Intrafraction organ movement in adaptive MR-guided radiotherapy of abdominal lesions - dosimetric impact and how to detect its extent in advance
INTRODUCTION: Magnetic resonance guided radiotherapy (MRgRT) allows daily adaptation of treatment plans to compensate for positional changes of target volumes and organs at risk (OARs). However, current adaptation times are relatively long and organ movement occurring during the adaptation process m...
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| Hauptverfasser: | , , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
25 June 2024
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| In: |
Radiation oncology
Year: 2024, Jahrgang: 19, Pages: 1-11 |
| ISSN: | 1748-717X |
| DOI: | 10.1186/s13014-024-02466-x |
| Online-Zugang: | Verlag, kostenfrei, Volltext: https://doi.org/10.1186/s13014-024-02466-x
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| Verfasserangaben: | Carolin Buchele, C. Katharina Renkamp, Sebastian Regnery, Rouven Behnisch, Carolin Rippke, Fabian Schlüter, Philipp Hoegen-Saßmannshausen, Jürgen Debus, Juliane Hörner-Rieber, Markus Alber and Sebastian Klüter |
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| 245 | 1 | 0 | |a Intrafraction organ movement in adaptive MR-guided radiotherapy of abdominal lesions - dosimetric impact and how to detect its extent in advance |c Carolin Buchele, C. Katharina Renkamp, Sebastian Regnery, Rouven Behnisch, Carolin Rippke, Fabian Schlüter, Philipp Hoegen-Saßmannshausen, Jürgen Debus, Juliane Hörner-Rieber, Markus Alber and Sebastian Klüter |
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| 520 | |a INTRODUCTION: Magnetic resonance guided radiotherapy (MRgRT) allows daily adaptation of treatment plans to compensate for positional changes of target volumes and organs at risk (OARs). However, current adaptation times are relatively long and organ movement occurring during the adaptation process might offset the benefit gained by adaptation. The aim of this study was to evaluate the dosimetric impact of these intrafractional changes. Additionally, a method to predict the extent of organ movement before the first treatment was evaluated in order to have the possibility to compensate for them, for example by adding additional margins to OARs. - MATERIALS & METHODS: Twenty patients receiving adaptive MRgRT for treatment of abdominal lesions were retrospectively analyzed. Magnetic resonance (MR) images acquired at the start of adaptation and immediately before irradiation were used to calculate adapted and pre-irradiation dose in OARs directly next to the planning target volume. The extent of organ movement was determined on MR images acquired during simulation sessions and adaptive treatments, and their agreement was evaluated. Correlation between the magnitude of organ movement during simulation and the duration of simulation session was analyzed in order to assess whether organ movement might be relevant even if the adaptation process could be accelerated in the future. - RESULTS: A significant increase in dose constraint violations was observed from adapted (6.9%) to pre-irradiation (30.2%) dose distributions. Overall, OAR dose increased significantly by 4.3% due to intrafractional organ movement. Median changes in organ position of 7.5 mm (range 1.5-10.5 mm) were detected within a median time of 17.1 min (range 1.6-28.7 min). Good agreement was found between the range of organ movement during simulation and adaptation (66.8%), especially if simulation sessions were longer and multiple MR images were acquired. No correlation was determined between duration of simulation sessions and magnitude of organ movement. - CONCLUSION: Intrafractional organ movement can impact dose distributions and lead to violations of OAR tolerance doses, which impairs the benefit of daily on-table plan adaptation. By application of simulation images, the extent of intrafractional organ movement can be predicted, which possibly allows to compensate for them. | ||
| 650 | 4 | |a Abdominal Neoplasms | |
| 650 | 4 | |a Aged | |
| 650 | 4 | |a Dose Fractionation, Radiation | |
| 650 | 4 | |a Female | |
| 650 | 4 | |a Humans | |
| 650 | 4 | |a Image-guided Radiotherapy (IGRT) | |
| 650 | 4 | |a Intrafraction organ movement | |
| 650 | 4 | |a Magnetic Resonance Imaging | |
| 650 | 4 | |a Male | |
| 650 | 4 | |a Middle Aged | |
| 650 | 4 | |a Movement | |
| 650 | 4 | |a MR-guided adaptive radiotherapy | |
| 650 | 4 | |a Organs at Risk | |
| 650 | 4 | |a Plan adaptation | |
| 650 | 4 | |a Radiotherapy Dosage | |
| 650 | 4 | |a Radiotherapy Planning, Computer-Assisted | |
| 650 | 4 | |a Radiotherapy, Image-Guided | |
| 650 | 4 | |a Radiotherapy, Intensity-Modulated | |
| 650 | 4 | |a Retrospective Studies | |
| 650 | 4 | |a Stereotactic ablative radiotherapy (SABR) | |
| 650 | 4 | |a Stereotactic body Radiotherapy (SBRT) | |
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