Development of a fully automated magnetic field measurement and shimming platform for small cyclotrons
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摘要: 针对核医学诊疗对PET医用放射性核素的需求，中国原子能科学研究院正在开展PET医用小型回旋加速器的产业化研究。磁场测量和垫补是回旋加速器生产中的必经环节，小型回旋加速器结构紧凑实现磁场测量仪的全自动化控制是一个难点，解决常规垫补方法加工成本高和周期长的问题是产业化生产的关键。本文详细介绍小型回旋加速器全自动化磁场测量和精密垫补平台的研制，通过多台小型回旋加速器的磁场测量和垫补实践，发展一套快速磁场测量和垫补流程，实现全自动化测量方法缩短磁场测量周期，采用精密垫补算法减少垫补次数。在保证磁场测量和垫补工作高效高质量完成的条件下，极大降低了时间和加工成本，为小型回旋加速器的产业化生产打下基础。目前，中国原子能科学研究院已经完成多台小型回旋加速器的商业化落地。Abstract: In response to the demand for PET medical radionuclides in nuclear medicine diagnosis and treatment, China Institute of Atomic Energy is conducting research on the industrialization of PET medical small cyclotrons. Magnetic field measurement and shimming is the key point in the production of cyclotrons. The compact structure of small cyclotron is a difficulty to realize the full automatic control of magnetic field measuring instrument and solving the problems of high processing cost and long cycle of conventional shimming method is the key to industrialized production. This article will introduce in detail the development of a fully automated magnetic field measurement and precision shimming platform for small cyclotrons. Through the magnetic field measurement and shimming practice of multiple small cyclotrons, a set of rapid magnetic field measurement and shimming procedures will be developed to realize fully automatic measurement method to shorten the magnetic field measurement cycle and reduce the time of shimming by precision shimming algorithm. Under the condition of ensuring high efficiency and high quality of magnetic field measurement and shimming, the time and the processing cost are greatly reduced, which lays a foundation for the industrialized production of small cyclotrons. At present, the China Institute of Atomic Energy has completed the commercialization of several small cyclotrons.
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Key words:
- small cyclotron /
- compact /
- fully automatic /
- magnetic field measurement /
- precision shimming
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图 2 磁场测量和垫补工艺流程图
Figure 2. Flow chart of magnetic field measurement and shimming process
图 3 磁场测量径向定位方法示意图
Figure 3. Schematic diagram of radial positioning method for magnetic field measurement
图 4 全自动化磁场测量装置示意图
Figure 4. Schematic diagram of fully automated magnetic field measuring device
图 7 奇偶三角形垫补算法形状函数
Figure 7. Shape function of odd and even triangle shimming algorithm
图 10 14 MeV小回旋最终磁场测量垫补结果
Figure 10. Results of 14 MeV small cyclotron final magnetic field measurement shimming
表 1 14 MeV回旋加速器物理设计参数
Table 1. Physical design parameters of 14 MeV cyclotron
energy/MeV current/µA radius/mm pole angle/（°） hamonic number frequency/MHz gain/MeV 14 400 500 52 4 73.02 0.16 
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表 2 磁场测量误差要求
Table 2. Magnetic field measurement error requirement
random
errorfield measuring
error/Tradial measuring
error/mmradial positioning
error/mmangle measuring
error/sangle positioning
error/s2×10−4 0.1 0.1 12 20 system
errormeasuring arm
horizontal error/mmmeasuring arm
axial error/mmprobe horizontal
position error/mmprobe tilt
error/( ͦ )center shaft
tilt error/( ͦ )0.1 0.2 4 2 0.2
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