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http://hdl.handle.net/1942/28203
Title: | A novel rectal applicator for contact radiotherapy with HDR Ir-192 sources | Authors: | Bellezzo, Murillo Fonseca, Gabriel P. Verrijssen, An-Sofie Voncken, Robert Van den Bosch, Michiel R. Yoriyaz, Helio RENIERS, Brigitte Berbee, Maaike Van Limbergen, Evert J. Verhaegen, Frank |
Issue Date: | 2018 | Source: | Brachytherapy, 17(6), p. 1037-1044 | Abstract: | Purpose Dose escalation to rectal tumors leads to higher complete response rates and may thereby enable omission of surgery. Important advantages of endoluminal boosting techniques include the possibility to apply a more selective/localized boost than using external beam radiotherapy. A novel brachytherapy (BT) rectal applicator with lateral shielding was designed to be used with a rectoscope for eye-guided positioning to deliver a dose distribution similar to the one of contact x-ray radiotherapy devices, using commonly available high-dose-rate 192Ir BT sources. Methods and Materials A cylindrical multichannel BT applicator with lateral shielding was designed by Monte Carlo modeling, validated experimentally with film dosimetry and compared with results found in the literature for the Papillon 50 (P50) contact x-ray radiotherapy device regarding rectoscope dimensions, radiation beam shape, dose fall-off, and treatment time. Results The multichannel applicator designed is able to deliver 30 Gy under 13 min with a 20350 U (5 Ci) source. The use of multiple channels and lateral shielding provide a uniform circular treatment surface with 22 mm in diameter. The resulting dose fall-off is slightly steeper (maximum difference of 5%) than the one generated by the P50 device with the 22 mm applicator. Conclusions A novel multichannel rectal applicator for contact radiotherapy with high-dose-rate 192Ir sources that can be integrated with commercially available treatment planning systems was designed to produce a dose distribution similar to the one obtained by the P50 device. | Keywords: | Brachytherapy; Monte Carlo; Contact radiotherapy; Rectal applicator | Document URI: | http://hdl.handle.net/1942/28203 | ISSN: | 1538-4721 | e-ISSN: | 1873-1449 | DOI: | 10.1016/j.brachy.2018.07.012 | ISI #: | 000451361500028 | Rights: | 2018 American Brachytherapy Society. Published by Elsevier Inc. All rights reserved. | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2019 |
Appears in Collections: | Research publications |
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bellezzo2018.pdf Restricted Access | Published version | 1.06 MB | Adobe PDF | View/Open Request a copy |
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