A CW FFAG FOR PROTON COMPUTED TOMOGRAPHY
A CW FFAG FOR PROTON COMPUTED TOMOGRAPHY
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用于质子计算机断层扫描的 CW FFAG
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
P. Snopok
中科院分区：
文献类型：
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作者：
C. Johnstone;P. Snopok
回旋加速器在质子治疗中的优点是连续（CW）射束输出，其降低了剂量测定要求和射束控制的复杂性和响应时间。CW加速器需要在整个加速循环中的所有能量下的等离子体粒子轨道，并且目前用于质子治疗的紧凑型等离子体回旋加速器仅达到患者治疗所需的250 MeV（动能），但是对于全质子计算机断层扫描（pCT）能力来说较低。PCT规范需要300-330 MeV才能让质子通过人体。最近的创新，在无标度FFAG设计实现了等熵性能在一个紧凑的设计（~3米半径），在这些更高的能量。这里给出了初步的等值线设计。可以有效地提取较低能量射束用于患者治疗，而不改变加速周期和磁体电流。
An advantage of the cyclotron in proton therapy is the continuous (CW) beam output which reduces complexity and response time in the dosimetry requirements and beam controls. A CW accelerator requires isochronous particle orbits at all energies through the acceleration cycle and present compact isochronous cyclotrons for proton therapy reach only 250 MeV (kinetic energy) which is required for patient treatment, but low for full Proton Computed Tomography (pCT) capability. PCT specifications need 300-330 MeV in order for protons to transit the human body. Recent innovations in nonscaling FFAG design have achieved isochronous performance in a compact (~3 m radius) design at these higher energies. Preliminary isochronous designs are presented here. Lower energy beams can be efficiently extracted for patient treatment without changes to the acceleration cycle and magnet currents.