Healthy Clinical Trial
Official title:
Semi-manual Vessel Density Analysis on Optical Coherence Tomography Angiography Images of Healthy Adults
Verified date | June 2022 |
Source | Semmelweis University |
Contact | n/a |
Is FDA regulated | No |
Health authority | |
Study type | Observational |
Purpose of the study is to examine the vessel density of healthy adults' optical coherence tomography angiography images with two semi-manual methods and an automated quantification program.
Status | Completed |
Enrollment | 39 |
Est. completion date | March 30, 2022 |
Est. primary completion date | November 20, 2018 |
Accepts healthy volunteers | Accepts Healthy Volunteers |
Gender | All |
Age group | 18 Years to 99 Years |
Eligibility | Inclusion Criteria: - healthy patients without eye disease Exclusion Criteria: - incapacity - any history or clinical evidence of retinal disease or glaucoma - previous ocular surgery or laser photocoagulation - optical media opacities that would disturb imaging |
Country | Name | City | State |
---|---|---|---|
Hungary | Semmelweis University, Department of Ophthalmology | Budapest |
Lead Sponsor | Collaborator |
---|---|
Semmelweis University |
Hungary,
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* Note: There are 20 references in all — Click here to view all references
Type | Measure | Description | Time frame | Safety issue |
---|---|---|---|---|
Primary | Vessel density (VD) measured by Mexican Hat filtering technique | Following standard OCTA imaging with Zeiss Cirrus Angioplex, images are transferred to ImageJ and proportion of the vessels and the total image area (white pixels2/total number of pixels2) is calculated using Mexican Hat filtering technique. | Through study completion, 1 year | |
Primary | Skeleton density (SD) measured by Mexican Hat filtering technique | Following standard OCTA imaging with Zeiss Cirrus Angioplex, images are transferred to ImageJ and length of blood vessels (white skeletonized pixels/total number of pixels2) is calculated using Mexican Hat filtering technique. | Through study completion, 1 year | |
Primary | Vessel diameter index (VDI) measured by Mexican Hat filtering technique | Represents the average vessel caliber (two dimensional white pixels in the binarized image/one dimensional white pixels in the skeletonized image or VD/SD) using Mexican Hat filtering technique. | Through study completion, 1 year | |
Primary | Vessel density (VD) measured by Shanbag tresholding technique | Following standard OCTA imaging with Zeiss Cirrus Angioplex, images are transferred to ImageJ and proportion of the vessels and the total image area (white pixels2/total number of pixels2) is calculated using Shanbag tresholding technique. | Through study completion, 1 year | |
Primary | Skeleton density (SD) measured by Shanbag tresholding technique | Following standard OCTA imaging with Zeiss Cirrus Angioplex, images are transferred to ImageJ and length of blood vessels (white skeletonized pixels/total number of pixels2) is calculated using Shanbag tresholding technique. | Through study completion, 1 year | |
Primary | Vessel diameter index (VDI) measured by Shanbag tresholding technique | Represents the average vessel caliber (two dimensional white pixels in the binarized image/one dimensional white pixels in the skeletonized image or VD/SD) using Shanbag tresholding technique. | Through study completion, 1 year | |
Primary | Vessel density (VD) measured by Angioplex Metrix | Following standard OCTA imaging with Zeiss Cirrus Angioplex measurement is done by built-in non-disclosed VD algorithm owned by Zeiss. | Through study completion, 1 year | |
Primary | Skeleton density (SD) measured by Angioplex Metrix | Following standard OCTA imaging with Zeiss Cirrus Angioplex measurement done by built-in non-disclosed SD algorithm owned by Zeiss. | Through study completion, 1 year | |
Secondary | Comparison of results obtained by the three quantification techniques | Comparison of VD and SD (see above) obtained by Mexican Hat filtering technique, Shanbag tresholding technique and built-in Zeiss proprietary algorithm. | Through study completion, 1 year |
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