{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,7,30]],"date-time":"2025-07-30T14:05:48Z","timestamp":1753884348398,"version":"3.41.2"},"reference-count":27,"publisher":"Oxford University Press (OUP)","issue":"1","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["BJR|Open"],"published-print":{"date-parts":[[2023,8]]},"abstract":"<jats:sec><jats:title>Objective:<\/jats:title><jats:p> Intensity-modulated radiotherapy (IMRT) is a well-established radiotherapy technique for delivering radiation to cancer with high conformity while sparing the surrounding normal tissue. Two main purposes of this study are: (1) to investigate dose calculation accuracy of helical IMRT (HIMRT) and volumetric-modulated arc therapy (VMAT) on surface region and (2) to evaluate the dosimetric efficacy of HIMRT and VMAT for scalp-sparing in whole brain radiotherapy (WBRT). <\/jats:p><\/jats:sec><jats:sec><jats:title>Methods:<\/jats:title><jats:p> First, using a radiochromic film and water-equivalent phantom with three types of boluses (1, 3, 5 mm), calculation\/measurement dose agreement at the surface region in the VMAT and HIMRT plans were examined. Then, HIMRT, 6MV-VMAT and 10MV-VMAT with scalp-sparing, and two conventional three-dimensional conformal radiotherapy plans (6MV-3DCRT and 10MV-3DCRT; as reference data) were created for 30 patients with brain metastasis (30 Gy\/10 fractions). The mean dose to the scalp and the scalp volume receiving 24 and 30 Gy were compared. <\/jats:p><\/jats:sec><jats:sec><jats:title>Results:<\/jats:title><jats:p> The percentage dose differences between the calculation and measurement were within 7%, except for the HIMRT plan at a depth of 1 mm. The averaged mean scalp doses [Gy], V24Gy [%], and V30Gy [%] (1SD) for 6MV-3DCRT, 10MV-3DCRT, HIMRT, 6MV-VMAT, and 10MV-VMAT were [26.6 (1.1), 86.4 (7.3), 13.2 (4.2)], [25.4 (1.0), 77.8 (7.5), 13.2 (4.2)], [23.2 (1.5), 42.8 (19.2), 0.2 (0.5)], [23.6 (1.6), 47.5 (17.9), 1.2 (1.8)], and [22.7 (1.7), 36.4 (17.6), 0.7 (1.1)], respectively. <\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion:<\/jats:title><jats:p> Regarding the dose parameters, HIMRT achieved a lower scalp dose compared with 6MV-VMAT. However, the highest ability to reduce the mean scalp dose was showed in 10MV-VMAT. <\/jats:p><\/jats:sec><jats:sec><jats:title>Advances in knowledge:<\/jats:title><jats:p> Scalp-sparing WBRT using HIMRT or VMAT may prevent radiation-induced alopecia in patients with BM. <\/jats:p><\/jats:sec>","DOI":"10.1259\/bjro.20220037","type":"journal-article","created":{"date-parts":[[2023,3,22]],"date-time":"2023-03-22T16:53:36Z","timestamp":1679504016000},"source":"Crossref","is-referenced-by-count":1,"title":["Dosimetric investigation of whole-brain radiotherapy with helical intensity modulated radiation therapy and volumetric modulated arc therapy for scalp sparing"],"prefix":"10.1093","volume":"5","author":[{"given":"Ryosuke","family":"Shirata","sequence":"first","affiliation":[{"name":"Department of Radiation Oncology, Graduate School of Medicine, Juntendo University, 2-1-1 Hongo, Bunkyo-ku, Tokyo, Japan"},{"name":"Department of Radiation Oncology, Shonan Kamakura General Hospital, 1370-1 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