{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,14]],"date-time":"2026-01-14T19:09:38Z","timestamp":1768417778591,"version":"3.49.0"},"reference-count":33,"publisher":"MDPI AG","issue":"12","license":[{"start":{"date-parts":[[2021,6,9]],"date-time":"2021-06-09T00:00:00Z","timestamp":1623196800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100002341","name":"Academy of Finland","doi-asserted-by":"publisher","award":["314483"],"award-info":[{"award-number":["314483"]}],"id":[{"id":"10.13039\/501100002341","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>We present a novel method for estimating respiratory motion using inertial measurement units (IMUs) based on microelectromechanical systems (MEMS) technology. As an application of the method we consider the amplitude gating of positron emission tomography (PET) imaging, and compare the method against a clinically used respiration motion estimation technique. The presented method can be used to detect respiratory cycles and estimate their lengths with state-of-the-art accuracy when compared to other IMU-based methods, and is the first based on commercial MEMS devices, which can estimate quantitatively both the magnitude and the phase of respiratory motion from the abdomen and chest regions. For the considered test group consisting of eight subjects with acute myocardial infarction, our method achieved the absolute breathing rate error per minute of 0.44 \u00b1 0.23 1\/min, and the absolute amplitude error of 0.24 \u00b1 0.09 cm, when compared to the clinically used respiratory motion estimation technique. The presented method could be used to simplify the logistics related to respiratory motion estimation in PET imaging studies, and also to enable multi-position motion measurements for advanced organ motion estimation.<\/jats:p>","DOI":"10.3390\/s21123983","type":"journal-article","created":{"date-parts":[[2021,6,9]],"date-time":"2021-06-09T14:16:04Z","timestamp":1623248164000},"page":"3983","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["A Respiratory Motion Estimation Method Based on Inertial Measurement Units for Gated Positron Emission Tomography"],"prefix":"10.3390","volume":"21","author":[{"given":"Eero","family":"Lehtonen","sequence":"first","affiliation":[{"name":"Department of Computing, University of Turku, 20014 Turku, Finland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9401-0725","authenticated-orcid":false,"given":"Jarmo","family":"Teuho","sequence":"additional","affiliation":[{"name":"Turku PET Centre, University of Turku and Turku University Hospital, 20521 Turku, Finland"}]},{"given":"Juho","family":"Koskinen","sequence":"additional","affiliation":[{"name":"Department of Computing, University of Turku, 20014 Turku, Finland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4085-4057","authenticated-orcid":false,"given":"Mojtaba","family":"Jafari Tadi","sequence":"additional","affiliation":[{"name":"School of ICT, Faculty of Engineering, Turku University of Applied Sciences, ICT-City, Joukahaisenkatu 3, 20520 Turku, Finland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0982-8360","authenticated-orcid":false,"given":"Riku","family":"Kl\u00e9n","sequence":"additional","affiliation":[{"name":"Turku PET Centre, University of Turku and Turku University Hospital, 20521 Turku, Finland"}]},{"given":"Reetta","family":"Siekkinen","sequence":"additional","affiliation":[{"name":"Department of Computing, University of Turku, 20014 Turku, Finland"},{"name":"Turku PET Centre, University of Turku and Turku University Hospital, 20521 Turku, Finland"},{"name":"Department of Medical Physics, Turku University Hospital, 20521 Turku, Finland"}]},{"given":"Joaquin","family":"Rives Gambin","sequence":"additional","affiliation":[{"name":"Department of Computing, University of Turku, 20014 Turku, Finland"}]},{"given":"Tuija","family":"Vasankari","sequence":"additional","affiliation":[{"name":"Heart Centre, Turku University Hospital, 20521 Turku, Finland"}]},{"given":"Antti","family":"Saraste","sequence":"additional","affiliation":[{"name":"Turku PET Centre, University of Turku and Turku University Hospital, 20521 Turku, Finland"},{"name":"Heart Centre, Turku University Hospital, 20521 Turku, Finland"}]}],"member":"1968","published-online":{"date-parts":[[2021,6,9]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"271","DOI":"10.1016\/j.cpet.2018.12.008","article-title":"Gating Approaches in Cardiac PET Imaging","volume":"14","author":"Lassen","year":"2019","journal-title":"PET Clin."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"14","DOI":"10.1007\/s11886-017-0825-2","article-title":"Enhancing Cardiac PET by Motion Correction Techniques","volume":"19","author":"Rubeaux","year":"2017","journal-title":"Curr. 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