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The four\u2010field box technique using a head\u2010tilting device has been reported to reduce the parotid gland dose by excluding it from the radiation field. This study aimed to determine the appropriate head tilt angle to reduce the parotid gland dose in the four\u2010field box technique. The bilateral, anterior, and posterior beams were set for each of ten patients. The orbitomeatal plane angle (OMPA) was introduced as an indicator that expresses the head tilt angle. Next, principal component analysis (PCA) was performed to understand the interrelationship between variables (dosimetric parameters of the lens and parotid gland and OMPA). In PCA, the angle between the OMPA vector and maximum lens dose or mean parotid gland dose vector was approximately opposite or close, indicating a negative or positive correlation [r\u00a0=\u00a0\u22120.627 (<jats:italic>p<\/jats:italic>\u00a0&lt;\u00a00.05) or 0.475 (<jats:italic>p<\/jats:italic>\u00a0&lt;\u00a00.05), respectively]. The OMPA that reduced the maximum lens dose to &lt;10\u00a0Gy with a 95% confidence interval was approximately 14\u00b0. If the lens dose was not considered, the parotid gland dose could be reduced by decreasing the OMPA.<\/jats:p>","DOI":"10.1002\/acm2.13151","type":"journal-article","created":{"date-parts":[[2021,1,15]],"date-time":"2021-01-15T03:56:03Z","timestamp":1610682963000},"page":"49-57","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Examination of the best head tilt angle to reduce the parotid gland dose maintaining a safe level of lens dose in whole\u2010brain radiotherapy using the four\u2010field box technique"],"prefix":"10.1002","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6633-0964","authenticated-orcid":false,"given":"Hidetoshi","family":"Shimizu","sequence":"first","affiliation":[{"name":"Department of Radiation Oncology Aichi Cancer Center Hospital Nagoya Aichi 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