{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,13]],"date-time":"2026-05-13T17:22:43Z","timestamp":1778692963600,"version":"3.51.4"},"reference-count":11,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2017,6,8]],"date-time":"2017-06-08T00:00:00Z","timestamp":1496880000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J Applied Clin Med Phys"],"published-print":{"date-parts":[[2017,7]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Purpose\/objective(s)<\/jats:title><jats:p>Accurate and reproducible positioning of the breast is difficult due to its deformability and softness; thus, targeting a breast tumor or tumor bed with fractionated radiotherapy using external beam radiation is difficult. The aim of this study was to develop a novel bra to aid in breast immobilization in the prone position.<\/jats:p><\/jats:sec><jats:sec><jats:title>Materials &amp; methods<\/jats:title><jats:p>To assess the accuracy of prone position fixation of breast tumors, 33 breast cancer patients with 34 lesions were recruited. The bra used in this verification was customized from a commercially available bra. Duplicate <jats:styled-content style=\"fixed-case\">MRI<\/jats:styled-content> were acquired in the prone position, alternating with and without the bra, and for each series, patients were asked to step off the <jats:styled-content style=\"fixed-case\">MRI<\/jats:styled-content> table and re\u2010set up in the prone position. Patients were also asked to remove and re\u2010fit the bra for the second <jats:styled-content style=\"fixed-case\">MRI<\/jats:styled-content>. Each pair of images were superimposed to match the shape of the skin surface, and the maximum difference in tumor geometric center in three axes was measured. The required set up margin was calculated as: required margin = mean difference in geometric center + 2.5 standard deviation. The volumetric overlap of the tumor, as well as contouring uncertainties, was evaluated using contour analysis software.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The median breast size was 498 cc. The required margins for the lateral, vertical, and longitudinal directions were estimated to be 4.1, 4.1, and 5.0 mm, respectively, with the bra, and 5.1, 6.9, and 6.7 mm, respectively, without the bra. These margins covered the dislocation of more than 33 lesions in total. With the bra, 33 lesions had achieved an objective overlap of 95% and 99% with 2 and 4 mm margins, respectively, whereas 4 and 8 mm, respectively, were needed without the bra.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>The use of an immobilizing bra reduced the setup margin for prone position fixation of breast tumors.<\/jats:p><\/jats:sec>","DOI":"10.1002\/acm2.12116","type":"journal-article","created":{"date-parts":[[2017,6,8]],"date-time":"2017-06-08T11:46:43Z","timestamp":1496922403000},"page":"155-160","source":"Crossref","is-referenced-by-count":9,"title":["Development of the breast immobilization system in prone setup: The effect of bra in prone position to improve the breast setup error"],"prefix":"10.1002","volume":"18","author":[{"given":"Mariko","family":"Kawamura","sequence":"first","affiliation":[{"name":"Department of Radiology Nagoya University Graduate School of Medicine Nagoya Aichi 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