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Purpose: To present a modified calibration method to reduce signal drift due to table sagging in Respiratory Gating for Scanner (RGSC) systems with a wallmounted camera. Materials and Methods: Approximately 70 kg of solid water phantoms were evenly distributed on the CT couch, mimicking the patient's weight. New calibration measurements were performed at 9 points at the combination of three lateral positions, the CT isocenter and ±10 cm laterally from the isocenter, and three longitudinal locations, the CT isocenter and ±30 cm or ±40 cm from the isocenter. The new calibration was tested in two hospitals. Results: Implementing the new weighed calibrationmethod at the extended distance yielded improved results during the DIBH scan, reducing the drift to within 1 from 3 mm. The extended calibration positions exhibited similarly reduced drift in both hospitals, reinforcing the method's robustness and its potential applicability across all centers. Conclusion: This proposed solution aims to minimize the systematic error in radiation delivery for patients undergoing motion management with wallmounted camera RGSC systems, especially in conjunction with a bariatric CT couchtop. [ABSTRACT FROM AUTHOR]