scholarly journals Robust three-dimensional registration on optical coherence tomography angiography for speckle reduction and visualization

2020 ◽  
Vol 11 (3) ◽  
pp. 879-894
Author(s):  
Yuxuan Cheng ◽  
Zhongdi Chu ◽  
Ruikang K. Wang
Keyword(s):  
Optical Coherence Tomography ◽  
Optical Coherence Tomography Angiography ◽  
Three Dimensional ◽  
Speckle Reduction ◽  
Optical Coherence

scholarly journals Optical Coherence Tomography Angiography of Choroidal Neovascularisation

2016 ◽  
Vol 10 (01) ◽  
pp. 29 ◽  
Author(s):  
Lorenzo Iuliano ◽  
Keyword(s):  
Optical Coherence Tomography ◽  
Optical Coherence Tomography Angiography ◽  
Three Dimensional ◽  
Choroidal Neovascularisation ◽  
Diagnostic Tools ◽  
Retinal Diseases ◽  
Optical Coherence ◽  
Promising Technique ◽  
Non Invasive ◽  
Dimensional Reconstruction

Optical coherence tomography angiography (OCTA) is a new promising technique able to provide a rapid, dyeless and non-invasive three-dimensional reconstruction of perfused vessels of retina and choroid. OCTA has been recently added to the diagnostic tools of retinal experts, and its role is still being explored in different retinal diseases. Chorodial neovascularisations (CNVs) are among the most significant disorders where OCTA is enhancing our diagnostic and classification skills, since it demonstrates an excellent capacity to identify and characterise each specific subtype of CNV.

scholarly journals Detection of Choroidal Neovascularization by Optical Coherence Tomography Angiography with Assistance from Use of the Image Segmentation Method

2019 ◽  
Vol 10 (1) ◽  
pp. 137
Author(s):  
Yuan-Shao Cheng ◽  
Shih-Huan Lin ◽  
Chih-Yu Hsiao ◽  
Chia-Jen Chang
Keyword(s):  
Optical Coherence Tomography ◽  
Image Segmentation ◽  
Choroidal Neovascularization ◽  
Optical Coherence Tomography Angiography ◽  
Color Space ◽  
Three Dimensional ◽  
Experimental Result ◽  
Optical Coherence ◽  
Three Dimensional Model ◽  
Time Required

Optical coherence tomography angiography (OCTA) is a popular medical imaging technology that can quickly establish a three-dimensional model of the fundus without dye injection. However the number of images in a model is quite large, so finding the lesions through image processing technology can greatly reduce the time required for the judgment of the condition. This paper proposes a method for finding choroidal neovascularization (CNV) in OCTA images. Among the several characteristics of CNV, the larger turning angle of blood vessels is a relatively clear feature, so we will use this property to find out whether there is CNV in an OCTA image. We will transform the color space to CIELAB space, and extract the L-channel prior to preceding to the next step. We will then use some image segmentation methods to find the clearer vessel region. Finally, we will detect the CNV through certain morphology methods. The experimental result shows that our proposed method can effectively find the CNV in the OCTA image, meaning that we can make automated judgments through this method in the future and reduce the time necessary for human judgment.

scholarly journals Optical Coherence Tomography Angiography

2019 ◽  
Vol 2 (1) ◽  
pp. 46-54
Author(s):  
Dita Mintardi ◽  
AK Ansyori ◽  
Ramzi Amin
Keyword(s):  
Optical Coherence Tomography ◽  
High Speed ◽  
Optical Coherence Tomography Angiography ◽  
Three Dimensional ◽  
Imaging Method ◽  
Optical Coherence ◽  
Cross Sectional ◽  
En Face ◽  
Capillary Plexus ◽  
Oct Imaging

Optical Coherence Tomography Angiography (OCTA) is a new high-resolution imaging method for visualizing retinal and choroidal circulation without any dye injection By detecting intravascular flow quickly when needed and being able to repeat images, as often as needed, without risk to patients, doctors will value OCTA as one of the most important applications of OCT imaging because of its ability to offer precise visualization of intravascular flow in the inner retina layer and outside, as well as the inner choroid. OCTA uses high-speed structural OCT imaging and provides three-dimensional data about microvascular structures, enabling visualization of the en face apart from the retinal capillary plexus and choriocapillaris, combined with co-registered en face and cross-sectional structural OCT. Although OCTA is a strong modality, it can have imaging artifacts and provide information that is inherently more complex than structural OCT alone. Successful interpretation of OCTA findings requires an understanding of how OCTA works, the relationship of various ocular pathologies to its angiographic features, and integrated assessment of angiographic and structural OCT data.

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