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XEMIS: A new Compton camera with liquid xenon

机译:XEMIS:带有液体氙气的新型康普顿相机

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摘要

In the context of medical imaging system, we develop an innovative technique, called 3 gamma. It consists in a direct 3D reconstruction of each decays of 44Sc radionuclide with a resolution below the centimeter. This breakthrough in instrumentation technique is only possible by the use of a new detection medium (liquid xenon) and a new detection structure compared with conventional imaging technique. Thanks to an ultra-low noise front-end electronics (below 100 electrons ENC) operating at liquid xenon temperature and a fast UV sensitive PMT, high spatial resolution and high energy resolution are achievable in 3D. This is particularly important for Compton imaging since all interactions in the medium have to be identified to derive the incoming gamma ray direction. A prototype (XEMIS1) is now in test at Subatech and shows promising results. We achieve an energy resolution of 8.9 % (FWHM) at 1.2 MeV with an electric field of 1kV/cm. All the cryogenic system is fully operational with a high purification rate and shows a very good stability. I will review all these aspects and introduce the next step of the project, XEMIS2, a larger prototype dedicated to the 3 gamma imaging of small animals.
机译:在医学成像系统的背景下,我们开发了一种称为3 gamma的创新技术。它包括对44Sc放射性核素的每个衰变进行直接3D重建,其分辨率低于厘米。与传统的成像技术相比,只有通过使用新的检测介质(液态氙)和新的检测结构,才能实现仪器技术的突破。得益于在液氙温度下运行的超低噪声前端电子设备(低于100个电子ENC)和快速的对紫外线敏感的PMT,可以在3D中实现高空间分辨率和高能量分辨率。这对于康普顿成像特别重要,因为必须识别介质中的所有相互作用才能得出入射的伽马射线方向。原型(XEMIS1)现在正在Subatech进行测试,并显示出令人鼓舞的结果。在1kV / cm的电场下,我们在1.2 MeV下实现了8.9%(FWHM)的能量分辨率。所有低温系统都可以高纯度完全运行,并且显示出非常好的稳定性。我将回顾所有这些方面,并介绍该项目的下一步,即XEMIS2,这是一个专门用于小动物3伽玛成像的大型原型。

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