Dosimetric evaluation of a patient-specific 3D-printed oral positioning stent for head-and-neck radiotherapy
| Autor: | Elise Obereigner, Jamie Trapp, Jodi Dawes, Tanya Kairn, Tania Poroa, Scott Crowe, Philip Chan, Charles P. Lin, Lizbeth Kenny, Benjamin Chua, Susannah Cleland, Samuel C. Peet |
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| Rok vydání: | 2021 |
| Předmět: |
3d printed
Radiological and Ultrasound Technology Varian Eclipse business.industry medicine.medical_treatment Biomedical Engineering Biophysics Stent Patient specific equipment and supplies Imaging phantom Head and neck radiotherapy medicine Dosimetry Radiology Nuclear Medicine and imaging business Nuclear medicine Radiation treatment planning Instrumentation Biotechnology |
| Zdroj: | Physical and Engineering Sciences in Medicine. 44:887-899 |
| ISSN: | 2662-4737 2662-4729 |
| DOI: | 10.1007/s13246-021-01025-y |
| Popis: | As head-and-neck radiotherapy treatments become more complex and sophisticated, and the need to control and stabilise the positioning of intra-oral anatomy becomes more important, leading the increasing use of oral positioning stents during head-and-neck radiotherapy simulation and delivery. As an alternative to the established practice of creating oral positioning stents using wax, this study investigated the use of a 3D printing technique. An Ender 5 3D printer (Creality 3D, Shenzhen, China) was used, with PLA+ “food-safe” polylactic acid filament (3D Fillies, Dandenong South, Australia), to produce a low-density 3D printed duplicate of a conventional wax stent. The physical and dosimetric effects of the two stents were evaluated using radiochromic film in a solid head phantom that was modified to include flexible parts. The Varian Eclipse treatment planning system (Varian Medical Systems, Palo Alto, USA) was used to calculate the dose from two different head-and-neck treatment plans for the phantom with each of the two stents. Examination of the resulting four dose distributions showed that both stents effectively pushed sensitive oral tissues away from the treatment targets, even though most of the phantom was solid. Film measurements confirmed the accuracy of the dose calculations from the treatment planning system, despite the steep density gradients in the treated volume, and demonstrated that the 3D print could be a suitable replacement for the wax stent. This study demonstrated a useful method for dosimetrically testing novel oral positioning stents. We recommend the development of flexible phantoms for future studies. |
| Databáze: | OpenAIRE |
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