Influence of Image Compression on the Interpretation of Optical Coherence Tomography in Diabetic Macular Edema

Sunah Kang; Young Suk Chang; Jong Woo Kim; Chul Gu Kim; Tae Gon Lee; Jae Hui Kim

doi:10.3341/jkos.2014.55.9.1320

Journal List > J Korean Ophthalmol Soc > v.55(9) > 1009778

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Kang, Chang, Kim, Kim, Lee, and Kim: Influence of Image Compression on the Interpretation of Optical Coherence Tomography in Diabetic Macular Edema

Original Article

J Korean Ophthalmol Soc 2014;55(9):1320-1326.

Published online: 2 September 2014

DOI: https://doi.org/10.3341/jkos.2014.55.9.1320

Influence of Image Compression on the Interpretation of Optical Coherence Tomography in Diabetic Macular Edema

Sunah Kang, MD, Young Suk Chang, MD, Jong Woo Kim, MD, Chul Gu Kim, MD, Tae Gon Lee, MD, Jae Hui Kim, MD

Department of Ophthalmology, Kim's Eye Hospital, Konyang University College of Medicine, Seoul, Korea

Address reprint requests to Jae Hui Kim, MD, Department of Ophthalmology, Konyang University Kim's Eye Hospital, #136 Yeongsin-ro, Yeongdeungpo-gu, Seoul 150-034, Korea, Tel: 82-2-2671-7665, Fax: 82-2-2671-6359, E-mail: kjh7997@daum.net

Received 8 March 2014 Revised 24 April 2014 Accepted 1 August 2014

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Purpose

To evaluate the influence of image compression on optical coherence tomography (OCT) images in eyes with diabetic macular edema (DME).

Methods

Twenty eyes of 30 patients diagnosed with DME were included in this retrospective observational case series. Horizontal OCT scans centered at the center of the fovea were conducted using spectral-domain OCT (Spectral OCT/SLO^®). The images were exported to Tag Image File Format (TIFF) and then transformed to 10, 5, and 1 quality of Joint Photographic Experts Group (JPEG) format using Photoshop. OCT images were taken before and after intravitreal bevacizumab injection. The presence of intraretinal fluid, foveolar detachment, and photoreceptor inner segment/outer segment (IS/OS) disruption were evaluated in each image.

Results

The mean (+/- standard deviation) size of TIFF images and 10, 5 and 1 quality JPEG images were 1712.0, 183.3 ± 6.8, 90.9 ± 4.3, 42.8 ± 1.4 kilobytes (KB), respectively, before the injection and 1712.0, 189.5 ± 9.1, 94.9 ± 5.6, 43.4 ± 1.8 KB, respectively, after the injection. The presence of intraretinal fluid, foveolar detachment, and photoreceptor IS/OS disruption identified in TIFF images was also identified in the compressed JPEG images.

Conclusions

Quality of retinal OCT image did not influence the estimation of DME despite the JPEG image being compressed to approximately 1/40 of the original TIFF image size.

Keywords: Diabetic macular edema, Image compression, Optical coherence tomography

References

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Figure 1.

Comparison of image quality between an image of Tag Image File Format (TIFF) format (A, A-1, A-2) and images of 1 quality of Joint Photographic Experts Group (JPEG) compression format (B, B-1, B-2) in an eye with diabetic macular edema before treatment. A-1, B-1: ×600% magnified view of areas enclosed by white square (A, B), A-2, B-1: ×3,200% magnified view of areas enclosed by white square (A-1, B-1). Magnified views show the distorted image. The image was composed of small squares (dotted square, A-2) in the TIFF image, whereas the basic unit composing the JPEG image was relative large square (dotted square, B-1, B-2) which composed of 8×8 small squares. However, the presence of subfoveal serous detachment and small intraretinal cysts were clearly identified even in compressed image.

Figure 2.

Comparison of image quality between an image of Tag Image File Format (TIFF) format (A, A-1, A-2) and images of 1 quality of Joint Photographic Experts Group (JPEG) compression format (B, B-1, B-2) in an eye with diabetic macular edema after treatment. A-1, B-1: ×600% magnified view of areas enclosed by white square (A, B), A-2, B-2: ×3,200% magnified view of areas indicated by white arrows (A-1, B-1). Magnified view shows the distorted pixels in compressed JPEG image (B-1, B-2). The presence of very small intraretinal cysts white arrows was clearly identified even in compressed image (B-1).

Table 1.

Size of image, prevalence of intraretinal fluid, foveolar detachment, and foveal photoreceptor inner segment/outer segment (IS/OS) disruption, according to the file form at and degree of compression

Findings	File format and degree of image compression
Findings	TIFF (uncompressed)	JPEG (10 quality)	JPEG (5 quality)	JPEG (1 quality)
	Before treatment (n = 30)
Size of image (KB)	1712	183.3 ± 6.8	90.9 ± 4.3	42.8 ± 1.4
Intraretinal fluid (+/-) (n)	30/0	30/0	30/0	30/0
Foveolar detachment (+/-) (n)	10/20	10/20	10/20	10/20
IS/OS disruption (+/-) (n)	3/27	3/27	3/27	3/27
	After intravitreal bevacizumab injections (n = 30)
Size of image (KB)	1712	189.5 ± 9.1	94.9 ± 5.6	43.4 ± 1.8
Intraretinal fluid (+/-) (n)	23/7	23/7	23/7	23/7
Foveolar detachment (+/-) (n)	5/25	5/25	5/25	5/25
IS/OS disruption (+/-) (n)	3/27	3/27	3/27	3/27

Values are presented as mean ± SD unless otherwise indicated.

TIFF = tag image file format; JPEG = joint photographic experts group; KB = kilobytes.

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