{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,24]],"date-time":"2026-06-24T20:57:07Z","timestamp":1782334627083,"version":"3.54.5"},"reference-count":13,"publisher":"Wiley","issue":"9","license":[{"start":{"date-parts":[[2023,5,30]],"date-time":"2023-05-30T00:00:00Z","timestamp":1685404800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["aapm.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["J Applied Clin Med Phys"],"published-print":{"date-parts":[[2023,9]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Purpose<\/jats:title><jats:p>To investigate the dosimetric effect of six degrees of freedom (6DoF) couch top with rotational corrections in proton therapy (PT).<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>The water equivalent thickness (WET) was measured using a proton beam with a 6DoF couch top and patient immobilization base plate (PIBP) placed in front of a motorized water phantom. The accuracy verification was performed with the beam axis set perpendicular to the 6DoF couch top and tilted in 10\u00b0 steps from 10\u00b0 to 30\u00b0. Up to 3\u00b0 rotational correction may be added during the actual treatment to correct the rotational setup error on our system. The measured and calculated values using the treatment planning system were compared. Additionally, the effect of the 3\u00b0 difference was evaluated using actual measurements concerning each angle on the proton beam range.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The WET of the 6DoF couch top and PIBP were 8.5\u00a0\u00b1\u00a00.1\u00a0mm and 6.8\u00a0\u00b1\u00a00.1\u00a0mm, respectively. The calculation and the actual measurement at each angle agreed within 0.2\u00a0mm at the maximum. A maximum difference of approximately 0.6\u00a0mm was confirmed when tilted at 3\u00b0 following 30\u00b0 with the 6DoF couch top plus PIBP.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>The dosimetric effect of the 6DoF couch top with rotational corrections in PT differs depending on the incidence angle on the couch top, and it increased with the increased oblique angle of incidence. However, the effect on the range was as small as 0.6\u00a0mm at the maximum. The amount of rotational correction, the angle of incidence of the beam, and the effect of rotational corrections on the proton beam range may differ depending on the structure of the couch top. Therefore, sufficient prior confirmation, and subsequent periodical quality assurance management are important.<\/jats:p><\/jats:sec>","DOI":"10.1002\/acm2.14043","type":"journal-article","created":{"date-parts":[[2023,5,31]],"date-time":"2023-05-31T05:42:32Z","timestamp":1685511752000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Dosimetric effect of six degrees of freedom couch top with rotational setup error corrections in proton therapy"],"prefix":"10.1002","volume":"24","author":[{"given":"Takahiro","family":"Kato","sequence":"first","affiliation":[{"name":"Department of Radiological Sciences School of Health Sciences Fukushima Medical University  Fukushima Japan"},{"name":"Department of Radiation Physics and Technology Southern Tohoku Proton Therapy Center  Fukushima 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