Geometric accuracy in patient positioning for stereotactic radiotherapy of intracranial tumors

This study determines and compares the geometric setup errors between stereoscopic x-ray and kilo-voltage cone beam CT (CBCT) in phantom tests on a linear accelerator (linac) for image-guided (IG) stereotactic radiotherapy of intracranial tumors. Additionally, dose-volume metrics in the target volum...

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Bibliographic Details
Published in:Physics and imaging in radiation oncology 2023-07, Vol.27, p.100461-100461, Article 100461
Main Authors: Bolten, Jan-Hendrik, Dunst, Jürgen, Siebert, Frank-André
Format: Article
Language:English
Subjects:
Accuracy in patient positioning
CBCT
ExacTrac
Image-guided radiotherapy
Intracranial tumors
Original
Stereotactic Radiotherapy
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Summary:This study determines and compares the geometric setup errors between stereoscopic x-ray and kilo-voltage cone beam CT (CBCT) in phantom tests on a linear accelerator (linac) for image-guided (IG) stereotactic radiotherapy of intracranial tumors. Additionally, dose-volume metrics in the target volumes of the setup errors of CBCT were evaluated. A Winston-Lutz- and an anthropomorphic phantom were used. The mean deviation and root mean square error (RMSE) of CBCT and stereoscopic x-ray were compared. Dose-volume metrics of the planning target volume (PTV) and gross target volume (GTV) for CBCT were calculated. The RMSEs in the tests with the Winston-Lutz-Phantom were 0.3 mm, 1.1 mm and 0.3 mm for CBCT and 0.1 mm, 0,1 mm and 
ISSN:2405-6316
2405-6316
DOI:10.1016/j.phro.2023.100461