AI Article Synopsis

  • - The study introduces a new calibration method to address signal drift in Respiratory Gating for Scanner systems, specifically when using a wall-mounted camera and dealing with table sagging.
  • - The calibration involved simulating a patient's weight using solid water phantoms and measuring at various points around the CT isocenter in two hospitals.
  • - Results showed that the new method significantly reduced signal drift during scans, enhancing accuracy in radiation delivery for patients, particularly those with higher body weight.

Article Abstract

Purpose: To present a modified calibration method to reduce signal drift due to table sagging in Respiratory Gating for Scanner (RGSC) systems with a wall-mounted 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 calibration method 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 wall-mounted camera RGSC systems, especially in conjunction with a bariatric CT couchtop.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10929989PMC
http://dx.doi.org/10.1002/acm2.14291DOI Listing

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