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ハセガワ タイジ
HASEGAWA Taiji
長谷川 泰司 所属 医学部 医学科（東京女子医科大学病院） 職種 講師 |
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| 論文種別 | 原著 |
| 言語種別 | 英語 |
| 査読の有無 | 査読あり |
| 表題 | Choroidal neovascularization imaging using multiple en face optical coherence tomography angiography image averaging. |
| 掲載誌名 | 正式名：Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie 略 称：Graefes Arch Clin Exp Ophthalmol ISSNコード：1435702X/0721832X |
| 掲載区分 | 国外 |
| 巻・号・頁 | 257(6),pp.1119-1125 |
| 著者・共著者 | Murakawa Sakura, Maruko Ichiro, Kawano Taizo, Hasegawa Taiji, Iida Tomohiro |
| 発行年月 | 2019/06 |
| 概要 | PURPOSE:To determine the effects of averaging five en face optical coherence tomography angiographic (OCTA) images on the quality of the images in eyes with a choroidal neovascularization (CNV).METHODS:Twenty-seven eyes of 25 patients (18 men, 7 women; average age 71.0 years) with a CNV were examined by OCTA (OCT HS-100, Canon. Japan). A 3 × 3-mm image including the CNV was recorded and automatically segmented between the retinal outer layers. Analyses were performed on a single image (S-image) and the average of five single images of the same area (A-images). The region of the CNV was selected by ImageJ, and the peak signal-to-noise ratio (PSNR), the vascular density (VD), fractal dimension (FD), and the noise component using band pass filter (BPF) processing of the S- and A-images of each case were compared.RESULTS:The average PSNR for the A-images was 14.0 which was significantly higher than the 12.2 for the S-images (P < 0.01). However, the average VD was 33.6% for the S-images and 34.8% for the A-images (P > 0.1). The average FD was 1.67 for the S-images and 1.54 for the A-images (P < 0.01). The mean luminance difference obtained by subtracting the luminance of the A-image from the S-image after BPF processing was 10.41 ± 14.66 db which was positive for all eyes.CONCLUSIONS:The better quality of the A-images of a CNV and absence of a significant difference in the vascular density indicates that the improvement was due to the removal of the same signal levels of the noise component and blood vessels. |
| DOI | 10.1007/s00417-019-04275-5 |
| PMID | 30783783 |