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Multiple enface image averaging for enhanced optical coherence tomography angiography imaging
- Source :
- Acta Ophthalmologica. 96:e820-e827
- Publication Year :
- 2018
- Publisher :
- Wiley, 2018.
-
Abstract
- Purpose To investigate the effect of multiple enface image averaging on image quality of the optical coherence tomography angiography (OCTA). Methods Twenty-one normal volunteers were enrolled in this study. For each subject, one eye was imaged with 3 × 3 mm scan protocol, and another eye was imaged with the 6 × 6 mm scan protocol centred on the fovea using the ZEISS Angioplex™ spectral-domain OCTA device. Eyes were repeatedly imaged to obtain nine OCTA cube scan sets, and nine superficial capillary plexus (SCP) and deep capillary plexus (DCP) were individually averaged after registration. Results Eighteen eyes with a 3 × 3 mm scan field and 14 eyes with a 6 × 6 mm scan field were studied. Averaged images showed more continuous vessels and less background noise in both the SCP and the DCP as the number of frames used for averaging increased, with both 3 × 3 and 6 × 6 mm scan protocols. The intensity histogram of the vessels dramatically changed after averaging. Contrast-to-noise ratio (CNR) and subjectively assessed image quality scores also increased as the number of frames used for averaging increased in all image types. However, the additional benefit in quality diminished when averaging more than five frames. Averaging only three frames achieved significant improvement in CNR and the score assigned by certified grades. Conclusion Use of multiple image averaging in OCTA enface images was found to be both objectively and subjectively effective for enhancing image quality. These findings may of value for developing optimal OCTA imaging protocols for future studies.
- Subjects :
- Adult
Male
Multiple image
Future studies
Capillary plexus
Image quality
Visual Acuity
Image processing
01 natural sciences
Retina
010309 optics
Young Adult
03 medical and health sciences
0302 clinical medicine
0103 physical sciences
Image Processing, Computer-Assisted
Humans
Prospective Studies
Fluorescein Angiography
Mathematics
business.industry
Retinal Vessels
General Medicine
Optical coherence tomography angiography
Middle Aged
Image Enhancement
Healthy Volunteers
Ophthalmology
Normal volunteers
Cross-Sectional Studies
030221 ophthalmology & optometry
Female
Nuclear medicine
business
Tomography, Optical Coherence
Image averaging
Subjects
Details
- ISSN :
- 1755375X
- Volume :
- 96
- Database :
- OpenAIRE
- Journal :
- Acta Ophthalmologica
- Accession number :
- edsair.doi.dedup.....696409d64edb7e4718367d2cf1282630