10 lp/mm空间分辨率高能CT系统

High-energy CT system with 10 lp/mm spatial resolution

摘要: 报道了基于光阴极S波段电子直线加速器建成的9 MeV高能微焦点射线成像系统“精卫”，X射线束横向尺寸小于100 μm，7 h剂量波动低至1.6%。初步开展成像实验结果表明：双丝像质计清晰分辨13D号丝，丝直径0.05 mm，CT测试卡测得空间分辨率优于10 lp/mm，装置同时兼容电子束能量6～18 MeV可调。

Abstract: Based on the photocathode S-band electron linac, a high-energy (9 MeV) micro-focus CT system named “Jingwei” was built. The focal-point is less than 100 μm, and the 7 h dose fluctuation is as low as 1.6%. An initial imaging experiment was also carried out. The focal spot of the dual-wire image quality meter clearly distinguished the 13D wire with a wire diameter of 0.05 mm, and the CT spatial resolution measured by a test card is better than 10 lp/mm. The electron beam energy of the system is also adjustable from 6 MeV to 18 MeV.