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| Main Authors: | , , , |
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| Format: | Preprint |
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2026
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| Online Access: | https://arxiv.org/abs/2604.00589 |
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| _version_ | 1866915905199407104 |
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| author | Looe, Hui Khee Bartner, Niklas Felix Hendrik Poppe, Björn Willborn, Kay C. |
| author_facet | Looe, Hui Khee Bartner, Niklas Felix Hendrik Poppe, Björn Willborn, Kay C. |
| contents | Surface-guided radiation therapy (SGRT) is now widely used for radiation-dose-free, marker-free patient positioning in modern radiotherapy. We commissioned and clinically implemented a novel SGRT system, LUNA 3D (LAP, Lueneburg, Germany), featuring browser-based operation, GPU-accelerated surface reconstruction, frame rates above 12 Hz, a large field of view, and virtual laser projection. Commissioning included tests of temperature drift, reproducibility, translational and rotational shift accuracy, gantry-related camera occlusion, agreement with cone-beam CT (CBCT), and end-to-end dosimetric performance. Results were evaluated using both an SGRT-acquired reference surface and a CT-derived external surface. Temperature drift remained below 0.4 mm on all axes. With the SGRT reference, maximum deviations were at most 0.3 mm translationally and 0.2 degrees rotationally; with the CT-derived reference, translational deviations increased to 0.8 mm, consistent with systematic bias from the reference surface. Agreement between LUNA 3D and CBCT was within 1.0 mm, and end-to-end testing showed CBCT residuals of 0.9-1.3 mm with 1.2% dosimetric deviation. All results satisfied ESTRO-ACROP guideline criteria. Clinical evaluation of 192 breast and 259 pelvic treatment datasets showed significant improvements after implementation: the breast 3D translational vector decreased by 28.7% from 7.00 +/- 4.35 mm to 4.99 +/- 2.75 mm, and the pelvic 3D rotational vector decreased by 24.0% from 2.31 +/- 0.96 degrees to 1.76 +/- 0.67 degrees (both p < 0.001). These results establish LUNA 3D as a reliable SGRT system that improves routine patient positioning accuracy. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_00589 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Commissioning and clinical outcome assessment of a novel surface-guided radiation therapy (SGRT) system at a C-Arm linear accelerator Looe, Hui Khee Bartner, Niklas Felix Hendrik Poppe, Björn Willborn, Kay C. Medical Physics Surface-guided radiation therapy (SGRT) is now widely used for radiation-dose-free, marker-free patient positioning in modern radiotherapy. We commissioned and clinically implemented a novel SGRT system, LUNA 3D (LAP, Lueneburg, Germany), featuring browser-based operation, GPU-accelerated surface reconstruction, frame rates above 12 Hz, a large field of view, and virtual laser projection. Commissioning included tests of temperature drift, reproducibility, translational and rotational shift accuracy, gantry-related camera occlusion, agreement with cone-beam CT (CBCT), and end-to-end dosimetric performance. Results were evaluated using both an SGRT-acquired reference surface and a CT-derived external surface. Temperature drift remained below 0.4 mm on all axes. With the SGRT reference, maximum deviations were at most 0.3 mm translationally and 0.2 degrees rotationally; with the CT-derived reference, translational deviations increased to 0.8 mm, consistent with systematic bias from the reference surface. Agreement between LUNA 3D and CBCT was within 1.0 mm, and end-to-end testing showed CBCT residuals of 0.9-1.3 mm with 1.2% dosimetric deviation. All results satisfied ESTRO-ACROP guideline criteria. Clinical evaluation of 192 breast and 259 pelvic treatment datasets showed significant improvements after implementation: the breast 3D translational vector decreased by 28.7% from 7.00 +/- 4.35 mm to 4.99 +/- 2.75 mm, and the pelvic 3D rotational vector decreased by 24.0% from 2.31 +/- 0.96 degrees to 1.76 +/- 0.67 degrees (both p < 0.001). These results establish LUNA 3D as a reliable SGRT system that improves routine patient positioning accuracy. |
| title | Commissioning and clinical outcome assessment of a novel surface-guided radiation therapy (SGRT) system at a C-Arm linear accelerator |
| topic | Medical Physics |
| url | https://arxiv.org/abs/2604.00589 |