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Adaptive Radiation Therapy in Intensity-Modulated Radiation Therapy for Head and Neck Cancer

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Intensity-Modulated Radiation Therapy

Abstract

The term adaptive radiation therapy (ART) refers to an approach to detecting and correcting the effects of variations in tumors and normal tissues between RT sessions via online or offline modification of original treatment plans. The term image-guided radiation therapy (IGRT) refers to the first component of ART, that is, the detection of changes. The ultimate intent of ART, to appropriately modify a radiation treatment plan to account for temporal changes in anatomy, is distinct from that of IGRT. Ideally, ART would involve imaging the target areas of interest while the patient is in a room used for treatment and sending the resultant in-room volumetric images to a treatment-planning system, where a new treatment plan can be created to account for the current anatomy and sent back to the treatment machine for delivery, either immediately (“online correction”) or during later treatments (“offline correction”). In treatment of head and neck cancer, most anatomic changes take place gradually during the first few weeks of treatment, and thus, offline ART may be the more practical approach in most cases. Whether online or offline, current ART strategies remain labor- and resource-intensive. With the development of new technology such as deformable image registration, offline ART has become feasible for clinical use. The dosimetric advantage of ART for reducing the dose to the various organs at risk (e.g., the parotid glands and spinal cord in head and neck cancer) over the course of treatment is readily apparent. Several prospective studies have demonstrated the feasibility and dosimetric advantages of ART for head and neck cancer. However, because implementation of ART can be costly in terms of new equipment and staffing, it is important to demonstrate that the dosimetric advantages of ART can translate into clinical benefit.

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Acknowledgments

This study was supported in part by a Grant-in-Aid for Cancer Research (H23-009, H26-090) from the Ministry of Health, Labour, and Welfare of Japan and by a Grant-in-Aid for Scientific Research (25461932) from the Ministry of Education, Culture, Sports, Science, and Technology, Japan.

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Correspondence to Yasumasa Nishimura M.D., Ph.D. .

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Nishimura, Y. (2015). Adaptive Radiation Therapy in Intensity-Modulated Radiation Therapy for Head and Neck Cancer. In: Nishimura, Y., Komaki, R. (eds) Intensity-Modulated Radiation Therapy. Springer, Tokyo. https://doi.org/10.1007/978-4-431-55486-8_6

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  • DOI: https://doi.org/10.1007/978-4-431-55486-8_6

  • Publisher Name: Springer, Tokyo

  • Print ISBN: 978-4-431-55485-1

  • Online ISBN: 978-4-431-55486-8

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