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Magnetic resonance imaging has been widely used in speech-related studies. Moreover, the segmentation of such images of speech organs is required to extract reliable statistical data. However, standard solutions to analyse a large set of articulatory images have not yet been established. Therefore, this article presents an approach to segment the tongue in two-dimensional magnetic resonance images and statistically model the segmented tongue shapes. The proposed approach assesses the articulator morphology based on an active shape model, which captures the shape variability of the tongue during speech production. To validate this new approach, a dataset of mid-sagittal magnetic resonance images acquired from four subjects was used, and key aspects of the shape of the tongue during the vocal production of relevant European Portuguese vowels were evaluated.<\/jats:p>","DOI":"10.1177\/0954411917751000","type":"journal-article","created":{"date-parts":[[2018,1,19]],"date-time":"2018-01-19T07:33:28Z","timestamp":1516347208000},"page":"271-281","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":3,"title":["Segmentation of tongue shapes during vowel production in magnetic resonance images based on statistical modelling"],"prefix":"10.1177","volume":"232","author":[{"given":"Jessica C","family":"Delmoral","sequence":"first","affiliation":[{"name":"Instituto de Ci\u00eancia e Inova\u00e7\u00e3o em Engenharia Mec\u00e2nica e Engenharia Industrial, Faculdade de Engenharia, Universidade do Porto, Porto, Portugal"}]},{"given":"Sandra M","family":"Rua Ventura","sequence":"additional","affiliation":[{"name":"Centro de Estudo do Movimento e Atividade Humana, Escola Superior de Tecnologia da Sa\u00fade do Porto, Instituto Polit\u00e9cnico do Porto, Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7603-6526","authenticated-orcid":false,"given":"Jo\u00e3o Manuel RS","family":"Tavares","sequence":"additional","affiliation":[{"name":"Departamento de Engenharia Mec\u00e2nica, Instituto de Ci\u00eancia e Inova\u00e7\u00e3o em Engenharia Mec\u00e2nica e Engenharia Industrial, Faculdade de Engenharia, Universidade do Porto, Porto, 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