Clinical technique: evaluation of detection accuracy in surface-guided radiation therapy using CT references from different treatment planning systems.

This study evaluated the detection accuracy of the VOXELAN surface-guided radiation therapy (SGRT) system using CT reference body surfaces generated by different radiation treatment planning systems (RTPSs) under their respective default CT value threshold settings. Two phantoms were used to assess 6-axis position matching accuracy with 1 mm and 2 mm slice thicknesses. Contour variations of approximately 2 mm were observed in the ventral and dorsal directions due to differing RTPSs. VOXELAN generally achieved detection accuracy within 1 mm, though some RTPS combinations showed errors exceeding 1 mm in the longitudinal and lateral directions. Slice thickness differences had minimal impact on detection accuracy. Overall, VOXELAN's detection accuracy varied slightly depending on the RTPS used but remained within approximately 1 mm. From our results, using a consistent RTPS when performing SGRT is recommended, as detection errors associated with different RTPS combinations were complex and difficult to interpret.