Dosimetric evaluation of IMRT Step and Shoot/ Sliding and Window (SS / SW) and VMAT Treatment Plans for Nasopharyngeal Cancer
Introduction: Radiotherapy of Oto-Rhino-Laryngology (ORL) sphere is difficult due to complex geometries and very sensitive organs around the target volume. This weapon has benefited from the advances of the Volumetric Modulated Arc Therapy (VMAT) technique that combines the advantages of dynamic arc...
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| Format: | Article |
| Language: | English |
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Mashhad University of Medical Sciences
2022-01-01
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| Series: | Iranian Journal of Medical Physics |
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| Online Access: | https://ijmp.mums.ac.ir/article_18005_94c651d4cb06c12a9546e86c813a9a1e.pdf |
| _version_ | 1797209611547181056 |
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| author | Rachid Errifai Youssef Bouzekraoui FARIDA BENTAYEB |
| author_facet | Rachid Errifai Youssef Bouzekraoui FARIDA BENTAYEB |
| author_sort | Rachid Errifai |
| collection | DOAJ |
| description | Introduction: Radiotherapy of Oto-Rhino-Laryngology (ORL) sphere is difficult due to complex geometries and very sensitive organs around the target volume. This weapon has benefited from the advances of the Volumetric Modulated Arc Therapy (VMAT) technique that combines the advantages of dynamic arc therapy techniques with those of Conformal Radiotherapy with Intensity Modulated (CRIM) by stationary beams.Material and Methods: The treatment plans of 10 patients were compared and treated with Intensity Modulated Radiation Therapy (IMRT) Step and Shoot (SS), Sliding window (SW), and VMAT (6MV X-ray beam). Three target volumes were used: PTVث Gy, PTV 63 Gy, and PTV 56 Gy. The organs at risk were the spinal cord, the brainstem, the parotid gland. The dose was delivered once a day, five days a week and in 35 sessions in Simultaneous Integrated Boost (SIB).Results: The SS technique permitted better parotid sparing, inducting thus to limiting late complications such as xerostomia. The VMAT technique led to better protection of the brainstem by reducing about 6 Gy while for the spinal cord the doses received were almost equal. There was no statistically significant difference between the different techniques.Conclusion: The results confirm the conformational capacities of these innovative techniques, from a dosimetric and above all clinical point of view as well as their ability to cover the target volumes while largely respecting the constraints on organs at risk. |
| first_indexed | 2024-04-24T09:57:27Z |
| format | Article |
| id | doaj.art-3179bb6154204f89871f9ed15580fccc |
| institution | Directory Open Access Journal |
| issn | 2345-3672 |
| language | English |
| last_indexed | 2024-04-24T09:57:27Z |
| publishDate | 2022-01-01 |
| publisher | Mashhad University of Medical Sciences |
| record_format | Article |
| series | Iranian Journal of Medical Physics |
| spelling | doaj.art-3179bb6154204f89871f9ed15580fccc2024-04-14T06:28:28ZengMashhad University of Medical SciencesIranian Journal of Medical Physics2345-36722022-01-01191314210.22038/ijmp.2021.53524.187918005Dosimetric evaluation of IMRT Step and Shoot/ Sliding and Window (SS / SW) and VMAT Treatment Plans for Nasopharyngeal CancerRachid Errifai0Youssef Bouzekraoui1FARIDA BENTAYEB2Department of Physics, LPHE, Modeling and Simulations, Faculty of Science, Mohammed V University, Rabat, MoroccoHassan First University of Settat, High Institute of Health Sciences, Laboratory of Sciences and Health Technologies, Settat, MoroccoDepartment of Physics, LPHE, Modeling and Simulations, Faculty of Science, Mohammed V University, Rabat, MoroccoIntroduction: Radiotherapy of Oto-Rhino-Laryngology (ORL) sphere is difficult due to complex geometries and very sensitive organs around the target volume. This weapon has benefited from the advances of the Volumetric Modulated Arc Therapy (VMAT) technique that combines the advantages of dynamic arc therapy techniques with those of Conformal Radiotherapy with Intensity Modulated (CRIM) by stationary beams.Material and Methods: The treatment plans of 10 patients were compared and treated with Intensity Modulated Radiation Therapy (IMRT) Step and Shoot (SS), Sliding window (SW), and VMAT (6MV X-ray beam). Three target volumes were used: PTVث Gy, PTV 63 Gy, and PTV 56 Gy. The organs at risk were the spinal cord, the brainstem, the parotid gland. The dose was delivered once a day, five days a week and in 35 sessions in Simultaneous Integrated Boost (SIB).Results: The SS technique permitted better parotid sparing, inducting thus to limiting late complications such as xerostomia. The VMAT technique led to better protection of the brainstem by reducing about 6 Gy while for the spinal cord the doses received were almost equal. There was no statistically significant difference between the different techniques.Conclusion: The results confirm the conformational capacities of these innovative techniques, from a dosimetric and above all clinical point of view as well as their ability to cover the target volumes while largely respecting the constraints on organs at risk.https://ijmp.mums.ac.ir/article_18005_94c651d4cb06c12a9546e86c813a9a1e.pdfnasopharyngeal cancerradiotherapyimrtvmatdose |
| spellingShingle | Rachid Errifai Youssef Bouzekraoui FARIDA BENTAYEB Dosimetric evaluation of IMRT Step and Shoot/ Sliding and Window (SS / SW) and VMAT Treatment Plans for Nasopharyngeal Cancer Iranian Journal of Medical Physics nasopharyngeal cancer radiotherapy imrt vmat dose |
| title | Dosimetric evaluation of IMRT Step and Shoot/ Sliding and Window (SS / SW) and VMAT Treatment Plans for Nasopharyngeal Cancer |
| title_full | Dosimetric evaluation of IMRT Step and Shoot/ Sliding and Window (SS / SW) and VMAT Treatment Plans for Nasopharyngeal Cancer |
| title_fullStr | Dosimetric evaluation of IMRT Step and Shoot/ Sliding and Window (SS / SW) and VMAT Treatment Plans for Nasopharyngeal Cancer |
| title_full_unstemmed | Dosimetric evaluation of IMRT Step and Shoot/ Sliding and Window (SS / SW) and VMAT Treatment Plans for Nasopharyngeal Cancer |
| title_short | Dosimetric evaluation of IMRT Step and Shoot/ Sliding and Window (SS / SW) and VMAT Treatment Plans for Nasopharyngeal Cancer |
| title_sort | dosimetric evaluation of imrt step and shoot sliding and window ss sw and vmat treatment plans for nasopharyngeal cancer |
| topic | nasopharyngeal cancer radiotherapy imrt vmat dose |
| url | https://ijmp.mums.ac.ir/article_18005_94c651d4cb06c12a9546e86c813a9a1e.pdf |
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