Theoretical Validation of the Optimal Wavelength Sets used for the Capillary/Vessel Density Spatial Pattern Detection

2012 ◽  
Author(s):  
Rajesh Kanawade ◽  
Florian Stelzle ◽  
Michael Schmidt
Keyword(s):  
Spatial Pattern ◽  
Vessel Density ◽  
Pattern Detection ◽  
Capillary Vessel ◽  
Optimal Wavelength

scholarly journals Comparison of Retinal Layer Thickness and Capillary Vessel Density in the Patients with Spontaneously Resolved Acute Central Serous Chorioretinopathy

2020 ◽  
Vol 10 (1) ◽  
pp. 45
Author(s):  
Kyu Jin Han ◽  
Hyeong Ju Kim ◽  
Je Moon Woo ◽  
Jung Kee Min
Keyword(s):  
Visual Acuity ◽  
Layer Thickness ◽  
Central Serous Chorioretinopathy ◽  
Subretinal Fluid ◽  
Vessel Density ◽  
Foveal Avascular Zone ◽  
Retinal Layer ◽  
Healthy Controls ◽  
Retrospective Case ◽  
Capillary Vessel

We investigate retinal layer thickness and capillary vessel density (VD) in the patients with central serous chorioretinopathy (CSC) who recovered spontaneously and evaluate the correlation between the changes in these values and visual outcomes using swept-source optical coherence tomography (SS-OCT) and OCT angiography (OCTA). This retrospective case–control study included 34 eyes of 34 patients with spontaneously resolved acute CSC. The changes in retinal layer thickness and capillary VD were examined using SS-OCT and OCTA after complete resolution of subretinal fluid (SRF). The fellow eyes and 34 healthy eyes were used as controls. In the eyes with CSC, the outer retinal layer was significantly thinner than in the eyes of fellow and healthy controls. The foveal avascular zone area and VDs in the superficial and deep capillary plexus in the eyes with CSC were not significantly different from those in the eyes of fellow and healthy controls. The VD of the choriocapillaris in the eyes with CSC was significantly lower than that in the eyes of fellow and healthy controls. Correlation analyses revealed that the outer retinal layer thickness and initial visual acuity were positively correlated with the final visual acuity. Furthermore, the initial SRF area and height were negatively correlated with the outer retinal layer thickness after SRF resolution. Attenuation of outer retinal layer thickness and decreased VD of the choriocapillaris were observed in the eyes with spontaneously resolved acute CSC. The outer retinal layer thickness could be an important visual predictor of CSC.

scholarly journals MEMGENE: Spatial pattern detection in genetic distance data

2014 ◽  
Vol 5 (10) ◽  
pp. 1116-1120 ◽  
Author(s):  
Paul Galpern ◽  
Pedro R. Peres-Neto ◽  
Jean Polfus ◽  
Micheline Manseau
Keyword(s):  
Genetic Distance ◽  
Spatial Pattern ◽  
Pattern Detection ◽  
Distance Data

Detection of spatial pattern at several scales simultaneously

1975 ◽  
Vol 7 (03) ◽  
pp. 449-450
Author(s):  
Roger Mead
Keyword(s):  
Spatial Pattern ◽  
Plant Communities ◽  
Random Distribution ◽  
Small Sample ◽  
Pattern Detection ◽  
Ecological Research ◽  
Valid Method ◽  
Distributional Properties ◽  
The Individual ◽  
Plant Ecological

Detection of the different scales of pattern in plant communities is an important area of plant ecological research, and various tests of pattern have been devised. The method of pattern detection which is ecologically most meaningful is that due to Greig-Smith (1952) but, until now, this has suffered from the lack of valid tests of significance for the individual scales of pattern, once the overall departure from a random distribution has been established. Various tests which partially or completely overcome this deficiency are discussed and exemplified and their small sample distributional properties examined. It is concluded that a set of tests, based on randomisation arguments, provides a fully valid method of testing simultaneously for pattern at various scales.

scholarly journals Novel method for early signs of clinical shock detection by monitoring blood capillary/vessel spatial pattern

2013 ◽  
Vol 7 (10) ◽  
pp. 841-849 ◽  
Author(s):  
Rajesh Kanawade ◽  
Florian Klämpfl ◽  
Max Riemann ◽  
Christian Knipfer ◽  
Katja Tangermann-Gerk ◽  
...  
Keyword(s):  
Spatial Pattern ◽  
Blood Capillary ◽  
Capillary Vessel ◽  
Early Signs ◽  
Novel Method ◽  
Shock Detection

OCT-A evaluation of radiation vasculopathy following slotted plaque brachytherapy

2021 ◽  
pp. 112067212110443
Author(s):  
Anthony Fam ◽  
Ankit S Tomar ◽  
Paul T Finger
Keyword(s):  
Visual Acuity ◽  
Radiation Dose ◽  
Choroidal Melanoma ◽  
Vessel Density ◽  
Imaging Data ◽  
Fiber Layer ◽  
Cross Sectional ◽  
Capillary Vessel ◽  
Plaque Brachytherapy ◽  
Radial Peripapillary Capillary

Purpose: To determine a reliable diagnostic method to reveal and monitor subclinical progression of neural and perineural radiation vasculopathy. Methods: A retrospective cross-sectional study, where optical coherence tomography angiography (OCT-A) imaging data was collected and analyzed from 22 consecutive patients that had been treated with circumneural slotted plaque brachytherapy for peripapillary, juxtapapillary, or circumpapillary choroidal melanomas. Pre-operative dosimetry of palladium-103 radiation dose to the optic nerve and fovea were collected. Quantified differences in OCT-A-measured vessel density and length in treated verses untreated contralateral control eyes were collected. Vessel density and length were correlated to radiation dose, plaque slot depth, visual acuity outcomes, and circumpapillary retinal nerve fiber layer thickness. Results: Patients had post-irradiation follow-up of median 39 months, interquartile range 62 months). The mean optic disc radiation dose was 89.9 Gy ± 39.2 (86.5, 30.8–189.0). In comparison to controls, OCT-A imaging revealed significant differences in radial peripapillary capillary vessel density (18 μm2 in case eyes, 34 μm2 in control eyes; p < 0.001) and length (10 μm in case eyes, 14 μm in control eyes; p < 0.001). Change in vessel density did not show a significant correlation to radiation dose, slot depth, or visual acuity. However, change in vessel length was significantly correlated to radiation dose ( p = 0.049) and change in visual acuity ( p < 0.001). Conclusions: OCT-A imaging revealed that radial peripapillary capillary vessel density and length were significantly reduced after circumneural irradiation for choroidal melanoma. Therefore, OCT-A imaging can be used to monitor progression of papillary vasculopathy associated with radiation optic neuropathy.

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