{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,7,30]],"date-time":"2025-07-30T12:07:42Z","timestamp":1753877262519,"version":"3.41.2"},"reference-count":17,"publisher":"Oxford University Press (OUP)","license":[{"start":{"date-parts":[[2022,7,12]],"date-time":"2022-07-12T00:00:00Z","timestamp":1657584000000},"content-version":"vor","delay-in-days":1,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>We evaluated the basic characteristics and efficacy of our newly developed patient fixation system for head and neck radiotherapy that uses a dedicated mouthpiece and dental impression materials. The present investigation demonstrated that with this system, the changes in the absorbed dose to water depending on the material of the mouthpiece were small, with a maximum of 0.32% for a 10-MV photon beam. For the dental impression material, we selected a silicone material with the lowest Hounsfield unit (HU) value that had little effect on the generation of artifacts and the quality of the X-ray beam. Multiphase magnetic resonance imaging (MRI) revealed that the head-up and -down motions in the thermoplastic shell without the mouthpiece were 5.76\u2009\u00b1\u20091.54\u00a0mm, whereas the motion with the mouthpiece decreased significantly to 1.72\u2009\u00b1\u20090.92\u00a0mm (P\u2009=\u20090.006). Similarly, the head-left and -right motion displacement decreased from 6.32\u2009\u00b1\u20091.86\u00a0mm without the mouthpiece to 1.80\u2009\u00b1\u20090.42\u00a0mm with the mouthpiece (P\u2009=\u20090.003). Regarding the tongue depressor function of the mouthpiece, the median distance from the hard palate to the surface of the tongue was 28.42\u00a0mm. The present results indicate that the new immobilization device developed herein that uses a mouthpiece and a thermoplastic shell is useful for suppressing patients\u2019 head motions and tongue positions.<\/jats:p>","DOI":"10.1093\/jrr\/rrac044","type":"journal-article","created":{"date-parts":[[2022,7,12]],"date-time":"2022-07-12T04:57:09Z","timestamp":1657601829000},"source":"Crossref","is-referenced-by-count":0,"title":["A newly developed patient fixation system using a dedicated mouthpiece and dental impression materials for head and neck radiotherapy: a preliminary study"],"prefix":"10.1093","author":[{"given":"Masataka","family":"Sakamoto","sequence":"first","affiliation":[{"name":"Department of Radiology , Hamamatsu University Hospital, Handayama 1-20-1, Higashi-ku, Hamamatsu, Shizuoka, 431-3192 , Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kenta","family":"Konishi","sequence":"additional","affiliation":[{"name":"Department of Radiation Oncology , Hamamatsu University School of Medicine, Handayama 1-20-1, Higashi-ku, Hamamatsu, Shizuoka, 431-3192 , Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Keiichi","family":"Ohira","sequence":"additional","affiliation":[{"name":"Department of Radiation Oncology , Hamamatsu University School of Medicine, Handayama 1-20-1, Higashi-ku, Hamamatsu, Shizuoka, 431-3192 , Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Masanori","family":"Hirata","sequence":"additional","affiliation":[{"name":"Department of Radiation Oncology , Hamamatsu University School of Medicine, Handayama 1-20-1, Higashi-ku, Hamamatsu, Shizuoka, 431-3192 , Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kohei","family":"Wakabayashi","sequence":"additional","affiliation":[{"name":"Department of Radiation Oncology , Hamamatsu University School of Medicine, Handayama 1-20-1, Higashi-ku, Hamamatsu, Shizuoka, 431-3192 , Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shuhei","family":"Aramaki","sequence":"additional","affiliation":[{"name":"Department of Radiation Oncology , Hamamatsu University School of Medicine, Handayama 1-20-1, Higashi-ku, Hamamatsu, Shizuoka, 431-3192 , Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ryo","family":"Kokubo","sequence":"additional","affiliation":[{"name":"Department of Radiation Oncology , Hamamatsu University School of Medicine, Handayama 1-20-1, Higashi-ku, Hamamatsu, Shizuoka, 431-3192 , Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Katsumasa","family":"Nakamura","sequence":"additional","affiliation":[{"name":"Department of Radiology , Hamamatsu University Hospital, Handayama 1-20-1, Higashi-ku, Hamamatsu, Shizuoka, 431-3192 , Japan"},{"name":"Department of Radiation Oncology , Hamamatsu University School of Medicine, Handayama 1-20-1, Higashi-ku, Hamamatsu, Shizuoka, 431-3192 , Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"286","published-online":{"date-parts":[[2022,7,11]]},"reference":[{"volume-title":"Radiotherapy for Head and Neck Cancers Indications and Techniques","author":"","key":"2022071204570265300_ref1"},{"volume-title":"Radiation Oncology Management\u00fdecisions","author":"","key":"2022071204570265300_ref2"},{"key":"2022071204570265300_ref3","article-title":"Practice of immobilization and veri_cation for external beam radiation therapy","volume":"33","author":"Japanese Society of Radiological Technology","journal-title":"Kyoto: Japanese Society of Radiological Technology"},{"key":"2022071204570265300_ref4","first-page":"1","article-title":"Polypropylene as a promising plastic: a review","volume":"6","author":"Maddah","year":"2016","journal-title":"Am J Polym Sci"},{"key":"2022071204570265300_ref5","first-page":"37","volume-title":"Standard Dosimetry of Absorbed Dose to Water in External Beam Radiotherapy 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