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Free from metal parts and immune to electromagnetic radiation, fibre-optic sensors have the potential to better control the patient\u2019s condition by providing continuous non-invasive monitoring of the respiratory rate (RR). The study was purposed to assess the relationship between anxiety in MRI patients and their RR acquired by a fibre-optic sensor system. Forty-four subjects were involved in the study. The mean RR values recorded for 2\u2009minutes immediately after the beginning and immediately before the end of the scanning were assessed relative to the State-Trait Anxiety Inventory (STAI) X-1 scores obtained immediately before and immediately after the scanning, respectively. A growth mixture model analysis was performed to statistically differentiate two groups of subjects according to the trends in repeated measures of RR. A significant lowering of the anxiety state was observed in the group characterised by a decrease in RR, whereas essentially no change in anxiety level was observed in the group with a stable RR. The <jats:italic>t<\/jats:italic>-test showed significant differences in changes in anxiety between these groups (<jats:italic>t<\/jats:italic><jats:sub>(39)<\/jats:sub>\u2009=\u2009\u22122.349, <jats:italic>p<\/jats:italic>\u2009=\u20090.012, Cohen\u2019s <jats:italic>d<\/jats:italic>\u2009=\u20092.13).<\/jats:p>","DOI":"10.1038\/s41598-019-40737-w","type":"journal-article","created":{"date-parts":[[2019,3,13]],"date-time":"2019-03-13T11:02:46Z","timestamp":1552474966000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":39,"title":["A study of the relationship between the level of anxiety declared by MRI patients in the STAI questionnaire and their respiratory rate acquired by a fibre-optic sensor system"],"prefix":"10.1038","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1816-4604","authenticated-orcid":false,"given":"\u0141ukasz","family":"Dziuda","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2143-9883","authenticated-orcid":false,"given":"Piotr","family":"Zieli\u0144ski","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Paulina","family":"Baran","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mariusz","family":"Krej","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lech","family":"Kopka","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2019,3,13]]},"reference":[{"key":"40737_CR1","doi-asserted-by":"publisher","first-page":"1322","DOI":"10.1002\/jmri.21147","volume":"26","author":"M Dewey","year":"2007","unstructured":"Dewey, M., Schink, T. & Dewey, C. 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