立体角微分扫描成像空间响应模拟研究

The Simulation of Space Response for Scan Imaging by Fractionizing Spatial Angle

针对高能γ射线成像效率较低的问题,提出了一种利用多孔准直器配合大体积闪烁体的立体角微分扫描成像技术。详细模拟计算了准直孔的尺寸和形状等因素对于成像的空间响应特性,并可通过调整准直器的参数来满足不同的角度分辨率和成像效率的需求。在此基础上进一步提出了采用多准直孔按照一定的方式进行排布,不仅提高了效率,还可获得每个像素在全空间内具有一致的空间响应,结合位置灵敏光放大器可给出放射性分布的图像。

Aiming at the low efficiency of high-energy gamma ray imaging,a scanning imaging technique by fractionizing spatial angle with a multi hole collimator and a large volume scintillator is proposed.The spatial response characteristics of collimating hole size and shape for imaging are simulated in detail,and the collimator parameters can be adjusted to the requirements of different angular resolution and imaging efficiency.On this basis,it is further proposed to arrange the multi collimating holes in a certain way,which not only improves the efficiency,but also can obtain the consistent spatial response of each pixel in the whole space.Combined with the position sensitive optical amplifier,we can give the image of radioactive distribution.