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Successful Commission of the Rotating Gantry for China's First Superconducting Proton Therapy System

2018-11-23 01:35:29

Significant progress achieved in the superconducting rotating proton therapy systemt at Hefei National Comprehensive Science Center on November 22. The core component, the 360° rotating gantry, has successfully completed its engineering debugging, with key parameter indicators fully meeting treatment requirements.

 

Fig.1:Integrated Assembly Diagram of the Rotating Gantry

After multiple rounds of technical challenges, HFCIM has successfully addressed key technical issues such as the high-precision and high-stability drive system for large rotating devices and ensuring deformation is less than 1mm under large-span support. By adopting a drive system with a large ring gear and dual active gears, the test results show that the rotating gantry can achieve a positioning accuracy of 0.1° within the 360° range, ensuring smooth and reliable operation. The center point accuracy reaches 0.8mm (±0.4mm), and the emergency stop angle at the highest speed of 1rpm (6°/s) is 2.85°, surpassing the requirements of the international IEC60601-2-64:2014 standard and the guidelines for proton and carbon ion review (emergency stop angle should be less than 3° when exceeding 1°/s). The successful commissioning of the domestically innovated and developed first 360° rotating gantry lays a solid technical foundation for accelerating the localization and industrialization of proton therapy in China.


Fig. 2: Test Results for Emergency Stop Angle at Maximum Speed of 1rpm (6°/s), Angle 2.85°

At present, the R&D of other key components of the system is progressing in an orderly manner. After multiple rounds of testing, the cyclotron has achieved a series of key technical indicators. The superconducting magnet is excited to 140A, successfully achieving a central magnetic field of 2.8T. The maximum input power of the high-frequency cavity reaches 80kW, meeting the design specifications. The beam has been successfully extracted from the ion source, laying the foundation for  beam commission.


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