Purpose: Evaluate the fiducial marker-based position verification in the external-beam radiotherapy of patients with cranial tumour. Methods: Thirteen patients with intracranial tumours were treated with external-beam radiotherapy using 3 gold markers implanted in the skull. Before each fraction the patient was positioned on the treatment table and 2 orthogonal portal images were performed to localise the 3 gold seeds and the target position was calculated using a commercialised computer program (ISOLOC software, MEDTEC). This program provides the couch movements required to move the target to the isocentre. Results: When the set-up error was corrected using the coordinates of the 3 markers, the final movements were less than 2 mm in all cases: lateral, mean v., 1.21 mm; longitudinal, 1.23 mm; and anteroposterior, 1.18 mm. No serious complications related to the gold marker insertion were noted. Conclusion: The use of 3 implanted fiducial seeds is an optimal technique for precise set-up in patients with brain tumours treated with external radiotherapy. This commercial system is highly suitable for fractionated stereotactic irradiation. © Feseo 2007.
CITATION STYLE
Cañón, R. M., Azinovic, I., Lobato, M., Navarro, J., & Rebollo, J. (2007). Analysis of fiducial markers used for on-line verification in the external-beam radiotherapy of patients with cranial tumours. Clinical and Translational Oncology, 9(8), 531–536. https://doi.org/10.1007/s12094-007-0097-1
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