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Comparing Setup Errors of CBCT Guidance System and Optical Positioning System Using Phantom Experiments

Han Zhou1, Jie Zhang1, Yun Ge1 , Ying Chen1, and Kelvin Kian Loong Wong2
1.School of Electronic Science and Engineering, Nanjing University, China, XianLin Road, JiangSu province, 210046
2.Engineering Computational Biology, School of Computer Science and Software Engineering The University of Western Australia, 35 Stirling Highway, Crawley, WA 6000
Abstract—Objective: To compare the clinical positioning error of patient setup between the cone beams computed tomography (CBCT) guidance with Optical Positioning System (OPS), and to evaluate the OPS based on our proposed approach of patient positioning. Materials and Methods: A phantom was used. We measured setup errors in left-to-right (LR) and anterior-to-posterior (AP) directions by vernier caliper on a graph paper on Varian Linear accelerator, and then we shifted the couch height to make the source-to-surface distance (SSD)=100cm and recorded the height change which was displayed on monitor screen as the setup error in inferior-to-superior (IS) direction. Results: Average(Avg) setup errors for the CBCT guidance system were 0.42mm, 0.50mm,and0.66mm in LR, IS and AP directions, respectively; the SD of it were 0.24mm, 0.00mm and 0.52mm in LR, IS and AP directions, respectively. The OPS has an Avg setup error of 0.28mm, 0.40mm and 0.30mm in LR, IS and AP directions and SD of 0.08mm, 0.10mm and 0.07mm in LR, IS and AP directions, respectively. Conclusion: We demonstrated that OPS shows a comparable, fast and efficient positioning method compared to CBCT guidance system, and lives up to the actual need and will have a wide use in clinical application.

Index Terms—radiotherapy, CBCT guidance system, optical positioning system.

Cite: Han Zhou, Jie Zhang, Yun Ge, Ying Chen, and Kelvin Kian Loong Wong, "Comparing Setup Errors of CBCT Guidance System and Optical Positioning System Using Phantom Experiments," Journal of Medical and Bioengineering, Vol. 4, No. 6, pp. 484-487, December 2015. Doi: 10.12720/jomb.4.6.484-487
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