383 Hits in 5.2 sec

Recent Techniques and Trends for Retinal Blood Vessel Extraction and Tortuosity Evaluation: A Comprehensive Review

Alice Krestanova, Jan Kubicek, Marek Penhaker
2020 IEEE Access  
Retinal blood vessel segmentation plays an important part in the early diagnosis and treatment of eye disease. It is a tool for ophthalmologists.  ...  There is no uniform metric for determining tortuosity, but this review presents a comprehensive overview of all metrics and calculations used to determine the degree of tortuosity of retinal blood vessels  ...  DSC (DICE SIMILIRATY COEFFICIENT) The DSC (DC) coefficient is a metric for determining the similarity of images.  ... 
doi:10.1109/access.2020.3033027 fatcat:utinj25kpfd3nbrmuaf5ujn7gq

Automated Method for Identification and Artery-Venous Classification of Vessel Trees in Retinal Vessel Networks

Vinayak S. Joshi, Joseph M. Reinhardt, Mona K. Garvin, Michael D. Abramoff, Arrate Muñoz-Barrutia
2014 PLoS ONE  
We propose an automated method for identification and separation of retinal vessel trees in a retinal color image by converting a vessel segmentation image into a vessel segment map and identifying the  ...  The separation of the retinal vessel network into distinct arterial and venous vessel trees is of high interest.  ...  Acknowledgments A preliminary version of this work appeared in SPIE conference proceedings [31] and [32] .  ... 
doi:10.1371/journal.pone.0088061 pmid:24533066 pmcid:PMC3922768 fatcat:inozvv44s5ca5pkzx7yv3arkvm

Stability of OCT and OCTA in the Intensive Therapy Unit Setting

Ella F. Courtie, Aditya U. Kale, Benjamin T. K. Hui, Xiaoxuan Liu, Nicholas I. Capewell, Jonathan R. B. Bishop, Tony Whitehouse, Tonny Veenith, Ann Logan, Alastair K. Denniston, Richard J. Blanch
2021 Diagnostics  
The stability of retinal blood flow measures suggests the potential for portable OCTA to provide clinically useful measures in ITU patients.  ...  To assess the stability of retinal structure and blood flow measures over time and in different clinical settings using portable optical coherence tomography angiography (OCTA) as a potential biomarker  ...  The views expressed are those of the author(s) and not necessarily those of the NIHR or the Department of Health and Social Care.  ... 
doi:10.3390/diagnostics11081516 pmid:34441449 pmcid:PMC8394026 fatcat:tobw6rpqljfjfhsquagqadfdda

MTPA_Unet: Multi-Scale Transformer-Position Attention Retinal Vessel Segmentation Network Joint Transformer and CNN

Yun Jiang, Jing Liang, Tongtong Cheng, Xin Lin, Yuan Zhang, Jinkun Dong
2022 Sensors  
Retinal vessel segmentation is extremely important for risk prediction and treatment of many major diseases.  ...  The evaluation metrics were 0.9718, 0.9762, and 0.9773 for accuracy; 0.8410, 0.8437, and 0.8938 for sensitivity; and 0.8318, 0.8164, and 0.8557 for Dice coefficient.  ...  Experimental Evaluation Metrics To quantitatively evaluate the accuracy of the method in this paper for the retinal vessel segmentation task, the performance of the evaluation metrics such as Dice coefficient  ... 
doi:10.3390/s22124592 pmid:35746372 pmcid:PMC9229851 fatcat:kwquf725rja4pg3zbojoiy76j4

Angiogenesis, vascular endothelial growth factor and its receptors in human surgical wounds

I. Kumar, C. A. Staton, S. S. Cross, M. W. R. Reed, N. J. Brown
2009 British Journal of Surgery  
In models of skeletal muscle ischemia in particular, there is a lack of quantitative, non-invasive and long term assessment of vessel morphology.  ...  These results establish the potential for speckle variance OCT as a tool for quantitative, preclinical screening of pro-and anti-angiogenic therapies.  ...  Acknowledgments The authors thank Megan Madonna and Constance Lents for assistance with experiments, and Andrew Fontanella for assistance with vascular image processing.  ... 
doi:10.1002/bjs.6778 pmid:19918856 fatcat:mhxoyckvpraclhqfj4n4kkikpe

Quantifying the vascular response to ischemia with speckle variance optical coherence tomography

Kristin M. Poole, Devin R. McCormack, Chetan A. Patil, Craig L. Duvall, Melissa C. Skala
2014 Biomedical Optics Express  
In models of skeletal muscle ischemia in particular, there is a lack of quantitative, non-invasive and long term assessment of vessel morphology.  ...  These results establish the potential for speckle variance OCT as a tool for quantitative, preclinical screening of pro-and anti-angiogenic therapies.  ...  Acknowledgments The authors thank Megan Madonna and Constance Lents for assistance with experiments, and Andrew Fontanella for assistance with vascular image processing.  ... 
doi:10.1364/boe.5.004118 pmid:25574425 pmcid:PMC4285592 fatcat:2t5ptmf7fvg2jg3bixux7n3zdm

Longitudinal analysis of quantitative biomarkers using projection-resolved OCT angiography in retinal vein occlusion

Alexandra Miere, Donato Colantuono, Camille Jung, Agnès Glacet-Bernard, Severine Becuwe, Eric Petit, Eric Souied
2021 Annals of Eye Science  
To evaluate a fully automated vascular density (VD), skeletal density (SD) and fractal dimension (FD) method for the longitudinal analysis of retinal vein occlusion (RVO) eyes using projectionresolved  ...  These parameters seem valuable biomarkers and may help improve the evaluation and management of RVO patients.  ...  VD is dependent on vessel caliber, therefore skeletal density (SD) was introduced, as a variable representative of the length of the entire retinal vascular network, independent of vessel caliber (8)  ... 
doi:10.21037/aes-20-112 fatcat:viwsj2fc3jdhtpgy3556wzlbqq

Retinal blood flow in critical illness and systemic disease: a review

E. Courtie, T. Veenith, A. Logan, A. K. Denniston, R. J. Blanch
2020 Annals of Intensive Care  
Main body Parallel mechanisms autoregulate retinal and cerebral microcirculation to maintain blood flow to meet metabolic demands across a range of perfusion pressures.  ...  Conclusion Monitoring microcirculatory flow offers the potential to enhance monitoring in the care of critically ill patients, and imaging retinal blood flow during critical illness offers a potential  ...  Of the different retinal blood flow imaging modalities, OCTA is the least invasive and is a promising method for retinal evaluation in the future.  ... 
doi:10.1186/s13613-020-00768-3 pmid:33184724 pmcid:PMC7661622 fatcat:mld7yjixnrenpkk3bt5ilki574

A quantification framework for post-lesion neo-vascularization in retinal angiography

Sylvain Takerkart, Romain Fenouil, Jerome Piovano, Alexandre Reynaud, Louis Hoffart, Frederic Chavane, Theodore Papadopoulo, John Conrath, Guillaume S. Masson
2008 2008 5th IEEE International Symposium on Biomedical Imaging: From Nano to Macro  
In particular, we implemented a level set segmentation algorithm to delineate the diffusion area.  ...  We describe an image processing framework designed to detect and quantify the genesis of microscopic choroidal blood vessels.  ...  This report is part of a larger study investigating the effects of potential drug treatments for reducing angiogenesis following the occurence of small retinal lesions [3] .  ... 
doi:10.1109/isbi.2008.4541282 dblp:conf/isbi/TakerkartFPRHCPCM08 fatcat:b3pnqa4wjbhndcxvwuirxdigj4

Characterization of changes in blood vessel width and tortuosity in retinopathy of prematurity using image analysis

C Heneghan
2002 Medical Image Analysis  
stimulate the segmenting out the retinal vasculature from an image of new blood vessels, using either cryotherapy (Cryotherapy the retina, and for using this segmentation to provide for Retinopathy of  ...  A metric is used to compare vessel crossing the two vessels are rarely normal to each paths and only stores those paths that significantly differ other and thus in the skeletal representation will appear  ...  Since some ROP insufficient for statistical significance. A similar analysis subjects were treated on their first day of examination, only was carried out for the observed changes in average vessel  ... 
doi:10.1016/s1361-8415(02)00058-0 pmid:12426111 fatcat:wjfnzcs445cjbcpaf3qg6wbrcm

Methods to Label, Image, and Analyze the Complex Structural Architectures of Microvascular Networks

Bruce A. Corliss, Corbin Mathews, Richard Doty, Gustavo Rhode, Shayn M. Peirce
2018 Microcirculation  
of interconnected blood vessel segments are highly complex.  ...  performance, and nonstandard sets of quantification metrics.  ...  High variance with image quality may skew segmentation results and output metrics, so output metrics across a range of image qualities should be examined. and muscle.  ... 
doi:10.1111/micc.12520 pmid:30548558 pmcid:PMC6561846 fatcat:sumbftkjevdmrfydjjqgeri724

Optical Coherence Tomography Angiography in Diabetic Patients: A Systematic Review

Ana Boned-Murillo, Henar Albertos-Arranz, María Dolores Diaz-Barreda, Elvira Orduna-Hospital, Ana Sánchez-Cano, Antonio Ferreras, Nicolás Cuenca, Isabel Pinilla
2021 Biomedicines  
The evaluation of retinal and choroidal plexuses using OCTA is a fundamental tool for the diagnosis and prognosis of DR.  ...  The aim of this article is to analyse the current applications of OCTA and provide an updated overview of them in the evaluation of DR.  ...  Nevertheless, FA is still the gold standard for retinal vessel evaluation, providing some additional findings such as leakage.  ... 
doi:10.3390/biomedicines10010088 pmid:35052768 pmcid:PMC8773551 fatcat:ak3gvki4sjav5htorxfzdlawfm

Macular perfusion normative data acquired with optical coherence tomography angiography in healthy four-year-old Caucasian children

Dunja Bajtl, Mirjana Bjeloš, Mladen Bušić, Ana Križanović, Leon Marković, Biljana Kuzmanović Elabjer
2021 BMC Ophthalmology  
Retinal sexual differentiation was supported with higher values of the retinal VA, VDI and TNEP, and chorioretinal VA, VDI and L in males.  ...  The purpose of this cross-sectional study involving healthy emmetropic four-year-old Caucasian children was to provide a macular perfusion normative database acquired with optical coherence tomography  ...  Fig. 1 1 OCTA en-face images (image quality Q = 43) showing binary skeletal structure in the left column A, C, E, G, a, c, e, g, and skeletonized images with overlay of the AngioTool output in the corresponding  ... 
doi:10.1186/s12886-021-02122-y pmid:34610816 fatcat:5xzmbig33rgf5pbyk7jwiij4oy

Fast skeletonization algorithm for 3D elongated objects

Ali Shahrokni, Hamid Soltanian-Zadeh, Reza A. Zoroofi, Milan Sonka, Kenneth M. Hanson
2001 Medical Imaging 2001: Image Processing  
In addition, it adaptively removes spurious branches of the skeleton, and hence, generates a smooth and refined skeleton, representing the essential structure of 3D elongated objects such as vessels, airways  ...  , and other similar organic shapes.  ...  ACKNOWLEDGMENTS This work was supported in part by the School of Intelligent Systems, Institute for Studies in Physics and Mathematics, Tehran, Iran.  ... 
doi:10.1117/12.431102 dblp:conf/miip/ShahrokniSZ01 fatcat:lqne27dn2za2redctyoa3mjknq

Liver segment approximation in CT data for surgical resection planning

Reinhard Beichel, Thomas Pock, Christian Janko, Roman B. Zotter, Bernhard Reitinger, Alexander Bornik, Kalman Palagyi, Erich Sorantin, Georg Werkgartner, Horst Bischof, Milan Sonka, J. Michael Fitzpatrick (+1 others)
2004 Medical Imaging 2004: Image Processing  
Our vessel segmentation is based on the original gray-values and on the result of a vessel enhancement filter.  ...  The work also investigates the impact of vessel segmentation on the approximation of liver segment volumes. For segment approximation, smaller portal vein branches are of importance.  ...  We are grateful for the support of this work by Prof. Dr. Friedrich Anderhuber from the Institute of Anatomy at University Hospital Graz who provided a portal vein corrosion cast.  ... 
doi:10.1117/12.535514 dblp:conf/miip/BeichelPJZRBPSW04 fatcat:dqy4wklhc5gd5pdz6xvh3cgngi
« Previous Showing results 1 — 15 out of 383 results