Ultra-precise surface processing of LYSO scintillator crystals for Positron Emission Tomography.
Ultra-precise surface processing of LYSO scintillator crystals for Positron Emission Tomography.
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DOI：
10.1016/j.apsusc.2018.11.024
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发表时间：
2019-03-01
影响因子：
6.7
通讯作者：
Xu J
中科院分区：
文献类型：
--
作者：
Xie S;Sun Q;Ying G;Guo L;Huang Q;Peng Q;Xu J
正硅酸镥钇（LYSO）是高性能正电子发射断层扫描（PET）系统中应用最广泛的闪烁晶体之一。LYSO表面光洁度的质量对PET探测器和系统的光输出、解码性能、能量分辨率和时间分辨率有重要影响。本文提出了一种超精密加工LYSO晶体表面的方法。首先使用纳米压痕技术测量晶体的硬度和弹性模量。将闪烁体以稀疏、密集和连续的排列固定在板上，并使用具有不同尺寸颗粒的氧化铝（Al 2 O3）和氧化铈（CeO 2）抛光溶液进行抛光。采用磁流变抛光技术对LYSO晶体进行抛光。这里的抛光液包括羟基铁粉和硬磨料。晶体的硬度和弹性模量分别为11.18 ± 0.50和155.78 ± 4GPa。使用3D光学表面轮廓仪（3D-OPS）和原子力显微镜（AFM）来评估抛光表面的质量。通过3D-OPS测量的平均粗糙度为Ra 0.55 nm，使用精确的板研磨和抛光技术实现。磁流变抛光方法也获得了优异的粗糙度Ra 0.75 nm（3D-OPS）。我们使用这些处理技术的报告可以作为进一步深入研究闪烁体表面处理的最佳技术的基础。
The Lutetium-Yttrium Oxyorthosilicate (LYSO) is one of the most widely used scintillation crystal in the high-performance Positron Emission Tomography (PET) systems. The quality of the surface finish of the LYSO has an important impact on the light output, the decoding performance, the energy resolution and timing resolution of the PET detectors and systems. In this paper, we present an ultra-precise method for processing the surface of LYSO crystals. The hardness and elastic modulus of the crystals were initially measured using Nano indentation technology. The scintillators were fixed onto the plate in sparse, serried and continuous arrangements and polished using an alumina (Al2O3) and cerium oxide (CeO2) polishing solution with particles of varying size. We used a magnetorheological-polishing technique to polish the LYSO crystals. The polishing solution here included hydroxyl iron powder and hard abrasives. The hardness and elastic modulus of the crystals in question was, respectively, 11.18 ± 0.50 and 155.78 ± 4gigapascals (GPa). A 3D optical surface profiler (3D-OPS) and an atomic force microscope (AFM) were used to evaluate the quality of the polished surfaces. The average roughness of Ra 0.55 nm measured by 3D-OPS was achieved using a precise plate grinding and polishing technique. The magnetorheological-polishing method also obtained an excellent roughness of Ra 0.75 nm (3D-OPS). Our report of the use of these processing technologies can serve as a foundation for further in-depth research regarding the optimal techniques for scintillator surface processing.
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影响因子：
1.8
作者：
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通讯作者：
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DOI：
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