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首页> 外文期刊>Applied radiation and isotopes: including data, instrumentation and methods for use in agriculture, industry and medicine >Evaluation of dual gamma-ray imager with active collimator using various types of scintillators.
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Evaluation of dual gamma-ray imager with active collimator using various types of scintillators.

机译：使用各种类型的闪烁器评估带有主动准直器的双伽马射线成像仪。

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The performance of a specialized dual gamma-ray imager using both mechanical and electronic collimation was evaluated by Monte Carlo simulation (MCNP5). The dual imager consisted of an active collimator and a planar detector that were made from scintillators. The active collimator served not only as a coded aperture for mechanical collimation but also as a first detector for electronic collimation. Therefore, a single system contained both mechanical and electronic collimation. Various types of scintillators were tested and compared with each other in terms of their angular resolution, efficiency, and background noise. In general, a BGO active collimator had the best mechanical collimation performance, and an LaCl(Ce) active collimator provided the best electronic collimation performance. However, for low radiation energies, the mechanical collimation images made from both scintillators showed the same quality, and, for high radiation energies, electronic collimation images made from both scintillators also show similar quality. Therefore, if mechanical collimation is used to detect low-energy radiation and electronic collimation is applied to reconstruct a high-energy source, either LaCl(Ce) or BGO would be appropriate for the active collimator of a dual gamma-ray imager. These results broaden the choice of scintillators for the active collimator of the dual gamma-ray imager, which makes it possible to consider other factors, such as machinability and cost, in making the imager. As a planar detector, BGO showed better performance than other scintillators since its radiation detection efficiency was highest of all.
机译：通过蒙特卡洛模拟（MCNP5）评估了使用机械和电子准直的专用双伽马射线成像仪的性能。双成像仪由有源准直仪和由闪烁体制成的平面探测器组成。有源准直仪不仅用作机械准直的编码孔径，而且还用作电子准直的第一个检测器。因此，一个系统同时包含机械和电子准直。测试了各种类型的闪烁体，并就其角分辨率，效率和背景噪声进行了比较。通常，BGO主动准直仪具有最佳的机械准直性能，而LaCl（Ce）主动准直仪则具有最佳的电子准直性能。然而，对于低辐射能量，由两个闪烁体制成的机械准直图像显示相同的质量，而对于高辐射能量，由两个闪烁体制成的电子准直图像也显示相似的质量。因此，如果使用机械准直仪检测低能辐射，并应用电子准直仪来重构高能源，则LaCl（Ce）或BGO都适合于双伽马射线成像仪的有源准直仪。这些结果为双伽马射线成像仪的有源准直器扩大了闪烁器的选择范围，这使得在制造成像仪时可以考虑其他因素，例如可加工性和成本。作为平面探测器，BGO的辐射探测效率最高，因此比其他闪烁体具有更好的性能。

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