Program Information
Evaluation of the New RGSC Gating System for Motion Management
C Shi*, X Tang , M Chan , Memorial Sloan-Kettering Cancer Center, Basking Ridge, NJ
Presentations
MO-RPM-GePD-J(B)-3 (Monday, July 31, 2017) 3:45 PM - 4:15 PM Room: Joint Imaging-Therapy ePoster Lounge - B
Purpose: A new gating equipment system, Respiratory Gating for Scanners (RGSC), has been recently released and installed at our clinic. The system is relatively new, and no quality assurance (QA) procedure has been published. We herein propose our developed QA procedures for the RGSC system.
Methods: Following the recommendations of the AAPM TG 147 and other relevant literature, a dynamic respiratory motion phantom and routine QA equipment (such as solid water, ruler, etc.) were used for the tests. Fifty previously recorded breathing curves were imported into a dynamic respiratory motion phantom, which controlled the motion of the infra markers to simulate the real patient breathing. The following tasks have been performed: QA of integration of RGSC with peripheral equipment, QA of spatial reproducibility, dynamic localization accuracy for regular breathing, and dynamic localization accuracy for irregular patient-specific breathing pattern. The breathing traces obtained from the Real-time Position Management (RPM) and RGSC systems using the dynamic phantom were also compared. An in-house Matlab program, which was developed for the data analysis, derived the recorded period information.
Results: The new system passed all the QA tests. For regular breathing simulation, the system performed as well as expected and it can capture regular gating period 3-10 s. However, for irregular breathing simulation, the RGSC system showed different behavior than that of the RPM system in capturing the breathing pattern (spatial accuracy) and phase period.
Conclusion: We fully commissioned the RGSC system integration with peripheral equipment on its spatial reproducibility, dynamic localization accuracy for regular breathing and irregular breathing patterns. The results show that the new functions and position accuracy improve the RGSC system’s ability for dynamic treatment accuracy. A set of acceptance tests and QA procedures were proposed for the new gating system.
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