Abstract
Introduction
To guarantee treatment reproducibility and stability, immobilization devices are essential. Additionally, surface-guided radiation therapy (SGRT) serves as an accurate complement to frameless stereotactic radiosurgery (SRS) and stereotactic radiotherapy (SRT) by aiding patient positioning and real-time monitoring, especially when non-coplanar fields are in use. At our institute, we have developed a surface-guided SRS (SG-SRS) workflow that incorporates our innovative open-face mask (OM) and mouth bite (MB) to guarantee a precise and accurate dose delivery.
Methods
This study included 40 patients, and all patients were divided into closed mask (CM) and open-face mask (OM) groups according to different positioning flow. Cone beam computed tomography (CBCT) scans were performed, and the registration results were recorded before and after the treatment. Then Bland–Altman method was used to analyze the consistency of AlignRT-guided positioning errors and CBCT scanning results in the OM group. The error changes between 31 fractions in one patient were recorded to evaluate the feasibility of monitoring during treatment.
Results
The median of translation error between stages of the AlignRT positioning process was (0.03–0.07) cm, and the median of rotation error was (0.20–0.40)°, which were significantly better than those of the Fraxion positioning process (0.09–0.11) cm and (0.60–0.75)°. The mean bias values between the AlignRT guided positioning errors and CBCT were 0.01 cm, − 0.07 cm, 0.03 cm, − 0.30°, − 0.08° and 0.00°. The 31 inter-fractional errors of a single patient monitored by SGRT were within 0.10 cm and 0.50°.
Conclusions
The application of the SGRT with an innovative open-face mask and mouth bite device could achieve precision positioning accuracy and stability, and the accuracy of the AlignRT system exhibits excellent constancy with the CBCT gold standard. The non-coplanar radiation field monitoring can provide reliable support for motion management in fractional treatment.
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Data availability
The data that supports the findings of this study are available from the corresponding author, upon reasonable request.
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (82272832).
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XMC and LL: contributed equally to this work. XBJ and JDL: designed and supervised the study. XBJ: conducted the innovation of the immobilization flow. XMC and LL: analyzed the data and wrote the manuscript. YJW, XTH, WXC, XDR and LWL: performed radiotherapy treatment and collected the clinical data.
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Chen, X., Liu, L., Wang, Y. et al. Surface guided radiation therapy with an innovative open-face mask and mouth bite: patient motion management in brain stereotactic radiotherapy. Clin Transl Oncol 26, 424–433 (2024). https://doi.org/10.1007/s12094-023-03260-z
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DOI: https://doi.org/10.1007/s12094-023-03260-z