Two-dimensional diced scintillator array for innovative, fine-resolution gamma camera
Two-dimensional diced scintillator array for innovative, fine-resolution gamma camera
复制标题
用于创新、高分辨率伽马相机的二维切割闪烁体阵列
DOI：
10.1016/j.nima.2014.04.060
复制
发表时间：
2014
影响因子：
1.4
通讯作者：
S. Yamamoto
中科院分区：
文献类型：
--
作者：
T. Fujita;J. Kataoka;T. Nishiyama;S. Ohsuka;S. Nakamura;S. Yamamoto
我们正在开发一种技术，通过使用硅光电倍增管 (SiPM) 和精细像素化闪烁体板来制造精细空间分辨率（FWHM < 0.5 mm）和经济高效的光子计数探测器。与使用微柱状CsI（Tl）板的传统X射线成像仪不同，我们可以对厚度超过1毫米的各种闪烁晶体板进行像素化，并轻松开发高精度的大面积、细间距闪烁体阵列。将细间距闪烁体阵列与 SiPM 阵列耦合可形成紧凑、快速响应的探测器，非常适合放射自显影、伽马相机和光子计数 CT 中使用的 X 射线、伽马射线和带电粒子检测。第一步，我们通过使用划片锯在 1.0 mm 厚的 Ce: GAGG 板上切割 50 μm 宽的微槽，制造了间距为 0.25 mm 的二维掺铈 Gd 3 Al 2 Ga 3 O 12 (Ce: GAGG) 闪烁体阵列。闪烁体板与 3.0×3.0 mm 像素 4×4 SiPM 阵列光学耦合，并通过电阻电荷分配网络读出。即使使用这个简单的系统作为伽马相机，我们也能在 122 keV 伽马射线下获得 0.48 毫米 (FWHM) 的出色空间分辨率。我们将提出进一步提高图像信噪比的计划，并讨论在不久的将来各种可能的应用。
We are developing a technique to fabricate fine spatial resolution (FWHM< 0.5 mm) and cost-effective photon counting detectors, by using silicon photomultipliers (SiPMs) coupled with a finely pixelated scintillator plate. Unlike traditional X-ray imagers that use a micro-columnar CsI (Tl) plate, we can pixelate various scintillation crystal plates more than 1 mm thick, and easily develop large-area, fine-pitch scintillator arrays with high precision. Coupling a fine pitch scintillator array with a SiPM array results in a compact, fast-response detector that is ideal for X-ray, gamma-ray, and charged particle detection as used in autoradiography, gamma cameras, and photon counting CTs. As the first step, we fabricated a 2-D, cerium-doped Gd 3 Al 2 Ga 3 O 12 (Ce: GAGG) scintillator array of 0.25 mm pitch, by using a dicing saw to cut micro-grooves 50 μ m wide into a 1.0 mm thick Ce: GAGG plate. The scintillator plate is optically coupled with a 3.0× 3.0 mm pixel 4× 4 SiPM array and read-out via the resistive charge-division network. Even when using this simple system as a gamma camera, we obtained excellent spatial resolution of 0.48 mm (FWHM) for 122 keV gamma-rays. We will present our plans to further improve the signal-to-noise ratio in the image, and also discuss a variety of possible applications in the near future.
电子倍增和内部 X 射线荧光对闪烁体伽马相机性能的影响
DOI：
10.1016/j.nima.2012.03.013
发表时间：
2012
期刊：
Accelerators, Spectrometers, Detectors and Associated Equipment
影响因子：
--
作者：
Hall D
通讯作者：
Hall D