Development of one-dimensional sharing detectors and application to imaging system

我们提出并测试了一种使用双光倍增管（PMT）的一维共享块探测器。探测器由闪烁体块和双pmt组成。双pmt在闪烁体块上光学耦合并在一维上重叠。利用这种结构，块探测器的闪烁体尺寸可以在一个方向上减少到传统块探测器的一半，并且可以使用市售的双pmt在跨轴和轴向上获得各向同性空间分辨率。首先，我们测量了最小构型的位置和能量响应；一个GSO块和两个双pmt。单个GSO的尺寸为2.9 mm×2.9 mm×20 mm。闪烁体排列在8×8矩阵中，在闪烁体之间部分插入多层光学薄膜以获得解析的位置响应。我们得到了良好的位置和能量响应。接下来，我们制作了一个由5个GSO块和6个双PM…More t组成的1-D共享块探测器，通过这种配置，我们也获得了合理的位置和能量响应。这些结果表明，所提出的一维共享块检测器是开发高分辨率和低成本PET系统的一个有前途的解决方案。并利用一维共享探测器研制了大视场重合成像系统。该成像系统由四组一维共享块探测器和一个单一的伽马探测器组成，并测量这两个探测器之间的一致性。一维共享探测器使用5个GSO块光学耦合到6个双光电倍增管（PMT）。单个GSO的大小为2.9mm×2.9 mm×15mm。来自四个一维共享检测器的信号被送入加权求和电路。它们由100 MHz自由运行的模数（A-D）转换器数字化，并用于计算伽马相互作用的位置。在这个伽马成像探测器和手持式单伽马探测器之间测量了一致性。采集到的数据被传送到一台个人电脑上并显示出来。大多数与gso对应的点在位置直方图中得到了解析。探测器间距较大时，空间分辨率约为3mm，单探头距成像仪表面25mm时，灵敏度为0.1-0.2%。成功地获得了幽灵的图像。本文所研制的符合成像系统视场大，操作方便，空间分辨率合理，具有成为核医学新仪器的潜力。少

We propose and test a 1-dimentional sharing block detector using dual photo-multiplier tubes (PMT). The detector consists of scintillator blocks and dual PMTs. The dual PMTs are optically coupled on the scintillator blocks and overlap in one dimensional. With this configuration, the scintillator size of the block detector can be reduced to half that of a conventional block detector in one direction, and isotropic spatial resolution can be obtained in transaxial and axial directions using commercially available dual PMTs. First, we measure the position and energy response for minimum configuration ; one GSO block and two dual PMTs. The size of a single GSO is 2.9 mm×2.9 mm×20 mm. The scintillators are arranged in an 8×8 matrix with multi-layer optical film inserted partly between scintillators to obtain the resolved position response. We obtain good position and energy responses with this configuration. Next, we fabricate a 1-D sharing block detector with five GSO blocks and six dual PM … More Ts. With this configuration, we also obtain reasonable position and energy responses. These results indicate that the proposed 1-D sharing block detector is a promising solution for developing high-resolution and low cost PET systems.Also we developed a large field of view (FOV) coincidence imaging system using the one-dimensional sharing detector. The imaging system consists of four sets of one-dimensional sharing block detectors and a single gamma probe and measures coincidence between these two detectors. The one-dimensional sharing detector uses 5 GSO blocks optically coupled to 6 dual photomultiplier tubes (PMT). The size of a single GSO is 2.9mm×2.9 mm×15mm. The signals from four one-dimensional sharing detectors are fed to weighted summing circuits. They are digitized by 100 MHz free running analog to digital (A-D) converters and are used to calculate the position of gamma interaction. Coincidence was measured between this gamma imaging detector and a hand-held single gamma probe. Acquired data was transferred to a personal computer and displayed. Most spots correspond to GSOs were resolved in the position histogram. Spatial resolution was around 3mm when the distance between detectors is large and sensitivity was 0.1-0.2% when the single probe was 25mm from the imager surface. Images of phantoms were successfully obtained. We conclude developed coincidence imaging system has large FOV and easy to handle, reasonable spatial resolution and has potential to be a new instrument for nuclear medicine. Less