Abstract
A calibration phantom made of Derlin requires manual translational and rotational adjustments when calibrating a light-section-based optical surface monitoring system (VOXELAN) with a phantom material that insufficiently reflects the red-slit laser of the system. This study aimed to develop a new calibration phantom using different materials and to propose a procedure that minimizes setup errors. The new phantom, primarily made of PET100, which exhibits good reflectivity without scattering or attenuating the red-slit laser at the phantom surface, was shaped in a manner similar to that of previous designs. The detection accuracy and stability were evaluated using six different regions of interest (ROIs) and compared with previous phantom designs. The coordinate coincidence between the machine and VOXELAN was compared for both phantom designs. The detection accuracy and stability of the new phantom in the reference ROI setting were found to be better than those of previous phantoms. In the lateral, longitudinal, and vertical directions, the coordinate coincidences in translational directions for the previous phantom were obtained at 1.07 ± 0.66, 1.46 ± 0.47, and 0.26 ± 0.83 mm, whereas those for the new phantom were obtained at 0.28 ± 0.21, 0.18 ± 0.30, and − 0.30 ± 0.29 mm, respectively. The rotational errors of the two phantoms were identical. The new phantom exhibited improved detection stability because of its good reflectivity. Additionally, the new placement procedure was linked to the six-degrees-of-freedom couch. A combination of the new phantom and its new placement procedure is suitable for coordinate calibration of VOXELAN.
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Data availability
Raw data were generated at the Seirei Hamamatsu General Hospital. Data supporting the findings of this study are available from the corresponding author upon request.
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Acknowledgements
The authors thank Hiroshige Murakami (ERD Corporation) and Yuki Hamano (Hamano Engineering Corporation) for technical support with VOXELAN.
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This work was supported in part by a Grant-in-Aid for Scientific Research (Grant number 22K12852).
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All authors contributed to the conception and design of this study. Material preparation, data collection, and analysis were performed by Tatsunori Saito and Naoki Hayashi. The first draft of the manuscript was written by Naoki Hayashi and polished by all authors. All authors have read and approved the final manuscript prior to submission.
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Saito, T., Hayashi, N., Amma, H. et al. Development of a new coordinate calibration phantom for a light-section-based optical surface monitoring system. Radiol Phys Technol 16, 366–372 (2023). https://doi.org/10.1007/s12194-023-00726-1
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DOI: https://doi.org/10.1007/s12194-023-00726-1