Optimization of low-cost CZT for nuclear imaging devices

核成像设备低成本 CZT 的优化

• 批准号: 7045953
• 负责人: Longxia Li
• 金额: $ 53.5万
• 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 2007-12-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7045953
• 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器的探测器。宽带隙半导体，如碲锌镉（CZT），提供了显着的优势，包括上级的能量和空间分辨率，紧凑性，更好的信号噪声比基于斩波器的系统。迄今为止，大多数探测器级CZT是在美国通过高压布里奇曼（HPB）技术生长的。探测器级材料由于产率低而昂贵。以色列Imarad公司采用低压水平布里奇曼技术制造大尺寸CZT，价格较低，但电阻率很低的CZT会增加探测器的噪声。第二阶段项目的目标是优化一种替代晶体生长方法，即改进的垂直布里奇曼（MVB）技术，用于在美国生长用于核成像的更大尺寸和更低成本的CZT。因此，第二阶段研究的具体目标是： 1.继续使用MVB技术优化3”直径CZT锭的生长。 2.建造一个4”直径的MVB炉，并使用它来生产用于成像应用的较大尺寸的CZT晶片 3.系统地表征所有MVB生长的3”和4”直径晶锭，以评估产率并为目标1和目标2提供反馈。 4.开发CZT探测器的加工能力，包括具有复杂电极几何形状（如像素阵列）的探测器。 这项研究将产生一个重要的床旁核医学成像工具，也将展示新的MVB CZT技术在核医学中的全部潜力。