Optimization of low-cost CZT for nuclear imaging devices

核成像设备低成本 CZT 的优化

• 批准号: 6783734
• 负责人: Longxia Li
• 金额: $ 60.41万
• 依托单位: YINNEL TECH, INC.
• 依托单位国家: 美国
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-08-01 至 2007-03-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6783734
• 关键词: bioengineering /biomedical engineering; biomedical equipment development; biosensor device; biotechnology; clinical biomedical equipment; cost effectiveness; crystallization; monitoring device; nuclear medicine; radionuclide imaging /scanning; semiconduction; technology /technique development

DESCRIPTION (provided by applicant): Radionuclide imaging is an important tool for observing physiological processes within the brain and other organs. Traditional radionuclide imaging systems rely on scintillator-based detectors. Wide bandgap semiconductors such as cadmium zinc telluride (CZT) offer significant advantages over scintillator-based systems including superior energy and spatial resolution, compactness, and better signal to noise ratio. To date, most detector grade CZT is grown by the High Pressure Bridgman (HPB) technique in U.S.A. Detector grade material is costly because of low yields. Imarad (Israel) is making large-size CZT using low presure horizontal Bridgman technique with lower price, but the CZT with very low resistivity will increase the detector noice. The goal of the Phase II project is to optimize an alternative crystal growth method, the modified vertical Bridgman (MVB) technique, for growing larger size and lower cost CZT for nuclear imaging in united states. Thus, the specific aims of the Phase II research are: 1. Continue to optimize the growth of 3" diameter CZT ingots using MVB technique. 2. Construct a 4" diameter MVB furnace and use it to produce lager-size CZT wafers for imaging applications 3. Systematically characterize all MVB grown 3" and 4" diameter ingots to evaluate yields and provide feedback for Aim 1 and 2. 4. Develop the capability to prodcess CZT detectors including those with complex electrode geometries such as pixel arrays. This research will produce an important nuclear medicine imaging tool for bedside and will also monstrate the full potential of the new MVB CZT technique in nuclear medicine.

描述（由申请人提供）： 放射性核素成像是观察大脑和其他器官内生理过程的重要工具。传统的放射性核素成像系统依赖于基于闪烁体的探测器。与基于闪烁体的系统相比，诸如碲化镉锌 (CZT) 之类的宽带隙半导体具有显着的优势，包括卓越的能量和空间分辨率、紧凑性以及更好的信噪比。迄今为止，大多数探测器级 CZT 都是通过美国的高压布里奇曼 (HPB) 技术生长的。探测器级材料由于产量低而价格昂贵。 Imarad（以色列）正在利用低压水平布里奇曼技术制造大尺寸CZT，价格较低，但电阻率极低的CZT会增加探测器噪声。第二阶段项目的目标是优化替代晶体生长方法，即改进的垂直布里奇曼 (MVB) 技术，以在美国生长更大尺寸和更低成本的 CZT，用于核成像。因此，第二阶段研究的具体目标是： 1. 继续优化使用 MVB 技术生长 3" 直径 CZT 晶锭。 2. 建造一座4英寸直径的MVB炉，并用它生产用于成像应用的更大尺寸的CZT晶圆 3. 系统地表征所有 MVB 生长的 3" 和 4" 直径铸锭，以评估产量并为目标 1 和 2 提供反馈。 4. 开发生产 CZT 探测器的能力，包括具有复杂电极几何形状（例如像素阵列）的探测器。 这项研究将产生一种重要的床边核医学成像工具，也将展示新的 MVB CZT 技术在核医学中的全部潜力。