Laser Marks Dataset

Introduction

Photocoagulation is the most common and accepted treatment of Proliferative Retinopathy and Diabetic Macular Edema, both advanced stages of Diabetic Retinopathy (DR). This type of treatment leaves scars on the retina derived from the laser incidence. We will call these scars laser marks. Currently, DR screening programs rely on automatic diagnostic algorithms that detect DR-related lesions. Laser marks may deteriorate the performance of these systems, hence it is important to detect them.

The Laser Mark Dataset (LMD) is a database that enables comparative studies on segmentation of laser marks in retinal images. The research community is invited to test their laser mark detection algorithms on this database.

The LMD is divided in two different groups of images: one where the images were acquired during a DR program (Diabetic Retinopathy Screening) and the other one where the images were captured in a clinical environment (Before and After Photocoagulation Treatment). This page provides the download links of both datasets containing retinal images with and without laser marks (Figure 1).

Figure 1: Retinal image with laser marks (left) and retinal image without laser marks (right).

Laser Marks Dataset - Diabetic Retinopathy Screening (LMD-DRS)

The LMD-DRS contains 203 retinal images manually classified by experts as having laser marks from an ongoing DR screening program in Portugal. All of the images are non-mydriatic and have a 45 degree FOV and they were acquired in 2014. There are 26 images captured using Nidek AFC-330 Retinal Camera and with a resolution of 1920 by 1920 pixels. The remaining 177 images were captured using Canon CR6-45NM Retinal Camera and have a resolution of 768 by 584 pixels.

It also includes 419 retinal images without laser marks from the same DR screening program in the same time interval. There are 68 images that were captured using a Nidek AFC-330 Retinal Camera: 18 have a resolution of 2448 by 2448 and 50 have a resolution of 1920 by 1920 pixels. There is one image captured using a CSO Cobra Retinal Camera with 60 degree x45 degree FOV and a resolution of 1624 by 1232 pixels. The remaining 350 images were captured using a Canon CR6-45NM Retinal Camera and have a resolution of 768 by 584 pixels. Amongst the 419 images without laser marks, there are some that present lesions related to DR.

Each image corresponds to a different patient, so the total number of patients that contributed to the constitution of this specific dataset is equal to the total number of images: 622.

The images were kindly provided by Association for Innovation and Biomedical Research on Light (AIBILI).

Laser Marks Dataset - Before and After Photocoagulation Treatment (LMD-BAPT)

The LMD-BAPT contains 34 retinal images with laser marks and 15 without laser marks. This dataset is composed by retinal images of 9 patients. Each patient contains digital retinal fundus images from before and after the photocoagulation treatment. The images with the letter "A" in their filenames are labeled as "Laser" and the images with the letter "B" in their filenames are labeled as "No Laser".

To sum up, this specific dataset is composed by 9 folders and each one includes images of the retina before the photocoagulation treatment (filenames containing "B") and images of the retina after the photocoagulation treatment (filenames containing "A"). Total number of images: 49.

The images were kindly provided by Centro Cirurgico de Coimbra (CCC).

Download

The 622 digital colour fundus images of the LMD-DRS and the respective excel file with the details can be found here.
The 49 digital colour fundus images of the LMD-BAPT and the respective excel file with the details can be found here.

Reference

Any researcher reporting results that use this database must acknowledge its use by citing the following paper:

Joao G. R. Almeida e Sousa, Carlos Manta Oliveira, Luis A. da Silva Cruz, "Automatic Detection of Laser Marks in Retinal Digital Fundus Images", 2016 24th European Signal Processing Conference (EUSIPCO) EUSIPCO, pp. 1313-1317, August-September 2016.

Disclaimer

Permission is granted to the research community to test their laser mark detection algorithms on this database and share the results with other researchers. The data included in this database can be used, free of charge, for research and educational purposes. Copying, redistribution, and any unauthorized commercial use is prohibited.

To ensure the utmost protection of patient privacy, information that might allow the identity of a patient to be reconstructed has been removed and we have no actual knowledge that the images could be used alone or in combination to identify any subject. To minimize any further risk of breach of privacy, the use of this database is restricted to those individuals or organizations that obtained the database directly from this website.

Acknowlegment

The authors would like to thank AIBILI and CCC, in the persons of their directors, respectively, Dr. Jose Cunha-Vaz and Dr. Antonio Travassos for kindly providing and authorizing the use and publication of the databases LMD-DRS and LMD-BAPT. The authors would also like to thank Retmarker S.A. team for proposing this topic and providing support whenever needed.

Any doubt concerning the Laser Marks Dataset, please contact lcruz@deec.uc.pt or caoliveira@retmarker.com

Last revised September 2016