ArticleJournal of applied clinical medical physics2023
Comparison of baseline drifts using three reflector blocks versus using a single reflector block for the calibration of wall-mounted Respiratory Gating for Scanner (RGSC) camera integrated with a CT.
Article in Journal of applied clinical medical physics, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
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Who cites it
6 citing papers in PubMed.
- A novel respiratory surrogate system with table motion correction and visual feedback for computed tomography.Physics and imaging in radiation oncology · 2025Article
- A self-gated 4D-MRI sequence for internal target volume delineation in liver: Phantom and pre-clinical validation.Journal of applied clinical medical physics · 2025Article
- Investigating the effects of table movement and sag on optical surrogate-driven respiratory-guided computed tomography.Journal of applied clinical medical physics · 2025Article
- Enhanced calibration method for wall-mounted RGSC cameras: Mitigating baseline drift caused by CT couch sagging.PloS one · 2025Article
- Resolving signal drift in the wall-mounted camera of the RGSC system.Journal of applied clinical medical physics · 2024Article
- Comparison of baseline drifts using three reflector blocks versus using a single reflector block for the calibration of wall-mounted Respiratory Gating for Scanner (RGSC) camera integrated with a CT.Journal of applied clinical medical physics · 2023Article
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9 authors.
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Abstract
backgroundThe calibration of the Respiratory Gating for SCanner (RGSC) system is critical to achieve better and more stable accuracy. The current procedure for a wall-mounted RGSC system has a relatively large residual error. PURPOSE: To compare the baseline drifts in the image acquisition of DIBH using three reflector blocks versus using a single reflector block in the calibration of a wall-mounted RGSC camera system. MATERIALS AND
methodsVarian provides a calibration plate with three rows of calibration points: each row is separated by 15 cm longitudinally and by 10 cm laterally. In Varian's single-block calibration method, the reflector block was first placed on the center point of the calibration plate and aligned with the scanner isocenter. The calibration took a picture of the block, then placed the block on the other eight points sequentially. In the proposed three-block method, we placed three reflector blocks on the center row, with the center block aligned with the isocenter, and we took a picture of the center block by manually blocking the other two blocks in calibration. By moving the couch longitudinally in or out 15 cm, the calibration goes through all nine points. Monte Carlo simulation was done using Matlab to analyze the calibration matrix eigenvalue characteristics.
resultsFor a typical scan length of 40 cm of DIBH, the residual baseline drift in simulated DIBH is 0.02 ± 0.03 versus 0.30 ± 0.12 cm for three-block calibration and single-block calibration, respectively. To achieve 0.5 mm tolerance for the eigenvalue, the laser and reflector box should be within ±3 mm uncertainties based on the eigenvalue simulation.
conclusionThree-block calibration method effectively removes baseline drift caused by couch movement in DIBH/4D CT scan for the wall-mounted camera while the single-block calibration method still has significant residual baseline drift.
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