轴向视场为300 mm的24模块J-PET样机的同步和标定
Synchronisation and calibration of the 24-modules J-PET prototype with 300~mm axial field of view
摘要：
在J-PET项目框架内进行的研究旨在开发具有成本效益的全身正电子发射断层成像扫描仪。作为从长条塑料切片构建全尺寸J-PET断层扫描仪的第一步，构建并测试了24条原型。该原型由轴向排列的检测模块组成，形成内径为360 mm的圆柱形诊断室，轴向视场为300 mm。由于塑料衰减器条的轴向排列，打开了用于全身PET扫描仪的低成本构造的前景，其具有小的光衰减，优越的定时特性，以及轴向视场的成本有效增加的可能性。所提出的原型包括专用的完全数字前端电子电路和无源数据采集系统，这需要开发新的校准方法，包括时间，阈值和增益同步。该系统和详细的校准方法，包括24模块的J-PET原型的第一个结果，并进行了讨论。所获得的符合分辨时间等于CRT = 490 $\pm$ 9 ps。该值可以转换为位置重建精度$σ(Δl) =$ 18 mm，其与位置无关。
英文摘要：
Research conducted in the framework of the J-PET project aims to develop a cost-effective total-body positron emission tomography scanner. As a first step on the way to construct a full-scale J-PET tomograph from long strips of plastic scintillators, a 24-strip prototype was built and tested. The prototype consists of detection modules arranged axially forming a cylindrical diagnostic chamber with the inner diameter of 360 mm and the axial field-of-view of 300 mm. Promising perspectives for a low-cost construction of a total-body PET scanner are opened due to an axial arrangement of strips of plastic scintillators, wchich have a small light attenuation, superior timing properties, and the possibility of cost-effective increase of the axial field-of-view. The presented prototype comprises dedicated solely digital front-end electronic circuits and a triggerless data acquisition system which required development of new calibration methods including time, thresholds and gain synchronization. The system and elaborated calibration methods including first results of the 24-module J-PET prototype are presented and discussed. The achieved coincidence resolving time equals to CRT = 490 $\pm$ 9 ps. This value can be translated to the position reconstruction accuracy $σ(Δl) =$ 18 mm which is fairly position-independent.
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