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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

提出并测试了一种利用双光电倍增管（PMT）实现的一维共享块检测器。探测器由闪烁体块和双光电倍增管组成。双PMT光学耦合在闪烁体块上并且在一维上重叠。利用这种配置，块检测器的闪烁体尺寸可以在一个方向上减小到传统块检测器的闪烁体尺寸的一半，并且可以使用市售的双PMT在横轴和轴向方向上获得各向同性的空间分辨率。首先，我们测量了最小配置的位置和能量响应;一个GSO块和两个双PMT。单颗GSO的尺寸为2.9mm × 2.9mm ×20 mm，双光子晶体按8×8矩阵排列，双光子晶体之间插入多层光学薄膜，以获得可分辨的位置响应。我们获得了良好的位置和能量响应与此配置。接下来，我们制作了一个具有五个GSO块和六个双PM的一维共享块检测器 ...更多信息 Ts.利用这种结构，我们也得到了合理的位置和能量响应。这些结果表明，本文提出的一维共享块探测器是开发高分辨率、低成本PET系统的一个很有前途的解决方案。成像系统由四组一维共享块探测器和单个伽马探头组成，并测量这两个探测器之间的重合。一维共享检测器使用5个GSO模块，光学耦合到6个双光电倍增管（PMT）。单个GSO的尺寸为2.9mm× 2.9mm × 15 mm。来自四个一维共享检测器的信号被馈送到加权求和电路。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。测量了该伽马成像探测器和手持式单伽马探头之间的重合度。将采集的数据传输到个人计算机并显示。在位置直方图中分辨出对应于GSO的大多数点。当探测器之间的距离较大时，空间分辨率约为3 mm，当单个探头距离成像仪表面25 mm时，灵敏度为0.1-0.2%。成功获得了幻影的图像。该符合成像系统具有视场大、操作方便、空间分辨率合理等优点，有望成为一种新型的核医学仪器。少