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The joint analysis of these multimodal images is of increasing interest since each of them provides common and complementary visual information. However, if we want to facilitate the comparison of two images, obtained with different techniques and containing the same retinal region of interest, it will be necessary to make a previous registration of both images. Here, we present a weakly supervised deep learning methodology for robust deformable registration of multimodal retinal images, which is applied to implement a method for the registration of fluorescein angiography (FA) and optical coherence tomography angiography (OCTA) images. This methodology is strongly inspired by VoxelMorph, a general unsupervised deep learning framework of the state of the art for deformable registration of unimodal medical images. The method was evaluated in a public dataset with 172 pairs of FA and superficial plexus OCTA images. The degree of alignment of the common information (blood vessels) and preservation of the non-common information (image background) in the transformed image were measured using the Dice coefficient (DC) and zero-normalized cross-correlation (ZNCC), respectively. The average values of the mentioned metrics, including the standard deviations, were DC = 0.72\u00a0 \u00b1 \u00a00.10 and ZNCC = 0.82\u00a0 \u00b1 \u00a00.04. The time required to obtain each pair of registered images was 0.12\u00a0s. These results outperform rigid and deformable registration methods with which our method was compared.<\/jats:p>","DOI":"10.1007\/s00521-023-08454-8","type":"journal-article","created":{"date-parts":[[2023,3,28]],"date-time":"2023-03-28T12:02:56Z","timestamp":1680004976000},"page":"14779-14797","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Deformable registration of multimodal retinal images using a weakly supervised deep learning approach"],"prefix":"10.1007","volume":"35","author":[{"given":"Javier","family":"Mart\u00ednez-R\u00edo","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7487-745X","authenticated-orcid":false,"given":"Enrique J.","family":"Carmona","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Daniel","family":"Cancelas","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jorge","family":"Novo","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Marcos","family":"Ortega","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2023,3,28]]},"reference":[{"issue":"3","key":"8454_CR1","doi-asserted-by":"publisher","first-page":"198","DOI":"10.1089\/tmj.2015.0068","volume":"22","author":"N Panwar","year":"2016","unstructured":"Panwar N, Huang P, Lee J, Keane PA, Chuan TS, Richhariya A, Teoh S, Lim TH, Agrawal R (2016) Fundus photography in the 21st century: a review of recent technological advances and their implications for worldwide healthcare. 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