date : 2018-03-05 DOI: 10.1117/12.2304296

R. Rosen, Toco Y P Chui, Rishard Weitz, A. Dubra, J. Carroll, P. Garcia, Alexander Pinhas, Nicole K. Scripsema, Shelley Mo, Steven Agemy, Brian D. Krawitz

引用次数: 0

Photonic compressive sensing enabled data efficient time stretch optical coherence tomography 光子压缩感知实现了数据高效的时间拉伸光学相干层析成像

Canterbury Workshop and School in Optical Coherence Tomography and Adaptive Optics Pub Date : 2018-03-05 DOI: 10.1117/12.2283035

Chaitanya K. Mididoddi, Chao Wang

引用次数: 2