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RISS 인기검색어
- 검색키워드
- 저자 : Ding Kaizhong (검색결과 2 건)
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Real-time motion management for robotic treatment couch in proton therapy system
Wei Jianghua,Song Yuntao,Ding Kaizhong,Chen Yonghua,Guo Zhoushun,Yuan Hui 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.82 No.2
In proton therapy, robotic couch was used for patient positioning to achieve high precision in cancer treatment. However, no studies have focused on the real-time motion management system (MMS) for the robotic couch. This study was to develop the MMS and verify its feasibility. A real-time MMS was set up with a robotic couch, an NDI Vega optical tracking system, a Special Measurement Tool (SMT) and the developed software. A Leica laser tracker was adopted to verify the accuracy of the tests in this study. The stability and accuracy of the SMT in NDI Vega system were verifed to guarantee the reliability of the results. The coordinate transformation was used to unify the measurement. 83 points inside the treatment volume were applied to verify the accuracy of the MMS, with the comparison of results measured by the laser tracker. The synchronism of the SMT in the MMS and Patient Positioning System (PPS) based on the reciprocating motion along axis z was tested to obtain the maximum time delay. Trajectory tracking was performed with diferent payloads on the couch top. A series of tests were conducted and the results demonstrated the feasibility of potential applications based on real-time motion capturing and monitoring.
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Design and performance of the digital LLRF control system for isotope production cyclotron
Chao Chujie,Chen Gen,Mao Yuzhou,Chen Yonghua,Ding Kaizhong,Zhang Xin 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.82 No.2
The project of a 14 MeV cyclotron used for isotope production was developed by ASIPP (Hefei, China). To generate stable radionuclides by the cyclotron, the beam parameters should be stabilized rigorously. Therefore, a digital low-level RF system (LLRF) was designed and built to stabilize acceleration voltage and control the resonance of the cyclotron. The system can be confgured to use Non-IQ sampling techniques, resulting in a high performance RF control without the need of very high speed acquisition hardware. In this paper, the functional requirements of LLRF systems are analyzed, including the two feedback control loops, contain tuning loop, the amplitude loop, and the automatic conditioning process. Meanwhile, the hardware design of the FPGA-based core processing board is presented. In experiments, the automatic conditioning process was tested, which certifes the process can greatly shorten the conditioning time. The stability of the cavity voltage and control efect for the resonant frequency has also been measured, and the results show that the amplitude stability is better than 0.0092% under beam loading operation. Experimental results in diferent operating modes prove that the digital LLRF system can meet the demands of RF control systems for isotope production cyclotron.
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