Canterbury Workshop and School in Optical Coherence Tomography and Adaptive Optics最新文献_第6页

Denoising based on noise parameter estimation in speckled OCT images using neural network 基于噪声参数估计的斑点OCT图像神经网络去噪

Canterbury Workshop and School in Optical Coherence Tomography and Adaptive Optics Pub Date : 2008-09-26 DOI: 10.1117/12.814937

M. Avanaki, P. Laissue, A. Podoleanu, A. Hojjat

引用次数: 13

Femtosecond lasers for optical coherence tomography 光学相干层析的飞秒激光器

Canterbury Workshop and School in Optical Coherence Tomography and Adaptive Optics Pub Date : 2008-09-26 DOI: 10.1117/12.821852

H. Crespo, C. Rosa

{"title":"Femtosecond lasers for optical coherence tomography","authors":"H. Crespo, C. Rosa","doi":"10.1117/12.821852","DOIUrl":"https://doi.org/10.1117/12.821852","url":null,"abstract":"Femtosecond Titanium:sapphire lasers can deliver high average power broadband spectra in a high quality beam, being therefore an optical source of choice for high-resolution optical coherence tomography (OCT) at high acquisition rates. We present a brief tutorial on the basic physics behind the operation and design of Kerr-lens modelocked lasers, where the high peak powers associated with femtosecond pulses give rise to nonlinear optical effects that play a major role in the laser operation itself and strongly influence the output spectrum. Additional nonlinear devices, in particular photonic crystal fibers (PCFs), can also be directly pumped with the generated femtosecond pulses to further extend the spectral range of the laser output, both in terms of bandwidth and center wavelength. Two specific laser systems employing different technologies for intracavity dispersion compensation (intracavity prisms in one case, and octave-spanning double-chirped mirrors in the other) will be described, and the corresponding advantages for OCT, namely the maximum achievable resolution and the applicability of spectral tuning and shaping techniques, will be briefly discussed.","PeriodicalId":184459,"journal":{"name":"Canterbury Workshop and School in Optical Coherence Tomography and Adaptive Optics","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132949811","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: 2

Optical coherence tomography and confocal microscopy investigations of dental prostheses 修复体的光学相干断层扫描和共聚焦显微镜研究

Canterbury Workshop and School in Optical Coherence Tomography and Adaptive Optics Pub Date : 2008-09-26 DOI: 10.1117/12.816672

M. Negruțiu, C. Sinescu, M. Hughes, A. Bradu, M. Rominu, C. Todea, G. Dobre, A. Podoleanu

{"title":"Optical coherence tomography and confocal microscopy investigations of dental prostheses","authors":"M. Negruțiu, C. Sinescu, M. Hughes, A. Bradu, M. Rominu, C. Todea, G. Dobre, A. Podoleanu","doi":"10.1117/12.816672","DOIUrl":"https://doi.org/10.1117/12.816672","url":null,"abstract":"Dental prostheses are very complex systems, heterogenous in structure, made up from various materials, with different physical properties. An essential question mark is on the physical, chemical and mechanical compatibility between these materials. They have to satisfy high stress requirements as well as esthetic challenges. The masticatory stress may induce fractures of the prostheses, which may be triggered by initial materials defects or by alterations of the technological process. The failures of dental prostheses lead to functional, esthetic and phonetic disturbances which finally render the prosthetic treatment inefficient. The purpose of this study is to evaluate the capability of en-face optical coherence tomography as a possible non-invasive high resolution method in supplying the necessary information on the material defects of dental prostheses and microleakage at prosthetic interfaces. C-scan and B-scan OCT images as well as confocal images are acquired from a large range of samples. Gaps between the dental interfaces and material defects are clearly exposed. We conclude that OCT can successfully be used as a noninvasive analysis method.","PeriodicalId":184459,"journal":{"name":"Canterbury Workshop and School in Optical Coherence Tomography and Adaptive Optics","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133234723","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

Theoretical approach on a galvanometric scanner with an enhanced duty cycle 增强占空比电流扫描仪的理论研究

Canterbury Workshop and School in Optical Coherence Tomography and Adaptive Optics Pub Date : 2008-09-26 DOI: 10.1117/12.810340

V. Duma, A. Podoleanu

{"title":"Theoretical approach on a galvanometric scanner with an enhanced duty cycle","authors":"V. Duma, A. Podoleanu","doi":"10.1117/12.810340","DOIUrl":"https://doi.org/10.1117/12.810340","url":null,"abstract":"The paper explores the possibilities of achieving a galvanometric scanner with an enhanced, as close as possible to 100%, duty cycle (η) even for high scan, i.e. high oscillation, frequencies. Nowadays solutions provide high η, but up to certain frequencies. The study of this limit frequency, of its relationship with the duty cycle, and the ascertainment of the scanning and command functions that may produce better results, is the final scope of this work. The scanning device is considered in a setup characteristic to the dimensional, usually on-line, industrial measurements. A detailed theoretical study is performed, starting with the equation of the mobile element of the galvoscanner. The expressions of the active torque and of the necessary command function that has to be used are obtained, with regard to the desired scanning function. This is considered linear and symmetrical on its active portions and with non-linear returning portions that have to be performed as fast as possible. Two such functions for the returning portions are considered and studied: parabolic and sinusoidal. The best scanning function, with regard to achieving the objectives of the device (high duty cycle for high frequencies), is obtained and the way the necessary command function has to be deduced is discussed.","PeriodicalId":184459,"journal":{"name":"Canterbury Workshop and School in Optical Coherence Tomography and Adaptive Optics","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131902293","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: 14

Using en-face optical coherence tomography to analyse gene function in Drosophila Melanogaster larval heart 采用正面光学相干断层扫描分析黑腹果蝇幼体心脏基因功能

Canterbury Workshop and School in Optical Coherence Tomography and Adaptive Optics Pub Date : 2008-09-26 DOI: 10.1117/12.814932

A. Bradu, Lisha Ma, J. Bloor, A. Podoleanu

{"title":"Using en-face optical coherence tomography to analyse gene function in Drosophila Melanogaster larval heart","authors":"A. Bradu, Lisha Ma, J. Bloor, A. Podoleanu","doi":"10.1117/12.814932","DOIUrl":"https://doi.org/10.1117/12.814932","url":null,"abstract":"In-vivo Optical Coherence Tomography (OCT) imaging of the fruit fly Drosophila Melanogaster larval heart allows non invasive visualizations and assessment of its cardiac function. In order to image Drosophila heart, we have developed a dedicated imaging instrument able to provide simultaneous OCT and Laser Scanning Confocal Microscopy (LSCM) images. With this dual imaging system, the heart can easily be located and visualised within the specimen and the change of the heart shape in a cardiac cycle monitored. Here we have used targeted gene expression to knockdown the myospheroid (mys) gene in the larval heart using a specific RNAi construct. By knocking down a β integrin subunit encoded by mys we have recorded an enlarged heart chamber in both diastolic and systolic states. Also, the fraction of reduction of the chamber diameter was smaller in the knockdown heart. These phenotypic differences indicate that impaired cardiac contractility occurs in the heart where the integrin gene express level is reduced. At our knowledge, this is for the first time when it is shown that integrins have a direct relationship to a dilated heart defect.","PeriodicalId":184459,"journal":{"name":"Canterbury Workshop and School in Optical Coherence Tomography and Adaptive Optics","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127366287","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: 1

In-vivo imaging Of adult zebrafish using optical coherence tomography 利用光学相干断层成像技术对成年斑马鱼进行体内成像

Canterbury Workshop and School in Optical Coherence Tomography and Adaptive Optics Pub Date : 2008-09-26 DOI: 10.1117/12.814914

Y. Verma, K. Divakar Rao, P. Gupta

引用次数: 4

Towards 100 nm Band NIR SLDs 迈向100nm波段近红外sld

Canterbury Workshop and School in Optical Coherence Tomography and Adaptive Optics Pub Date : 2008-09-26 DOI: 10.1117/12.811864

Yu. O. Kostin, P. I. Lapin, V. V. Prokhorov, V. R. Shidlovsky, S. Yakubovich

引用次数: 6

Does transverse chromatic aberration limit performance of AO-OCT retinal imaging? 横向色差会限制AO-OCT视网膜成像的性能吗?

Canterbury Workshop and School in Optical Coherence Tomography and Adaptive Optics Pub Date : 2008-09-26 DOI: 10.1117/12.820720

Donald T. Miller, B. Cense, Erik Koperda, R. Jonnal, Weihua Gao

{"title":"Does transverse chromatic aberration limit performance of AO-OCT retinal imaging?","authors":"Donald T. Miller, B. Cense, Erik Koperda, R. Jonnal, Weihua Gao","doi":"10.1117/12.820720","DOIUrl":"https://doi.org/10.1117/12.820720","url":null,"abstract":"The combination of adaptive optics (AO) and optical coherence tomography (OCT) has been successfully applied to in vivo retinal imaging, motivated by the potential of unprecedented 3D resolution. The eye, however, not only suffers from monochromatic aberrations, which are corrected by AO, but also substantial chromatic aberrations, which are not. To correct chromatic aberrations, achromatizing lenses have been recently employed in ultrahigh resolution AO-OCT instruments. These lenses, like their earlier predecessors for vision improvement, effectively correct the eye's longitudinal chromatic aberration (LCA), but make no attempt at the complementary transverse chromatic aberration (TCA). This raises an important concern as to the degrading impact of TCA on the 3D resolution of AO-OCT and OCT retina cameras. To address this, we undertook a theoretical analysis of TCA for high-resolution retinal imaging. The theoretical analysis included the two primary contributors of TCA for retinal imaging: (1) errors in the lateral positioning of the eye and (2) off-axis imaging. The analysis predicted the extent to which TCA impacts retinal imaging and the conditions under which it can be held at acceptable levels for AO-OCT and OCT. Several near-infrared bands were chosen that correspond to common OCT light sources.","PeriodicalId":184459,"journal":{"name":"Canterbury Workshop and School in Optical Coherence Tomography and Adaptive Optics","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121716255","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: 2

Full-range, high-speed, high-resolution 1 μm spectral-domain optical coherence tomography with BM-scan method for the human posterior eye imaging 全范围、高速、高分辨率1 μm光谱域光学相干断层扫描与bm扫描方法用于人眼后眼成像

Canterbury Workshop and School in Optical Coherence Tomography and Adaptive Optics Pub Date : 2008-09-26 DOI: 10.1117/12.814490

S. Makita, T. Fabritius, M. Miura, Y. Yasuno

引用次数: 1

Revealing fine microstructural morphology in the living human retina using Optical Coherence Tomography with pancorrection 全校正光学相干断层扫描显示活体视网膜精细显微结构形态

Canterbury Workshop and School in Optical Coherence Tomography and Adaptive Optics Pub Date : 2008-09-26 DOI: 10.1117/12.820631

C. Torti, B. Povazay, B. Hofer, A. Unterhuber, B. Hermann, W. Drexler

引用次数: 0