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

一维共享探测器的研制及其在成像系统中的应用

基本信息

批准号：
15390365
负责人：
YAMAMOTO Seiichi
金额：
$ 9.22万
依托单位：
Kobe City College of Technolog
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

项目摘要

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

我们提出并使用双光型管（PMT）来测试1个区块检测器（PMT）。可以使用Commermercial可用的双PMT在跨轴和轴向方向上获得分辨率离子的块检测器。在8×8 Matri X中使用多层光膜插入闪烁体之间的部分，以通过此配置获得良好的位置和能量响应。这些结果表明，1-D共享块检测器是开发和低成本的宠物宠物的有前途的解决方案这些探测器和单个伽马探头和这些检测器的探测器。 x 2.9毫米x 15mm。一维共享检测器的信号由100 MHz的数字（A-D）转换器进行了加权电路。显示的3mm探测器之间的距离很大，灵敏度为0.1-0.2％，我们得出结论，开发的一致成像系统具有较大的FOV，易于处理，并且有可能成为核药物的新仪器。较少的