Instituto de Física Corpuscular (IFIC-CSIC/UVEG), Valencia, Spain.
Phys Med Biol. 2010 Dec 7;55(23):7299-315. doi: 10.1088/0031-9155/55/23/008. Epub 2010 Nov 16.
The characterization of a PET detector head based on continuous LYSO crystals and silicon photomultiplier (SiPM) arrays as photodetectors has been carried out for its use in the development of a small animal PET prototype. The detector heads are composed of a continuous crystal and a SiPM matrix with 64 pixels in a common substrate, fabricated specifically for this project. Three crystals of 12 mm × 12 mm × 5 mm size with different types of painting have been tested: white, black and black on the sides but white on the back of the crystal. The best energy resolution, obtained with the white crystal, is 16% FWHM. The detector response is linear up to 1275 keV. Tests with different position determination algorithms have been carried out with the three crystals. The spatial resolution obtained with the center of gravity algorithm is around 0.9 mm FWHM for the three crystals. As expected, the use of this algorithm results in the displacement of the reconstructed position toward the center of the crystal, more pronounced in the case of the white crystal. A maximum likelihood algorithm has been tested that can reconstruct correctly the interaction position of the photons also in the case of the white crystal.
已经对基于连续 LYSO 晶体和硅光电倍增管 (SiPM) 阵列的 PET 探测器头进行了特性描述，将其用于开发小型动物 PET 原型。探测器头由一个连续的晶体和一个 SiPM 矩阵组成，在一个共同的衬底上有 64 个像素，是专门为这个项目制造的。已经测试了三种具有不同涂漆类型的 12mm×12mm×5mm 尺寸的晶体：白色、黑色和晶体背面为白色但侧面为黑色。用白色晶体获得的最佳能量分辨率为 16% FWHM。探测器响应在 1275keV 以下是线性的。已经对三种晶体进行了不同的位置确定算法测试。使用重心算法获得的空间分辨率对于三种晶体约为 0.9mm FWHM。正如预期的那样，该算法会导致重建位置向晶体中心的位移，在白色晶体的情况下更为明显。已经测试了一种最大似然算法，即使在白色晶体的情况下，它也可以正确重建光子的相互作用位置。
