New Multi-Channel ASIC and Si Detector for Gamma Cameras

适用于伽玛相机的新型多通道 ASIC 和 Si 探测器

• 批准号: 6737047
• 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: 2004-02-04 至 2005-01-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6737047
• 关键词: bioengineering /biomedical engineering; biomedical equipment development; gamma radiation; microprocessor /microchip; scintillation cameras

DESCRIPTION (provided by applicant): We will develop a novel detector modules for a new class of solid state gamma cameras, offering superior performance compared with currently available systems, which will be capable of excellent energy resolution, good sensitivity down to 27 keV for small animal imaging applications and also the ability to clearly separate closely spaced higher energy gamma-rays for dual-isotope imaging applications. This new gamma camera technology will be based on Photon Imaging's new silicon photodiodes and a new low noise multi-channel ASIC (application specific integrated circuit), recently developed by scientists at the Brookhaven National Laboratory (BNL). The BNL ASIC is particularly well suited for this application due to its low noise, charge sensitive preamplifier, and peaking time regime. In addition, other chip specifications are ideally matched to the silicon photodiode. Improvements in the overall noise system level, and the ability to fabricate large area arrays using the relatively inexpensive technology afforded by the silicon ASIC and silicon photodiodes, will result in robust gamma cameras with improved energy resolution and improved sensitivity. Improved energy resolution will lead directly to higher sensitivity, better contrast, improved spatial resolution and the capability to perform quantification of SPECT images. In Phase I, Photon Imaging will work closely with BNL staff to evaluate the existing ASIC performance in conjunction with new silicon photodiodes that Photon has been developing for coupling with CsI(TI) scintillator arrays. Several channels will be characterized in response to gamma radiation from radioisotope sources. Full energy spectra will be collected per channel. Modifications for the chip will be proposed for optimum performance in medical imaging applications. In Phase II, the chip will be modified to optimize the chip with respect to shaping time, analog outputs, gain and other parameters based on the Phase I evaluation. Phase II will include design, fabrication and characterization of the modified ASIC, and full fabrication of a prototype detector array comprised of a 16x16 array for 256-channels of readout. The prototype detector array will be evaluated with radioisotope sources and medical imaging phantoms.

描述（由申请人提供）：