ArticleReports of practical oncology and radiotherapy : journal of Greatpoland Cancer Center in Poznan and Polish Society of Radiation Oncology2025
Significance of positional correction of planned couch angles with the ExacTrac system.
Article in Reports of practical oncology and radiotherapy : journal of Greatpoland Cancer Center in Poznan and Polish Society of Radiation Oncology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
This study evaluated the benefits of the ExacTrac system for non-coplanar beams in brain stereotactic radiotherapy (SRT) by comparing pre- and post-X-ray verification (XV) positioning data. Data from 62 patients undergoing brain SRT were analyzed, focusing on 151 non-coplanar beams. Patient positioning involved initial infrared marker alignment, followed by ExacTrac kV x-ray acquisition and 6D robotic couch adjustments. Patient positioning was corrected within a tolerance of 0.5 mm and 0.5° for translation and rotation, respectively. Pre and post-XV positioning data were compared at each planned couch angle. Results showed that 54% of non-coplanar beams had positioning errors exceeding the specified tolerances on the pre-XV. Significant differences were observed in translational and rotational corrections between pre- and post-XV positioning at each planned couch angle. These results demonstrate that XV at any each planned couch angle using the ExacTrac system significantly improves patient positioning accuracy in brain SRT.
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