A proper choice of the scintillation crystal can considerably improve the detector performance in nuclear medicine imaging. In this study two promising crystals, CRY018 and CRY019, are characterized in terms of spectrometric and imaging capabilities. Thanks to the same irradiation conditions, it has been possible to compare their performance for a wide range of energies (30 keV to 662 keV) . They have high energy resolution (6.5% and 7.6% at 662 keV for CRY018 and CRY019, respectively), negligible light yield non-proportionality, good position linearity, and intrinsic spatial resolution less than 2 mm. In particular, the performance deviations could be explained from the different attenuation length (CRY018 depth of interaction is higher than CRY019 one, due to their different density).

中文翻译：

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成像性能取决于晶体吸收性能：CRY018和CRY019的比较

闪烁晶体的适当选择能显着改进在核医学成像的检测器的性能。在这项研究中，两个有前途的晶体CRY018和CRY019在光谱和成像能力方面得到了表征。由于相同的辐照条件，有可能比较它们在宽范围能量（30 keV至662 keV）下的性能。它们具有很高的能量分辨率（对于CRY018和CRY019，在662 keV时分别为6.5％和7.6％），可忽略的光输出非比例性，良好的位置线性和小于2 mm的固有空间分辨率。特别是，性能差异可以用不同的衰减长度来解释（由于其密度不同，相互作用的CRY018深度要比CRY019更高）。