eISSN: 2081-2841
ISSN: 1689-832X
Journal of Contemporary Brachytherapy
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5/2021
vol. 13
 
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abstract:
Original paper

Using magnetic material to repulse electrons in Axxent eBT for skin preservation during early-stage breast cancer conservative intra-operative radiotherapy

Li Wang
1
,
Jia-Ming Wu
2, 3

1.
Department of Radiation Oncology, Yunnan Tumor Hospital, the Third Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, China
2.
Department of Heavy Ion Center of Wuwei Cancer Hospital, Gansu Wuwei Academy of Medical Sciences; Gansu Wuwei Tumor Hospital, Wuwei City, China
3.
Department of Medical Physics, Chengde Medical University, Chengde City, Hebei Province, China
J Contemp Brachytherapy 2021; 13, 5: 575–582
Online publish date: 2021/10/20
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A miniature electronic X-ray source was employed in this study to deliver intra-operative radiotherapy (IORT) within breast lesions. A flexible magnetic material was used to reduce breast skin radiation damage. Total prescribed dose was 20 Gy at balloon surface, with breast tumor bed wrapped around balloon applicator. A flexible magnetic material, called ‘neodymium-iron boron’ (NdFeB) + alloy-49 was applied to cover lesion’s surface to preserve the skin and to reduce electron contamination raised from photon-induced low-energy electrons, with tissue less than 1 cm between applicator surface and breast skin. The reduction of electron contamination using NdFeB + alloy-49 with an applicator-skin distance of 20 mm, ranged from 7% to 10%, while with an applicator-skin distance of 10 mm for balloon volumes from 30 to 50 cm3, it ranged from 4% to 6% only. NdFeB + alloy-49 magnetic material was efficient in repulsing photon-induced low-energy electrons for skin preservation to compensate for deficiency of tissue over less than 1 cm gap between the surface of applicator and the breast skin.
keywords:

neodymium-iron boron magnet, electronic brachytherapy, early-stage breast cancer, IORT, skin dose, skin sparing, alloy-49

 
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