{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,31]],"date-time":"2025-10-31T16:59:22Z","timestamp":1761929962812,"version":"build-2065373602"},"reference-count":37,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2018,8,21]],"date-time":"2018-08-21T00:00:00Z","timestamp":1534809600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100003725","name":"National Research Foundation of Korea","doi-asserted-by":"publisher","award":["NRF-2015R1D1A1A09056828"],"award-info":[{"award-number":["NRF-2015R1D1A1A09056828"]}],"id":[{"id":"10.13039\/501100003725","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100003630","name":"Nuclear Safety and Security Commission","doi-asserted-by":"publisher","award":["1603016"],"award-info":[{"award-number":["1603016"]}],"id":[{"id":"10.13039\/501100003630","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>The patient\u2019s respiratory pattern and reproducibility are important factors affecting the accuracy of radiotherapy for lung cancer or liver cancer cases. Therefore, respiration training is required to induce respiration regularity before radiotherapy. However, the need for specialized personnel, space, and time-consuming training represent limitations. To solve these problems, we have developed a respiratory monitoring and training system based on a micro-electro-mechanical-system (MEMS) magnetic sensor. This system consists of a small attaching magnet, a sensor, and a breathing pattern output device. In this study, we evaluated the performance of the signal measurement in the developed system based on the various respiratory cycles, the amplitudes, and the position angles of the magnet and the sensor. The system can provide a more accurate breathing signal graph with lower measurement error and higher spatial resolution than conventional sensor methods by using additional magnet. In addition, it is possible the patient to monitor and train breathing himself by making it easy to carry and use without restriction of time and space.<\/jats:p>","DOI":"10.3390\/s18092742","type":"journal-article","created":{"date-parts":[[2018,8,21]],"date-time":"2018-08-21T11:12:42Z","timestamp":1534849962000},"page":"2742","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["Design and Evaluation of a MEMS Magnetic Field Sensor-Based Respiratory Monitoring and Training System for Radiotherapy"],"prefix":"10.3390","volume":"18","author":[{"given":"Yoonjin","family":"Oh","sequence":"first","affiliation":[{"name":"Department of Radiation Oncology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351, Korea"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0169-2865","authenticated-orcid":false,"given":"Young-Jin","family":"Jung","sequence":"additional","affiliation":[{"name":"Department of Radiological Science, Dongseo University, Busan 47011, Korea"},{"name":"Center for Radiological Environment &amp; Health Science, Dongseo University, Busan 47011, Korea"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7763-9844","authenticated-orcid":false,"given":"Sang Hyoun","family":"Choi","sequence":"additional","affiliation":[{"name":"Division of Medical Radiation Equipment, Korea Institute of Radiological and Medical Sciences, Seoul 01812, Korea"}]},{"given":"Dong Wook","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Radiation Oncology, Kyung Hee University Hospital at Gangdong, Seoul 05278, Korea"}]}],"member":"1968","published-online":{"date-parts":[[2018,8,21]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"117","DOI":"10.3322\/canjclin.55.2.117","article-title":"Advances in radiation therapy: Conventional to 3D, to IMRT, to 4D, and beyond","volume":"55","author":"Bucci","year":"2005","journal-title":"Cancer J. 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