由c、b图可知,对于100psfwhm时间分辨率的结果,伪影、形变和其他性能的退化几乎全部消失,特别是在垂直于平板探测器方向上的图像误差,而且其效果好于环形pet对照组。 实施例2 平板pet设计与步骤不变,对照组条件也不变。 设置四个实验组,分别为时间分辨率为600ps,400ps、200ps、100ps。 设置病灶为六个热源。 重建结...
PETTime-of-flightCherenkov radiationSilicon photomultipliersLead fluorideAs previously demonstrated, an excellent timing resolution below 100ps FWHM is possible in time-of-flight positron emission tomography (TOF PET) if the detection method is based on the principle of detecting photons of Cherenkov ...
现有商业系统能够达到200ps的FWHM的重合时间分辨率(CTR),结合TOF(飞行时间)的图像重构,能够使图像PET图像的信噪比和灵敏度进一步提升。尽管如此,为了在低剂量放射性的儿科护理和神经退行性的疾病诸如阿兹海默中使用PET系统进行检测,未来的PET系统需要特别高的灵敏度因此也需要特别高的时间分辨率。这些目标可以通过提高时间分...
The renewed interest in BGO scintillators for TOF-PET is driven by the improved Cherenkov photon detection with new blue-sensitive SiPMs. However, the slower scintillation light from BGO causes significant time walk with leading edge discrimination (LED), which degrades the coincidence time resolution...
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本文以30-100ps的时间分辨率为目标,探讨TOF-PET的探测器设计和性能评估.从闪烁晶体和光检测器件出发,讨论了传统PET探测器的闪烁晶体部分的时间分辨率和能量分辨率,指出了传统设计的限制,试探性地给出了TOF-PET探测器闪烁晶体部分的方向.在前端电子电路部分,比较了传统的混合信号处理和全数字信号处理在时间分辨率和能量...
系统采集的角度出发,以优化现有系统的时间分辨性能与能量分辨性能为目的,分析TOF技术对前端电子系统的设计需求,并对其进行实施与测试.结果表明设计得到的全局时钟抖动小于10 ps;基于JESD204B协议的ADC采集方案可以使目前的PET系统能量分辨率低于12%;基于CFD和FPGA-TDC的时间测量技术可以使时间分辨率达到100 ps,满足系统...
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·有机材料的质量分辨率(m/Δm):PET(104 amu)在12000以上 ·最小离子束直径:70纳米(高空间分辨率模式)、0.5μm(高质量分辨率模式) nanoTOF II选配 串联质谱MS/MS、氩气团簇离子枪、C60离子枪、铯离子枪、氩/氧离子溅射枪、样品冷却/加热系统、样品高温加热系统、真空转移装置、氧喷射系统、Zalar高速旋转系统、...
Time of flight (TOF) measurements in positron emission tomography (PET) are very challenging in terms of timing performance, and should ideally achieve less than 100 ps FWHM precision. We present a time-based differential technique to read out silicon photomultipliers (SiPMs) which has less than ...