New Planar APD for PET Applications

适用于 PET 应用的新型平面 APD

• 批准号: 6833179
• 负责人: Carolyn Rossington Tull
• 金额: $ 10万
• 依托单位: PHOTON IMAGING, INC.
• 依托单位国家: 美国
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-07-01 至 2005-06-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6833179
• 关键词: bioengineering /biomedical engineering; bioimaging /biomedical imaging; biomedical equipment development; breast neoplasms; clinical biomedical equipment; computer simulation; light emission; mammary gland; neoplasm /cancer radiodiagnosis; positron emission tomography; radiation detector; semiconduction

DESCRIPTION (provided by applicant): We propose to develop a new type of solid-state photodetector, namely the Planar Avalanche Photodiode (PAPD), to replace photomultiplier tubes (PMT) in positron emission tomography (PET) detector modules for breast imaging. Solid-state devices offer significant improvements in performance and cost compared to the PMTs, and also can be operated in magnetic fields, which opens up the additional possibility of dual-modality PET/MRI types of imaging instruments. This new avalanche photodiode (APD) design is expected to be much more reliable, robust and lower cost to produce than the current commercially available APDs. In addition, and perhaps more importantly, the new design allows for easy implementation of large area arrays, unlike other current APDs that are being developed for PMT replacements. The new PAPD design will be based on experience we have accumulated over several years in the design and fabrication of standard silicon p-i-n photodiodes, beveled-edge APDs, and silicon drift photodiodes. In Phase I, we will develop the prototype PAPD detector, which will include computer simulations of the design, design of photomasks and process sequence, fabrication and testing of the PAPDs. The testing of the PAPDs will include dark current, response to light from light emitting diodes, quantum efficiency, gain measurements, and response to gamma radiation when coupled to scintillators. Phase I results will show the feasibility of the new design as applied towards larger area arrays for PET detector modules. In Phase II, we will optimize the PAPD design based on the Phase I results. 8x8 arrays of the PAPDs will be fabricated and tested. Two complete detector modules, based on 8x8 arrays of PAPDs, coupled to 8x8 arrays of LSO scintillators, will be assembled with full readout electronics and software. The detector modules will be characterized and tested with respect to energy resolution and timing in response to gammaradiation. Full evaluation as prototype PET detector modules will be performed in collaboration with our colleagues at UCLA in their PET test setup.

描述（由申请人提供）： 我们建议开发一种新型的固态光电探测器，即平面雪崩光电二极管（PAPD），以取代光电倍增管（PMT）的正电子发射断层扫描（PET）探测器模块乳腺成像。与光电倍增管相比，固态设备在性能和成本方面有了显着改进，并且还可以在磁场中操作，这为双模态PET/MRI类型的成像仪器提供了额外的可能性。这种新的雪崩光电二极管（APD）设计预计比目前市售的APD更可靠，更坚固，生产成本更低。此外，也许更重要的是，新的设计允许轻松实现大面积阵列，不像其他目前正在开发的PMT替代APD。 新的PAPD设计将基于我们多年来在标准硅p-i-n光电二极管、斜边APD和硅漂移光电二极管的设计和制造方面积累的经验。在第一阶段，我们会研制PAPD探测器的原型，包括计算机模拟PAPD的设计、光掩模设计、工艺流程、制造和测试。PAPD的测试将包括暗电流、对发光二极管发出的光的响应、量子效率、增益测量以及耦合到闪烁器时对伽马辐射的响应。第一阶段的结果将显示适用于PET探测器模块的更大面积阵列的新设计的可行性。 在第二阶段，我们将根据第一阶段的结果优化PAPD设计。将制造和测试8x8阵列的PAPD。两个完整的探测器模块，基于8 × 8阵列的PAPD，耦合到8 × 8阵列的LSO振荡器，将与完整的读出电子和软件组装。将对探测器模块的能量分辨率和伽马辐射响应时间进行表征和测试。将与我们在UCLA的同事在他们的PET测试设置中合作，对原型PET探测器模块进行全面评估。