双门输入接收器 FPGA-only信号数字化方法用于飞行时间正子辐射断层扫描
Guen Bae Ko1,2, Jae Sung Lee1,2,3,4
1Brightonix Imaging Inc., Seoul, 04782 South Korea.
Biomedical engineering letters
|July 1, 2024
概括
本研究介绍了一种高效的现场可编程门阵列 (FPGA) - 仅为数字化器用于基于光倍增器 (SiPM) 的飞行时间正子发射断层扫描 (TOF PET) 系统. 新的双值电压比较器方法减少了先进的PET数据采集的复杂性和成本.
科学领域:
- 医疗成像医学成像
- 仪器化 仪器化 仪器化
- 核物理 核物理 核物理
背景情况:
- 基于光倍增器 (SiPM) 的飞行时间正子辐射断层扫描 (TOF PET) 系统需要先进的数据采集 (DAQ) 系统.
- 只有现场可编程门阵列 (FPGA) 信号数字化是这些DAQ系统的一个有希望的解决方案.
研究的目的:
- 为TOF PET DAQ系统提出并实施一个高效的FPGA-only数字化器.
- 为了减少PET DAQ系统的路由复杂性和制造成本.
主要方法:
- 配置FPGA输入/输出 (IO) 端口作为使用被动电路和异质IO标准的双值电压比较器.
- 集成了双值比较器与基于FPGA的时间到数字转换器.
- 采用双门时间超过门 (TOT) 方法结合曲线拟合用于能源信息提取.
主要成果:
- 使用3x3x20mm3的LYSO晶体和单个像素SiPM,实现了12.5%的能量分辨率和146±9秒的时间分辨率.
- 在100-600 keV的能量范围内证明了双值TOT方法的一致线性.
- 成功实施了一种只使用FPGA的数字化器,降低了复杂性和成本.
结论:
- 拟议的只有FPGA的数字化器与双门电压比较器是高集成TOF PET系统的成本效益解决方案.
- 这种方法可实现精确的能量和时间测量,这对于先进的PET成像至关重要.
- 该方法为开发下一代PET DAQ系统提供了一条实用的途径.
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