Fast Data Acquisition in Heavy Ion CT Using Intensifying Screen-EMCCD Camera System

利用x射线增强屏电荷耦合器件（CCD）相机系统研究了重离子CT（IonCT）技术中快速数据采集的可行性。我们采用了高品质的电子倍增CCD（EMCCD）相机，大大缩短了数据采集时间。我们还利用物体上游的平行板电离室监测来自同步加速器的重离子束强度的时间变化，并对所有EMCCD图像进行光束强度校正。我们证明了一个由6个杆组成的电子密度幻影在10分钟内成功地重建了256个投影，相对电子密度分辨率为1%。

We investigated the feasibility of fast data acquisition in heavy ion CT(IonCT) technique with an X-ray intensifying screen-charged coupled device(CCD) camera system. Weuseda high quality Electron Multiplying CCD(EMCCD) camera, which drastically reduced data acquisition time. We also useda parallel-plate ionization chamber upstream of anobject to monitor the time variation inheavy ion beam intensity from a synchrotronaccelerator and to perform beam intensity correction for all EMCCD images. We demonstrated that an electron density phantom consisting of six rods was successfully reconstructed in only 10min for 256 projections with a relative electron density resolution of 1%.